MP Board of Secondary Education (MPBSE) has been proactive in designing the syllabus of Class 10 Mathematics subject each year to make sure the students get a better understanding of the subject and...

### Uttarakhand Board Class 12 Biology Syllabus

Uttarakhand Board of School Education (UKBSE) has prepared a detailed syllabus for Class 12 Biology exam of 2021-22. The syllabus is comprehensive and has been designed in such a manner that it...

### Uttarakhand Board Class 12 Maths Syllabus

Uttarakhand Board of School Education (UKBSE) has come up with a restructured and comprehensive syllabus for Class 12 Maths. The syllabus of the subject has been designed keeping in mind the future...

### Uttarakhand Board Class 12 Chemistry Syllabus

Uttarakhand Board of School Education (UKBSE) has prepared a detailed syllabus for Class 12 Chemistry for the board exam of 2021-22. The new syllabus aims to help students become better in...

### Uttarakhand Board Class 12 Physics Syllabus

The Uttarakhand Board of School Education (UKBSE) has been regularly updating the syllabus of all the subjects in Class 12 as it is considered the turning point in a student’s academic career....

### Uttarakhand Board Class 11 Biology Syllabus

Uttarakhand Board of School Education (UKBSE) has prepared a comprehensive syllabus for Class 11 Biology for the board exam of 2021-22. It is a must that students study and analyze the syllabus...

### Uttarakhand Board Class 11 Maths Syllabus

Uttarakhand Board of School Education (UKBSE) designs the detailed syllabus of Class 11 Mathematics subject. The board conducts an annual exam for this subject consisting of a theory paper and a...

### Uttarakhand Board Class 11 Chemistry Syllabus

Uttarakhand Board of School Education (UKBSE) has prepared a comprehensive syllabus for Class 11 Chemistry for the board exam of 2021-22. It is a must that students closely analyze the syllabus...

### Uttarakhand Board Class 11 Physics Syllabus

Uttarakhand Board of School Education (UKBSE) has prescribed an updated syllabus which has undergone drastic changes keeping in mind the changing times. UKBSE has been proactive in structuring the...

### Uttarakhand Board Class 10 Maths Syllabus

Uttarakhand Board of School Education (UKBSE) has been proactive in designing the syllabus of Class 10 Mathematics subject each year to make sure the students get a better understanding of the...

### Uttarakhand Board Class 10 Science Syllabus

Uttarakhand Board of School Education (UKBSE) has been regularly updating the syllabus of all the subjects in Class 10 as it is considered a crucial phase in a student’s academic career. Sincere and...

### Chhattisgarh Board Class 12 Biology Syllabus

CGBSE (Chhattisgarh Board of Secondary Education) has prepared a detailed syllabus for Class 12 Biology exam of 2021-22. The syllabus is comprehensive and has been designed in such a manner that it...

### Chhattisgarh Board Class 12 Maths Syllabus

CGBSE (Chhattisgarh Board of Secondary Education) has come up with a restructured and comprehensive syllabus for Class 12 Maths. The syllabus of the subject has been designed keeping in mind the...

### Chhattisgarh Board Class 12 Chemistry Syllabus

Chhattisgarh Board of Secondary Education (CGBSE) has prepared a detailed syllabus for Class 12 Chemistry for the board exam of 2021-22. The new syllabus aims to help students become better in...

### Chhattisgarh Board Class 12 Physics Syllabus

Chhattisgarh Board of Secondary Education (CGBSE) has been regularly updating the syllabus of all the subjects in Class 12 as it is considered the turning point in a student’s academic career....

### Chhattisgarh Board Class 11 Biology Syllabus

CGBSE (Chhattisgarh Board of Secondary Education) has prepared a comprehensive syllabus for Class 11 Biology for the board exam of 2021-22. It is a must that students study and analyze the syllabus...

### Chhattisgarh Board Class 11 Maths Syllabus

Chhattisgarh Board of Secondary Education (CGBSE) designs the detailed syllabus of Class 11 Mathematics subject. The board conducts an annual exam for this subject consisting of a theory paper and a...

### Chhattisgarh Board Class 11 Chemistry Syllabus

Chhattisgarh Board of Secondary Education (CGBSE) has prepared a comprehensive syllabus for Class 11 Chemistry for the board exam of 2021-22. It is important that students closely analyze the...

### Chhattisgarh Board Class 11 Physics

Chhattisgarh Board of Secondary Education (CGBSE) has been undergoing drastic changes keeping in mind the changing times. The syllabus prescribed by the board has been in line with the modern...

### Chhattisgarh Board Class 10 Science Syllabus

Chhattisgarh Board of Secondary Education (CGBSE) has been regularly updating the syllabus of all the subjects in Class 10 as it is considered a crucial phase in a student’s academic career....

### Chhattisgarh Board Class 10 Maths

Chhattisgarh Board of Secondary Education (CGBSE) has been making drastic changes in the syllabus of various subjects keeping in mind the changing times. CGBSE has been proactive in structuring the...

### Bihar Board Class 12 Biology Syllabus

Bihar School Examination Board (BSEB) has prepared a detailed syllabus for Class 12 Biology exam of 2021-22. The syllabus is comprehensive and has been designed in such a manner that it helps...

### Bihar Board Class 12 Maths Syllabus

Bihar School Examination Board (BSEB) has come up with a restructured and comprehensive syllabus for Class 12 Maths. The syllabus of the subject has been designed keeping in mind the future academic...

### Bihar Board Class 12 Chemistry Syllabus

Bihar School Examination Board (BSEB) has prepared a detailed syllabus for Class 12 Chemistry for the board exam of 2021-22. The new syllabus aims to help students become better in understanding the...

### Bihar Board Class 12 Physics Syllabus

Bihar School Examination Board (BSEB) has been regularly updating the syllabus of all the subjects in Class 12 as it is considered the turning point in a student’s academic career. Sincere and...

### Bihar Board Class 11 Biology Syllabus

Bihar School Examination Board (BSEB) has prepared a comprehensive syllabus for Class 11 Biology for the board exam of 2021-22. It is a must that students analyze and clarify the doubts regarding...

### Bihar Board Class 11 Maths Syllabus

Bihar School Examination Board (BSEB) designs the detailed syllabus of Class 11 Mathematics subject. The board conducts an annual exam for this subject consisting of a theory paper and a practical...

### Bihar Board Class 11 Chemistry Syllabus

Bihar School Examination Board (BSEB) has prepared a comprehensive syllabus for Class 11 Chemistry for the board exam of 2021-22. It is a must that students study and analyze the syllabus before...

### Bihar Board Class 11 Physics Syllabus

Bihar School Examination Board (BSEB) has been regularly updating the syllabus of all the subjects in Class 11 as it is considered a crucial phase in a student’s academic career. Sincere and...

### Bihar Board Class 10 Science Syllabus

Bihar School Examination Board (BSEB) has been regularly updating the syllabus of all the subjects in Class 10 as it is considered a crucial phase in a student’s academic career. Sincere and...

### Bihar Board Class 10 Maths Syllabus

Bihar School Examination Board (BSEB) has been proactive in designing the syllabus of Class 10 Mathematics subject each year to make sure the students get a better understanding of the subject and...

### Haryana Board Class 12 Biology Syllabus

Haryana Board of School Education (HBSE Board) has prepared a detailed syllabus for Class 12 Biology exam of 2021-22. The syllabus is comprehensive and has been designed in such a manner that it...

### Haryana Board Class 12 Maths Syllabus

HBSE (Haryana Board of School Education) has come up with a restructured and comprehensive syllabus for Class 12 Maths. The syllabus of the subject has been designed keeping in mind the future...

### Haryana Board Class 12 Chemistry Syllabus

Haryana Board of School Education (HBSE) has prepared a detailed syllabus for Class 12 Chemistry for the board exam of 2021-22. The new syllabus aims to help students become better in...

### Haryana Board Class 12 Physics Syllabus

Haryana Board of School Education (HBSE) has been regularly updating the syllabus of all the subjects in Class 12 as it is considered the turning point in a student’s academic career. Sincere and...

### Haryana Board Class 11 Biology Syllabus

Haryana Board of Secondary Education (the HBSE) has prepared a comprehensive syllabus for Class 11 Biology for the board exam of 2021-22. It is a must that students study and analyze the syllabus...

### Haryana Board Class 11 Maths Syllabus

Haryana Board of School Education (HBSE) designs the detailed syllabus of Class 11 Mathematics subject. The board conducts an annual exam for this subject consisting of a theory paper and a...

### Haryana Board Class 11 Chemistry

Haryana Board of School Education (HBSE) has prepared a comprehensive syllabus for Class 11 Chemistry for the board exam of 2021-22. It is a must that students closely analyze the syllabus before...

### Haryana Board Class 10 Science Syllabus

Haryana Board of School Education (HBSE) has been regularly updating the syllabus of all the subjects in Class 10 as it is considered a crucial phase in a student’s academic career. Sincere and...

### Rajasthan Board Class 12 Maths Syllabus

The RBSE (Rajasthan Board of Secondary Education) has come up with a restructured and comprehensive syllabus for Class 12 Maths. The syllabus of the subject has been designed keeping in mind the...

### Rajasthan Board Class 11 Maths Syllabus

Rajasthan Board (RBSE) designs the detailed syllabus of Class 11 Mathematics subject. The board conducts an annual exam for this subject consisting of a theory paper and a practical exam or viva....

### Rajasthan Board Class 12 Physics Syllabus

The Rajasthan Board of Secondary Education (RBSE) has been regularly updating the syllabus of all the subjects in Class 12 as it is considered the turning point in a student’s academic career....

### Rajasthan Board Class 12 Chemistry Syllabus

Rajasthan Board of Secondary Education (RBSE) has prepared a detailed syllabus for Class 12 Chemistry for the board exam of 2021-22. The new syllabus aims to help students become better in...

### Rajasthan Board Class 11 Biology Syllabus

Rajasthan Board of Secondary Education (the RBSE) has prepared a comprehensive syllabus for Class 11 Biology for the board exam of 2021-22. It is a must that students study and analyze the syllabus...

### Rajasthan Board Class 11 Chemistry Syllabus

Jharkhand Board (the Jharkhand Academic Council) has prepared a comprehensive syllabus for Class 11 Chemistry for the board exam of 2021-22. It is a must that students study and analyze the syllabus...

### Rajasthan Board Class 11 Physics Syllabus

Rajasthan Board of Secondary Education (RBSE) was established in the year 1957. The syllabus prescribed by the board has undergone drastic changes keeping in mind the changing times. RBSE has...

### Rajasthan Board Class 10 Science Syllabus

The RBSE (Rajasthan Board of Secondary Education) has been regularly updating the syllabus of all the subjects in Class 10 as it is considered a crucial phase in a student's academic career. Sincere...

### Rajasthan Board Class 10 Maths Syllabus

Rajasthan Board of Secondary Education (RBSE) was established in the year 1957. The syllabus prescribed by the board has undergone drastic changes keeping in mind the changing times. RBSE has been...

### Jharkhand Board Class 12 Biology Syllabus

The Jharkhand Academic Council (JAC Board) has prepared a detailed syllabus for Class 12 Biology exam of 2021-22. The syllabus is comprehensive and has been designed in such a manner that it helps...

### Jharkhand Board Class 12 Maths Syllabus

The JAC Board (Jharkhand Academic Council) has come up with a restructured and comprehensive syllabus for Class 12 Maths. The syllabus of the subject has been designed keeping in mind the future...

### Jharkhand Board Class 12 Chemistry Syllabus

The Jharkhand Academic Council (JAC Board) has prepared a detailed syllabus for Class 12 Chemistry for the board exam of 2021-22. The new syllabus aims to help students become better in...

### Jharkhand Board Class 12 Physics Syllabus

The Jharkhand Academic Council (JAC Board) has been regularly updating the syllabus of all the subjects in Class 12 as it is considered the turning point in a student’s academic career. Sincere and...

### Jharkhand Board Class 11 Maths Syllabus

Jharkhand Board (Jharkhand Academic Council) designs the detailed syllabus of Class 11 Mathematics subject. The board conducts an annual exam for this subject consisting of a theory paper and a...

### Jharkhand Board Class 11 Biology Syllabus

Jharkhand Board (the Jharkhand Academic Council) has prepared a comprehensive syllabus for Class 11 Biology for the board exam of 2021-22. It is a must that students study and analyze the syllabus...

### Jharkhand Board Class 11 Chemistry Syllabus

Jharkhand Board (the Jharkhand Academic Council) has prepared a comprehensive syllabus for Class 11 Chemistry for the board exam of 2021-22. It is a must that students study and analyze the syllabus...

### Jharkhand Board Class 10 Maths Syllabus

The Jharkhand Academic Council (JAC Board) has been proactive in designing the syllabus of Class 10 Mathematics subject each year to make sure the students get a better understanding of the subject...

### Jharkhand Board Class 11 Physics Syllabus

The Jharkhand Academic Council (JAC Board) has been regularly updating the syllabus of all the subjects in Class 11 as it is considered a crucial phase in a student's academic career. Sincere and...

### Jharkhand Board Class 10 Science Syllabus

The Jharkhand Academic Council (JAC Board) has been regularly updating the syllabus of all the subjects in Class 10 as it is considered a crucial phase in a student’s academic career. Sincere and...

### How to prepare for a Viva

How to prepare for a Viva : We all agree that exams can be scary and stressful for most of us, especially the external Viva examinations! To help ease your stress, we at Noon, wish to take you...

### State the role of silica in the metallurgy of copper.

$$ \begin{array}{l} \hline \mathrm{FeO}+\mathrm{C} \longrightarrow \mathrm{Fe}+\mathrm{CO} \\ \mathrm{CaCO}_{3} \stackrel{\Delta}{\longrightarrow} \mathrm{CaO}+\mathrm{CO}_{2} \\...

### Define the term solution. How many types of solutions are formed? Write briefly about each type with an example.

Solution: A Solution is a homogeneous mixture of two or more chemically non-reacting substances. Types of solution: There are nine types of solution. Types of Solution Examples Gaseous solutions:...

### Define F-centre. Mention its one consequence.

Ans: One or more unpaired electrons occupy an anionic vacancy in a crystal in a crystallographic defect known as an F-center. FARBE center, or color center (from the German Farbzentrum). Vacancies...

### What is the coordination number for (a) An octahedral void Ans: The coordination number for an octahedral void will be (b) A tetrahedral void Ans: The coordination number for a tetrahedral void will be

(a) An octahedral void Ans: The coordination number for an octahedral void will be $6 .$ (b) A tetrahedral void Ans: The coordination number for a tetrahedral void will be $4 .$

### Find the value of so that is a factor of .Find the value of so that is a factor of .

Ans: $$ \begin{array}{l} \text { Let } P(x)=k^{2} x^{2}-2 k x-3 \\ P(1)=k^{2}(1)^{2}-2 k(1)-3 \\ \Rightarrow 0=k^{2}-2 k-3 \\ \Rightarrow k^{2}-3 k+k-3 \end{array}

### Find the sum of first hundred even natural numbers divisible by 5 .

Ans: Even natural no, divisible by 5 are $10,20,30, \ldots$ Here, $a=10, d=10, n=100$ Using the formula, $$ \begin{array}{l} S_{n}=\frac{n}{2}[2 a+(n-1) d] \\ S_{100}=\frac{100}{2}[2(10)+10(100-1)]...

### If there are terms in an AP, prove that the ratio of the sum of odd terms and the sum of even terms is

Ans: Use the formula $a_{n}=a+(n-1) d$, Sum of odd terms: $$ \begin{array}{l} s_{1}=a_{1}+a_{3}+\ldots \ldots a_{2 n+1} \\ s_{1}=\frac{n+1}{2}\left[2 a_{1}+2 n d\right] \\ \therefore s_{1}=(n+1)(a+n...

### Diagonals AC and BD of a trapezium ABCD with AB intersect each other at the point Using a similarity criterion for two triangles, show that

Solution: In $\Delta \mathrm{DOC}$ and $\triangle \mathrm{BOA}$ $\mathrm{AB} \| \mathrm{CD}$, thus alternate interior angles will be equal, $\therefore \angle \mathrm{CDO}=\angle \mathrm{ABO}$...

### By the method of completion of squares show that the equation has no real roots.

Ans: $$ \Rightarrow x^{2}+\frac{3}{4} x+\left(\frac{3}{8}\right)^{2}=-\frac{5}{4}+\frac{9}{64} $$ $\Rightarrow\left(x+\frac{3}{8}\right)^{2}=-\frac{71}{64}$ $\Rightarrow...

### Prove that the tangents drawn at the ends of a diameter of a circle are parallel.

Answer: First, draw a circle and connect two points $A$ and $B$ such that $A B$ becomes the diameter of the circle. Now, draw two tangents PQ and RS at points A and B respectively. Now, both radii...

### In figure. (i) and (ii), DE . Find EC in (i) and AD in (ii).

Solution: (i) Given, in $\triangle \mathrm{ABC}, \mathrm{DE} \| \mathrm{BC}$ $\therefore \mathrm{AD} / \mathrm{DB}=\mathrm{AE} / \mathrm{EC}$ [Using Basic proportionality theorem] $\Rightarrow 1.5 /...

### .If and be the inductance and resistance respectively then the dimensions of will be

i)

ii)

iii)

iv)

Correct option is A $\mathrm{M}^{\circ} \mathrm{L} \mathrm{T}$ We know that: Dimensional formula of $\mathrm{L}=\mathrm{ML}^{2} \mathrm{~T}^{-2} \mathrm{~A}^{-2}$ Dimensional formula for...

### Pressure-temperature relationship for an ideal gas undergoing adiabatic change is:

A constant

B constant

c constant

D constant

Correct option is D $\mathrm{P}^{1-\mathrm{T}^{7}}=$ constant From the first law of thermodynamics, $d U=d Q+d W$ But for adiabatic process, $\mathrm{dQ}=0$ $$ \begin{array}{l}...

Solution:- $\int \cos 2 x \cos 4 x \cos 6 x d x=\int \cos 2 x\left[\frac{1}{2}\{\cos (4 x+6 x)+\cos (4 x-6 x)\}\right] d x$ $=\frac{1}{2} \int\{\cos 2 x \cos 10 x+\cos 2 x \cos (-2 x)\} d x$ We know...

### Consider binary operation on defined as . Choose the correct answer.

both associative and commutative?

(B) Is commutative but not associative?

(C) Is associative but not commutative?

(D) Is neither commutative nor associative?

Solution: A binary operation $*$ on $N$ defined as $a * b=a^{3}+b^{3}$, Also, $a * b=a^{3}+b^{3}=b^{3}+a^{3}=b^{*} a$ The operation ${ }^{*}$ is commutative. Again, $(a * b)^{*}...

### If and are unit vectors such that , find the value of .

Solution: Consider the given vectors, Given, $\vec{a}+\vec{b}+\vec{c}=\overrightarrow{0}$. So, And, $$ \begin{array}{l} \vec{c} \cdot(\vec{a}+\vec{b}+\vec{c})=\vec{c} \cdot \overrightarrow{0} \\...

Solution: Let us take, $9-4 x^{2}=t$ We get, $-8 \mathrm{x} \mathrm{dx}=\mathrm{dt}$ Now take, $\int \frac{x}{9-4 x^{2}} d x$ https://byjus.com $B B Y J U^{\prime} S$ So, $$ =\frac{-1}{8}...

Solution: Given $$ \sin (a x+b) \cos (a x+b) $$ On integrating the above function, we get $$ \sin (a x+b) \cos (a x+b)=\frac{2 \sin (a x+b) \cos (a x+b)}{2} $$ We obtain, $$ =\frac{\sin 2(a x+b)}{2}...

### (a) Prove that Where is the equivalent. resistance of resistors and connected in series. (b) Prove that Where is the equivalent. resistance of resistors and connected in parallel.

### Which one of the following hologens is the strongest oxidising agent?

(A) I

(B)

(C) F

(D)

Correct option is C fluorine Florine is the most powerful oxidizing agent because it is the most electronegative element. Electronegative elements have the property to remove electrons form the...

### Solve the following linear programming problem : Maximize

subject to the constraints $x+y \leq 4$ $$ x \geq 0, y \geq 0 \text {. } $$ $$ x+y \leq 4 $$ Hence, $\mathrm{z}$ is maximum at $(0,4)$ and max value is 16

### The projection of the line on the plane is the line of intersection of this plane with the plane A B C D none of these

Correct option is A $2 x+y+2=0$ Equation of the plane through $(-1,0,1)$ is $a(x+1)+b(y-0)+c(z-1)=0$ which is parallel to the given line and perpendicular to the given plane $-\mathrm{a}+2...

### is equal to

(A)

(B)

(C)

(D)

The answer will be (A) $\frac{5 \pi}{6}$ Explanation: You can write $\frac{7 \pi}{6}$ as $\left(\pi+\frac{\pi}{6}\right)$ Thus we can clearly see the angle falls in the third quadrant. And the...

### The position vector of the point is

(A)

(B)

(C)

(D)

The correct answer is (D) $\vec{i}+2 \vec{k}$

### is a square matrix if

(A)

(B)

(C)

(D) none of these

Correct option is (A) None of these MatrixA $=\left[\mathrm{a}_{\mathrm{ij}}\right]_{\mathrm{m} \times \mathrm{n}}$ square matrix Number of columns $=$ number of rows $\mathrm{n}=\mathrm{m}$

### What are the direction cosines of the vector

Q. 1 Prove that i. $\left[\begin{array}{lll}\hat{\imath} & \hat{\jmath} & \hat{k}\end{array}\right]=\left[\begin{array}{lll}\hat{\jmath} & \hat{k} &...

### Describe various Cannabinoid drugs.

Solution: A type of chemical in marijuana that causes drug-like effects including the central nervous system and the immune system. Main active cannabinoid in marijuana is...

Answer Given equations: r¯=(ı^+ȷ^)+λ(2ı^-ȷ^+k^) \overline{\mathrm{r}}=(\hat{\imath}+\hat{\jmath})+\lambda(2 \hat{\imath}-\hat{\jmath}+\hat{\mathrm{k}})...

### Find the angle between each of the following pairs of lines:

To find – Angle between the two pair of lines Direction ratios of L1 = (1,0,3) Direction ratios of L2 = (-1,1,1) Tip – If (a,b,c) be the direction ratios of the first line and (a’,b’,c’) be that of...

### Differentiate between Homologous and Analogous organs.

Solution: HOMOLOGOUS ORGANS ANALOGOUS ORGANS 1. They differ morphologically. 1. They show a superficial resemblance. 2. They have a similar internal structure. 2. Their internal structure is...

### General formula of Alkene is

correct answer is option Alkenes are defined as either branched or unbranched hydrocarbons that possess at least one carbon–carbon double bond (CC) and have a general formula of CnH2n

### Diode is used as-

(A) An amplifier

(B) An 0scillator

(C) A modulator

(D) A rectifier

The correct option is (D) rectifier. Diode is a device which allows to pass a current only when it is forward biased. ... Hence it can be used as a rectifier.

### Draw a simplified model of the Phosphorus Cycle in a terrestrial ecosystem.

The biological membrane, nucleic acids, and cellular energy transmission system all contain phosphorus. Detritus is leaf litter and other organic debris that has been mixed with soil to form humus....

### Write truth table and Boolean expression of OR and AND get.

### Find the derivation of each of the following from the first principle: sin (2x + 3)

### Differentiate the following

### Define Coupling and Repulsion.

Solution: Coupling is the linkage of two dominant or two recessive alleles. Repulsion shows that dominant alleles are linked with recessive alleles.

### Draw a neat and well labelled diagram of transverse section of human ovary.

Solution:

### Prove the following

### Define Coupling and Repulsion.

Solution: Coupling is the linkage of two dominant or two recessive alleles. Repulsion shows that dominant alleles are linked with recessive alleles.

### Draw a neat and well labelled diagram of transverse section of human ovary.

Solution:

### find the value of n, for the following

To find: the value of n. We can write it as 3n2 + 7 × n - 370 = 0 Therefore n = 37/3, 10 Rejecting 37/3 we get n = 10

### In any ΔABC, prove that a

Similarly, b = 2R sinB and c = 2R sinC From Right hand side,

Answer

### In any ΔABC, prove that ac cos B – bc cos A = (a2 – b 2 )

Left hand side,

### Which term of the AP 64, 60, 56, 52, 48, …. is 0?

To Find: we need to find n when an = 0 Given: The series is 64, 60, 56, 52, 48, ... and an= 0 a1=64, a2= 60 and d=60–64 = –4 (Where a=a1 is first term, a2 is second term, an is nth term and d is...

### Find the first 5 terms of the sequence, defined by

To Find: First five terms of a given sequence. Condition: n ≥ 2 First five terms of a given sequence are -1,-12,-16,-124,-1120

### The length of the major axis of an ellipse is

units, and its foci are . Find the equation of the ellipse.

Let the equation of the required ellipse be Given: Length of Major Axis = \[20\] units …(i) We know that, Length of Major Axis = \[2a\] …(ii) ∴ From eq. (i) and (ii), we get...

### Opium is obtained from

(A)Papaver somniferum

(B) Frythroxylum coca

(C) Cannabis Sativa

(D) Atropa belladonna

(A)Papaver somniferum Opium contains two major groups of alkaloids. Morphin is the most common alkaloid found in opium. It is a narcotic drug derived from opium poppy seed pods. Diacetylmorphine is...

### Find the (iii) coordinates of the foci, (iv) eccentricity

Given: \[\frac{{{x}^{2}}}{49}+\frac{{{y}^{2}}}{36}=1\]…(i) Since, \[49\text{ }>\text{ }36\] So, above equation is of the form, \[\frac{{{x}^{2}}}{{{a}^{2}}}+\frac{{{y}^{2}}}{{{b}^{2}}}=1\] …(ii)...

### Find the (iii) coordinates of the foci, (iv) eccentricity

Given: \[\frac{{{x}^{2}}}{{{a}^{2}}}+\frac{{{y}^{2}}}{{{b}^{2}}}=1\]…(i) Since, \[25>9\] So, above equation is of the form, \[\frac{{{x}^{2}}}{{{a}^{2}}}+\frac{{{y}^{2}}}{{{b}^{2}}}=1\]…(ii)...

### Prove that:

Answer:

### In an equilateral triangle with side a, prove that area =

Answer: We know that the altitude of an equilateral triangle bisects the side on which it stands and forms right angled triangles with the remaining sides. ABC is an...

### In a single throw of two dice, find the probability of (ii)getting a doublet of odd numbers

(iii)getting the sum as a prime number

(iii)getting the sum as a prime number

Answer : (i) We know that, Probability of occurrence of an event (2, 1), (2, 2), (2, 3), (2, 4), (2, 5), (2, 6),Outcomes are (1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (1, 6), (3, 1), (3, 2), (3, 3),...

### Q4) Renin is secreted by the cells of _______. 1. JG apparatus 2. Collecting tubule 3. Collecting duct 4. PCT

Correct option- 1 Explanation: Renin is secreted by the JG apparatus found in the afferent arteriole. The secretion is mediated by the fusion of renin-containing granules with the luminal membrane...

### What is the role of pyridine in the acylation reaction of amines?

Solution: The activating effect of –NH2 group can be controlled by protecting the -NH2 group by acetylation with acetic anhydride in presence of pyridine and then carrying out the desired...

### Give the structure of ‘A’ in the following reaction.

Solution: The reaction involves the diazotization of the amine group.

### A vehicle travels half the distance L with speed V1 and the other half with speed V2, then its average speed is a) (V1+V2)/2 b) (2V1+V2)/(V1+V2) c) (2V1V2)/(V1+V2) d) L(V1+V2)/V1V2

The correct answer is c) (2V1V2)/(V1+V2)

### In one-dimensional motion, instantaneous speed v satisfies 0≤v

a) the displacement in time T must always take non-negative values b) the displacement x in time T satisfies: v0T<x<v0T c) the acceleration is always a non-negative number d) the motion has no...

### A lift is coming from 8th floor and is just about to reach 4th floor. Taking ground floor as origin and positive direction upwards for all quantities, which one of the following is correct? a) x<0, v<0, a>0 b) x>0, v<0, a<0 c) x>0, v<0, a>0 d) x>0, v>0, a<0

The correct answer is a) x<0, v<0, a<0 The value of x and v becomes negative as the lift is moving from the 8th floor to the 4th floor whereas acceleration is acting upwards and stays...

### The correct decreasing order of basic strength of the following species is _______. H2O, NH3, OH–, NH2–

(i) NH2– > OH – > NH3 > H2O

(ii) OH– > NH2– > H2O > NH3

(iii) NH3 > H2O > NH2– > OH–

(iv) H2O > NH3> OH– > NH2–

Solution: Option (i) is the answer. Reason: NH3 is more basic than H2O, therefore NH2− (Conjugate base of weak acid NH3) is a stronger base than OH−.

### The best reagent for converting, 2-phenylpropanamide into 1- phenylethanamine is ____. (i) excess H2/Pt (ii) NaOH/Br2 (iii) NaBH4/methanol (iv) LiAlH4/ether

Solution: Option (ii) is the answer. Reason: By Hoffmann bromamide degradation reaction, the amine formed contains one carbon less than that present in the amide.

### Q72) Select the CORRECT pair A) Adaptive Radiation – Darwin’s Finches B) Connecting Link – Sewall – Wright effect C) Genetic drift – Peppered moth D) Industrial Melanism – Archeopteryx

Correct option: A Explanation: Adaptive Radiation – Darwin’s Finches: Darwin’s finches are a classic example of adaptive radiation. The process in which one species gives rise to multiple species...

### Q61) The coordinator between Nervous and endocrine system is A) Thalamus B) Hypothalamus C) Epithalamus D) Colliculus

### Q53) One of the following pair of animals is an example of commensalism A) Sacculina – crab B) Plasmodium – Anopheles C) Golden Jackal – Tiger D) Ascaris – Man

Correct option: C Explanation: Golden Jackal – Tiger is the example of commensalism. Commensalism is a long-term biological interaction in which member of one species gain benefit and the second...

### Q51) Forceful muscular contractions of uterine wall is involved in A) Implantation B) Lactation C) Micturition D) Parturition

Correct option: D Explanation: Parturition means child birth. It is the process of bringing forth a child from the womb. As the baby leaves the uterus, the uterine walls get approximated closely....

### Identify the product B in following reaction:

$2,2-Dichloropropane\xrightarrow[\Delta ]{aq.KOH}A\xrightarrow[ii)\,{{H}^{+}}]{i)\,Mg,\,Benzene}B$ Propanal Propanone isopropyl Magnesium Chloride Pinacol Solution: Pinacol $...

### n the given diagram, the role of ‘X’ is to A) Generate cardiac impulse B) Cause atrial systole C) Cause ventricular diastole D) Carry cardiac impulse to ventricles

Correct option:(D)Carry cardiac impulse to ventricles Solution: X is bundle of His. Also called a atrioventricular bundle. Bundle of many cardiac muscle fibers specialized in electric conduction....

### prove that : (1 + tan2 A) (1 – sin A) (1 + sin A) = 1.

L.H.S. = (1 + tan2 A) (1 – sin A) (1 + sin A)

### The interaction observed in this diagram is A) Commensalism B) Competition C) Mutualism D) Predation

Correct option:(D)Predation Solution: Commensalism is the relationship wherein one organism is benefitted while others remain unaffected. Predation means to the act of feeding on other animals....

### If

find A(BA)

### Find the domain and the range of each of the following real f(x)=3x-2/x+2

Answer : Given: Need to find: Where the functions are defined. Let,--------------------------- (1) To find the domain of the function f(x) we need to equate the denominator of the function to 0....

### Find the domain and the range of each of the following real f(x)=1/x-5 function:

Answer : Given: Need to find: Where the functions are defined. Let,-------------------------- (1) To find the domain of the function f(x) we need to equate the denominator of the function to 0....

### If f(x) = x-1/x+1 then show that

(i) f(1/x) = – f(X)

(ii) f(-1/x)=-1/f(x)

### Q31) During anaerobic respiration the conversion of pyruvate into acetaldehyde, along with co-enzyme TPP, the cofactor required is A) Mg++ B) Mn++ C) Fe++ D) Zn++

Correct option: A Explanation: During anaerobic respiration the conversion of pyruvate into acetaldehyde, along with co-enzyme TPP, the cofactor required is Mg++.

### Q28) Anemophily is NOT observed in A) Maize B) Jowar C) Sugarcane D) Salvia

Correct option: D Explanation: In Salvia, there is a special mechanism known as lever mechanism or turn pipe mechanism. This enhances the pollination method of entomophily where insects acts as...

### Q27) To induce formation of organs in a callus it is necessary to provide A) growth hormones B) water C) soil D) antibiotics

Correct option: A Explanation: Growth hormones which are also called as phytohormones are organic materials that influence the physiological process in plants. Growth hormones like auxin and...

### Q26) Earthworm is a A) herbivore B) secondary consumer C) tertiary consumer D) detrivore

Correct option: D Explanation: Detritivore are heterotrophs that get their nutrition by feeding on the detritus. Earthworms are detritivore as they eat decaying plant and animal matter in the soil....

### Q25) The initial step in preparation of beer is A) malting B) carboxylation C) clarification D) distillation

Correct option: A Explanation: Brewing Is the production of beer from a starch source in water and fermenting the resulting sweet liquid with yeast. The first step in preparation of beer is...

### Q19) Which one of the following is a non-endospermic seed ? A) sunflower B) coconut C) ground nut D) wheat

Correct option: C Explanation: Groundnut is a non-endospermic seed. The endosperm is a food storing tissue produced inside the seeds of most of flowering plants. It is a product of most of the...

### Q13) What is NOT true about emasculation of a flower while performing an artificial cross ? A) It is removal of anthers from flower B) It is done before anthesis C) It is to avoid self pollination D) It is done in flowers of plants selected as male parent

Correct option: D Explanation: While performing an artificial cross - It is done in flowers of plants selected as the male parent

### Q10) Transposons are sequences of A) DNA B) mRNA C) rRNA D) Trna

Correct option: A Explanation: Transposons are sequences of DNA. They are also known as jumping genes as they move from one location on the genome to another.

### Q2) Considering mode of asexual reproduction, match the Column I with II and select the correct option : I II a. Yeast i. fragmentation b. Penicillium ii. zoospores c. Filamentous algae iii. budding d. Chlamydomonas iv. conidia A) a-iii, b-iv, c-i, d-ii B) a-ii, b-iii, c-i, d-iv C) a-iv, b-iii, c-ii, d-i D) a-iii, b-ii, c-i, d-iv

Correct option: A Explanation: Yeast shows asexual reproduction by budding, where a small bud os formed on the parent bud. The asexual reproduction in Penicillium starts with the development of...

### In eukaryotes, the anticodon of tRNA that pairs with the start codon of mRNA during translation is (1) UAA (2) UCA (3) UAC (4) UUU

Correct option:(3) UAC Solution: In eukaryotes, initial codon on m-RNA is AUG. During translation, t-RNA, anticodons are exactly complementary to m-RNA. Hence anticodon will be UAC. [A = U, U = A, C...

### In amplitude modulation

(A) amplitude remains constant but frequency change (B) both amplitude and frequency do not change (C) both amplitude and frequency change (D) amplitude of the carrier wave changes according to...

### Identify the INCORRECT statement regarding Bt Cotton. (1) Dried spores of Bacillus thuringiensis are sprayed on its vulnerable leaves (2) It releases toxin that causes swelling in the gut of insect that ingest its leaves (3) It is a transgenic plant (4) It can produce toxin due to gene introduced in it by transgenesis

Correct option:(1)Dried spores of Bacillus thuringiensis are sprayed on its vulnerable leaves Solution: Bt toxin is produced by bacteria Bacillus thuriengiensis. During sporulation, these bacteria...

### Co-enzymes of Electron Transport Chain in mitochondria are _________ (1) Cytochromes, dehydrogenases, flavoproteins (2) Cytochromes, catalases, peroxidases (3) Hyaluronidases, dehydrogenases, hydrolases (4) Flavoproteins, anhydrases, phosphatases

Correct option:(1)Cytochromes, dehydrogenases, flavoproteins Solution: Co-enzymes of Electron Transport Chain in mitochondria are cytochromes, dehydrogenases, flavoproteins

### The part labelled ‘X’ in given diagram of T.S. of adrenal gland secretes ________

(1) Calcitonin (2) Catecholamines (3) Cortisol (4) Mineralocorticoids Correct option: (2) Catecholamines Solution: X is adrenal Medulla. It secretes two hormones known as adrenaline (epinephrine)...

### If then (A) (B) (C) (D) 1

Option D $ \text { Let } I=\int \sqrt{\frac{x-5}{x-7}} {d x } {=\int \sqrt{\frac{(x-5)(x-5)}{(x-7)(x-5)}} d x} \text { [rationlising] } $ $ \begin{array}{l} =\int \frac{x-5}{\sqrt{x^{2}-5 x-7 x+35}}...

### Discuss the nature of roots of the following equations: (i)

(ii)

(i) \[\mathbf{3}{{\mathbf{x}}^{\mathbf{2}}}~\text{ }\mathbf{7x}\text{ }+\text{ }\mathbf{8}\text{ }=\text{ }\mathbf{0}\] Let us consider, \[a\text{ }=\text{ }3,\text{ }b\text{ }=\text{ }-7,\text{...

### A rectangle of area

has its length equal to x cm. Write down its breadth in terms of x. Given that the perimeter is

cm, write down an equation in x and solve it to determine the dimensions of the rectangle.

Given: Perimeter of rectangle = \[44\] cm Length + breadth = \[44/2\text{ }=\text{ }22\]cm Let us consider length be ‘x’ Breadth be ’\[22-x\]’ So according to the question, \[\begin{array}{*{35}{l}}...

### The general solution of differential equation is

(A)

(B)

(C)

(D)

CORRECT OPTION: A Let $x+y=V$ $1+\frac{d y}{d x}=\frac{d v}{d x}$ $\frac{d y}{d x}=\frac{d v}{d x}-1$ $\therefore \frac{d v}{d x}-1=\cos V$ $\frac{d v}{d x}=1+\cos V$ $\frac{d v}{d x}=2 \cos...

### The difference between the squares of two numbers is

. The square of the smaller number is

times the larger number. Determine the numbers.

Let us consider the larger number be ‘x’ Smaller number be ‘y’ So according to the question, \[{{x}^{2}}~\text{ }{{y}^{2}}~=\text{ }45\]… (i) \[{{y}^{2}}~=\text{ }4x\]… (ii) Now substitute the value...

### The sum of two numbers is

and the sum of their squares is

. Taking one number as x, form ail equation in x and solve it to find the numbers.

Given: Sum of two number = \[9\] Let us consider first number be ‘x’ Second number be ‘\[9-x\]’ So according to the question, \[\begin{array}{*{35}{l}} {{\left( x \right)}^{2}}~+\text{ }{{\left(...

### A parallel combination of pure inductor and capacitor is connected across a source of alternating e.m.f. ‘ e’. The currents flowing through an inductor and capacitor are and respectively. In this parallel resonant circuit, the condition for currents , and is ( net r.m.s. current in the circuit) (A) (B) (C) (D)

The correct option is option (A)$i \doteq 0, i_{L}=i_{C} \neq 0$ In parallel resonant circuit, the capacitive and inductive reactance are equal, hence currents are equal but $180^{\circ}$ out of...

### Find the sum of first 15 multiples of 8.

Solution: The first 15 multiples of 8 are 8, 16, 24, 32, … to 15 terms Here, a = 8, d = 16 – 8 = 8 , n = 15

### How many terms of the AP 21, 18, 15, … must be added to get the sum 0?

Solution: The given AP is 21, 18, 15,… Here, a = 21 and d = 18 – 21 = -3, We have, sum = 0 Let number of terms be n, then we can write:

### A cylindrical roller made of iron is 2 m long. Its inner diameter is 35 cm and the thickness is 7 cm all round. Find the weight of the roller in kg, if 1 cm3 of iron weighs 8 g.

Solution: Length of the roller, h = 2 m = 200 cm [1m = 100 cm] Inner diameter = 35 cm Inner radius, r = 35/2 cm Thickness = 7 cm Outer radius, R = (35/2)+7 = (35+14)/2 = 49/2 cm Volume of the iron...

### A man purchased 47 stamps of 20p and 25p for 10 . Find the number of each type of stamps.

Solution: Suppose the no. of stamps of $20 \mathrm{p}$ and $25 \mathrm{p}$ be $\mathrm{x}$ and $\mathrm{y}$ respectively. Then according the question $\begin{array}{l} x+y=47\dots \dots(i) \\ 0.20...

### A point P (a, b) becomes

after reflection in the x-axis, and P becomes (d, 5) after reflection in the origin. Find the values of a, b, c and d.

According to the question, point P (a, b) and the image of P (a, b) after reflected in the x-axis be (a, -b) But it is According to the question as \[(-2,c)\] Thus, \[a\text{ }=\text{ }-2,\text{...

### A point P (a, b) is reflected in the x-axis to P’

, write down the values of a and b. P” is the image of P, when reflected in the y-axis. Write down the co-ordinates of P”. Find the co-ordinates of P”, when P is reflected in the line parallel to y-axis such that x =

.

According to the question:, P’ \[(2,-3)\] is the reflection of P (a, b) in the x-axis Hence, the co-ordinates of P’ will be (a, – b) but P’ is \[(2,-3)\] On comparing, we get a = \[2\], b = \[3\]...

### Some dividing cells exit the cell cycle and enter vegetative inactive stage. This is called quiescent stage (G0). This process occurs at the end of (1) G1 phase (2) S phase (3) G2 phase (4) M phase

Correct option:(4)M phase Solution: ●Some dividing cells exit the cell cycle and enter vegetative inactive stage, called quiescent stage (G0). ●Process occurs at the end of M−phase and beginning of...

### According to Robert May, the global species diversity is about (1) 20 million (2) 50 million (3) 7 million (4) 1.5 million

Correct option:(3)7 million Solution: According to Robert May, global species diversity is about 7 million.

### correct option. Column-I Column-II (a) Organ of Corti (i) Connects middle ear and pharynx (b) Cochlea (ii) Coiled part of the labyrinth (c) Eustachian tube (iii) Attached to the oval window (d) Stapes (iv) Located on the basilar membrane

Correct option:(2)Cochlea (ii) Coiled part of the labyrinth Solution: ●Organ of Corti - Organ of the inner ear located within the cochlea on the basilar membrane. ●It contributes to the audition....

### Identify the basic amino acid from the following. (1) Glutamic Acid (2) Lysine (3) Valine (4) Tyrosine

Correct option:(2)Lysine Solution: ●Glutamic Acid - is an acidic amino acid. ●Lysine - is a basic amino acid. ●Valine - is an aliphatic amino acid. ●Tyrosine - is an aromatic amino acid.

### Which of the following is not an attribute of a population? (1) Natality (2) Mortality (3) Species interaction (4) Sex ratio

Correct option:(3)Species interaction Solution: ●Natality, Mortality and sex ratio are attributes of a population. ●Species interaction can be inter or intraspecific. ●Population forms the part of...

### Number of possible isomers for the complex [Co(en)2Cl2 ]Cl will be: (en = ethylene diamine)

(1) 3 (2) 4 (3) 2 (4) 1 Correct Answer: (1) 3 Explanation:

### Q 71. Which one of the following are analogous structures? Option A Gills of prawn and lungs of man Option B Thorns of Bougainvillea and tendrils of Cucurbita Option C Flippers of dolphin and legs of horse Option D Wings of bat and wings of pigeon

Correct Option: A Solution: Analogous structures are those whose basic structure is the same but have different functions. Gills of prawn and lungs of man are analogous structures

### In photosynthesis, the light-independent reactions take place at: (1) Stromal matrix (2) Thylakoid lumen (3) Photosystem – I (4) Photosystem-II

Correct option: In photosynthesis, the light-independent reactions take place at Stromal matrix Solution: The light independent reaction takes place in the stromal matrix. The light dependent...

### In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree

(1) X-linked dominant (2) Autosomal dominant (3) X-linked recessive (4) Autosomal recessive Correct option: Solution: In the following human pedigree, the filled symbols represent the affected...

### Q 55. When the margins of sepals or petals overlap one another without any particular direction, the condition is termed as: Option A Imbricate Option B Twisted Option C Valvate Option D Vexillary

Correct Option: A Solution: Imbricate is the condition when the margins of sepals or petals overlap one another without any particular direction. Like as in the Gulmohar.

### Match the following parts of a nephron with their function :

(a) Descending limb (i) Reabsorption of of Henle’s loop salts only

(b) Proximal (ii) Reabsorption of convoluted tubule water only

(c) Ascending limb (iii) Conditional of Henle’s loop reabsorption of sodium ions and water

(d) Distal convoluted (iv) Reabsorption of tubule ions, water and organic nutrients

Select the correct option from the following :

(1) (a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)

(2) (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)

(3) (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)

(4) (a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)

The correct option is (3) (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii). The explanation is as follows.

### The structure of isobutyl group in an organic compounds is:

Solution: Correct Option B The term 'iso' refers to the presence of one Methyl group on the second carbon of a normal chain branch. The 'Yl' suffix was previously used to denote one -H less than the...

### In which of the following both pairs have corrected combination?

1 Gaseous nutrient cycle Sulphur and phosphorus Sedimentary nutrient cycle Carbon and nitrogen 2 Gaseous nutrient cycle Carbon and nitrogen Sedimentary nutrient cycle Sulphur and phosphorus 3...

### The term ‘’linkage’’ was coined by (1) W. Sutton (2) T.H. Morgan (3) T. Boveri (4) G. Mende

Correct option: The term ‘’linkage’’ was coined by T.H. Morgan. Explanation for the correct option: The term” linkage” was coined by T.H Morgan. Sutton is known for his “chromosome is the basis of...

### Q 5. Which of the following shows coiled RNA strand and capsomeres? Option A Tobacco mosaic virus Option B Measles virus Option C Retrovirus Option D Polio virus

Correct Option: A Explanation: Coiled RNA strands and capsomeres are shown by the tobacco mosaic virus.

### Which of the following is the correct order of increasing field strength of ligand to form coordination compound? A. B. C. D.

Correct Option: D) In general, ligands can be arranged in the following order in terms of increasing field strength: In accordance with the spectrochemical series $I ^{-}< Br ^{-}< SCN...

### DNA strands on a gel stained with ethidium bromide when viewed under UV radiation, appear as (1) Yellow bands (2) Bright orange bands (3) Dark red bands (4) Bright blue bands

Correct option:(2)Bright orange bands Solution: After the bands are stained, they are viewed in UV light. Bands appear bright orange in colour. Ethidium bromide is the intercalating agent that...

### Which of the following structures is not found in prokaryotic cells? (1) Plasma membrane (2) Nuclear envelope (3) Ribosome (4) Mesosome

Correct option: (2) Explanation for the correct option: The prokaryotic cells lack membrane bound organelles. The true nucleus is absent and is replaced by membrane less nucleoid....

### Which one is a wrong statement? (1) Brown algae have chlorophyll a and c, and fucoxanthin (2) Archegonia are found in Bryophyta, Pteridophyte and Gymnosperms (3) Mucor has biflagellate zoospores (4) Haploid endosperm is typical feature of Gymnosperms

Correct option: (3) Explanation for the correct option: Mucor has biflagellate zoospores is the wrong statement. Mucor is a non-flagellate fungus belonging to the Class Zygospore of kingdom Fungi....

### The slant height of the frustum of a cone is and the perimeters of its circular ends are and . Find the curved surface of the frustum.

As per the given information, Slant height of frustum of the cone as given in the question (l) $=4cm$ Let us assume that the ratio of the radius of the top circle to bottom circles...

### A radioactive nucleus Z undergoes spontaneous decay in the sequence in following manner where Z is the atomic number of element X. The possible decay particles in the sequence are

Solution : Answer 3 β+ decreases the atomic number by 1, α decreases the atomic number by 2, and the β- decreases the atomic number by 1. Hence the correct order is given by the option 3

### In the following cases, find the coordinates of the foot of the perpendicular drawn from the origin.

(a) 2x + 3y + 4z – 12 = 0

(b) 3y + 4z – 6 = 0

Solution: (a) $2 x+3 y+4 z-12=0$ Let the coordinate of the foot of $\perp P$ from the origin to the given plane be $P(x, y, z)$. $2 x+3 y+4 z=12 \ldots$ The direction ratio are $(2,3,4)$...

### Find the angle between the following pair of lines:

(i) and

(ii) and

Solution: It is known to us that If $\frac{\mathrm{x}-\mathrm{x}_{1}}{1_{1}}=\frac{\mathrm{y}-\mathrm{y}_{1}}{\mathrm{~m}_{1}}=\frac{\mathrm{z}-\mathrm{z}_{1}}{\mathrm{n}_{1}} \text { and }...

### 180. A typical fat molecules is made up of: (1) Three glycerol molecules and one fatty acid molecules (2) One glycerol and three fatty acid molecules (3) One glycerol and one fatty acid molecule (4) Three glycerol and three fatty acid molecules

Solution: (2) Fat is a triglyceride composed of three fatty acid molecules and one glycerol molecule.

### 179. A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is containing more number of chromosomes as compared to other dividing cells. This would result in: (1) Aneuploidy (2) Polyploidy (3) Somaclonal variation (4) Polyteny

Solution: (2) Polyploidy cells have more than double the amount of chromosomes as haploid cells.

### 178. A river with an inflow of domestic sewage rich in organic waste may result in: (1) Drying of the river very soon due to algal bloom. (2) Increased population of aquatic food web organisms. (3) An increased production of fish due to biodegradable nutrients. (4) Death of fish due to lack of oxygen.

Solution: (4) The dissolved oxygen (DO) in a river with an input of home sewage rich in organic waste will be reduced, potentially resulting in fish death due to a lack of oxygen.

### 177. The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals, include the: (1) Halophiles (2) Thermoacidophiles (3) Methanogens (4) Eubacteria

Solution: (3) Archaebacteria are the most primordial prokaryotes that initially appeared on Earth because they were able to live in the anaerobic hard environment of the time. Archaebacteria include...

### 176. Stems modified into flat green organs performing the functions of leaves are known as: (1) Cladodes (2) Phyllodes (3) Phylloclades (4) Scales

Solution: (3) Phylloclade is the alteration of the stem into flat green organs that execute the tasks of leaves, whereas phyllode is the modification of the petiole.

### 175. Which of the following guards the opening of hepatopancreatic duct into the duodenum? (1) Semilunar valve (2) Ileocaecal valve (3) Pyloric sphincter (4) Sphincter of Oddi

Solution: (4) The sphincter of Oddi protects the entry of the hepatopancreatic duct into the duodenum.

### 174. Specialized epidermal cells surrounding the guard cells are called: (1) Complementary cells (2) Subsidiary cells (3) Bulliform cells (4) Lenticels

Solution: (2) Both subsidiary cells and guard cells are modifications of epidermal cells, however guard cells have chloroplasts, whilst subsidiary cells do not.

### 173. Which of the following statements is not correct? (1) Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style. (2) Insects that consume pollen or nectar without bringing about pollination are called pollen nerctar ⁄ robbers. (3) Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil. (4) Some reptiles have also been reported as pollinators in some plant species.

Solution: (1) A style can grow from more than one pollen tube of the same species. It's a common occurrence in nature.

### 172. Which of the following is not a characteristic feature during mitosis in somatic cells? (1) Spindle fibres (2) Disappearance of nucleolus (3) Chromosome movement (4) Synapsis

Solution: (4) Synapsis is the pairing of homologous chromosomes that takes place during meiosis but not in mitosis.

### 171. It is much easier for a small animal to run uphill than for a large animal, because: (1) It is easier to carry a small body weight. (2) Smaller animals have a higher metabolic rate. (3) Small animals have a lower O2 requirement (4) The efficiency of muscles in large animals is less than in the small animals.

Solution: (2) Smaller animals have a greater BMR, which is linked to long-term energy generation and muscle weariness.

### 170. In a testcross involving F1 dihybrid flies, more parental – type offspring were produced than the recombinant – type offspring. This indicates: (1) The two genes are located on two different chromosomes (2) Chromosomes failed to separate during meiosis (3) The two genes are linked and present on the same chromosome (4) Both of the characters are controlled by more than one gene

Solution: (3) When a plant genotype Aa Bb crosses with aabb, Independent Assortment produces four types of progeny in equal proportions. Aa Bb – gametes AB Ab aB ab Aa bb – Gametes ab ab ab ab...

### 169. Which of the following is wrongly matched in the given table? (1) Microbe Product Application Trichoderma polysporum Cyclosporin A Immunosuppressive drug (2) Microbe Product Application Monascus purpureus Statins Lowering of blood cholesterol (3) Microbe Product Application Streptococcus Streptokinase Removal of clot from blood vessel (4) Microbe Product Application Clostridium butylicum Lipase Removal of oil stains

Solution: (4) The bacterium Clostridium butylicum is used to make butyric acid. Lipase is produced by Candida lipolyticum.

### 168. Seed formation without fertilization in flowering plants involves the process of: (1) Sporulation (2) Budding (3) Somatic hybridization (4) Apomixis

Solution: (4) Apomixis is a unique technique that allows seeds to be produced without fertilisation.

### 167. In mammals, which blood vessel would normally carry largest amount of urea? (1) Renal vein (2) Dorsal aorta (3) Hepatic vein (4) Hepatic portal vein

Solution: (3) The urea–ornithine cycle occurs in the liver, hence the vein that leaves the liver has the most urea, which is the hepatic vein.