State the difference between:

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ICSE | Structure of Chromosomes, Cell Cycle and Cell Division

State the difference between:

(a) Chromosome and chromatid

(b) Centrosome and Centromere

(c) Aster and spindle fibres

(d) Haploid and diploid

(a) Chromosome and chromatid

Chromosome	Chromatin
Chromosomes are nucleus that contains cell’s DNA which is arranged into discrete units.	Chromatin is a chromosome that contains one single long DNA molecule connected with many proteins.

(b) Centrosome and Centromere

Centrosome	Centromere
Centrosome is only in present animal cells and is located near the nucleus. It has one or two centrioles.	During the beginning of the cell division there is two chromatids joined at some point along the same length and this point of attachment is called centromere.

(c) Aster and spindle fibres.

Aster	Spindle fibres
Each daughter centrioles of the cell is surrounded by the radiating rays and is called as the aster.	Number of fibres that appear in between the two daughter centrioles are called the spindle fibres.

(d) Haploid and diploid

Haploid	Diploid
Only half the number of chromosomes is passed on to each daughter cell which is the haploid (n).	Full Set of chromosomes is passed on to each daughter cell which is the diploid (2n).

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More Material

A …… lens is used to correct myopia and a ….. lens is used to correct hypermetropia.
A Concave, concave
B Convex, convex
C Convex, concave
D Concave, convex

Rate of reaction of any substance depends on
(A) active mass
(B) molecular weight
(C) atomic weight
(D) equivalent weight

Formula of oleum is
(A) $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7}$
(B) $\mathrm{H}_{2} \mathrm{SO}_{4}$
(C) $\mathrm{H}_{2} \mathrm{SO}_{3}$
(D) $\mathrm{H}_{2} \mathrm{SO}_{5}$

A line passes through the point (2, 1, -3) and is parallel to the vector Find the equations of the line in vector and Cartesian forms.

If the points $A(a, 0), B(0, b)$ and $C(1,1)$ are collinear, prove that $\frac{1}{a}+\frac{1}{b}=1$

If $A(-2,0), B(0,4)$ and $C(0, k)$ be three points such that area of a $A B C$ is 4 sq units, find the value of $k$ .

Find the value of $k$ for which the area of a ABC having vertices $A(2,-6), B(5,4)$ and $C(k, 4)$ is 35 sq units.

Find the value of $k$ for which the points $A(1,-1), B(2, k)$ and $C(4,5)$ are collinear.

Find the value of $k$ for which the points $P(5,5), Q(k, 1)$ and $R(11,7)$ are collinear.

Find the value of $k$ for which the points $A(3,-2), B(k, 2)$ and $C(8,8)$ are collinear.

Use determinants to show that the following points are collinear. $P(-2,5), Q(-6,-7)$ and $R(-5,-4)$

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