Class 11

In a plant named Opuntia, the stem region is modified into a flattened green structure to carry out the function of leaves (i.e., photosynthesis). Enlist two other examples of such modifications of plant parts for photosynthesis.

Solution:In Australian Acacia, the petiole takes the shape of the leaf and turns green to perform the function of photosynthesis.Asparagus spears continue to grow, flat, green, leaflike...

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Roots obtain oxygen from the air present in the soil for respiration. In the absence or deficiency of O2, root growth is restricted or completely stopped. How do the plants growing in marshlands or swamps obtain their O2 required for root respiration?

Solution:In some plants such as Rhizophora growing in swampy areas, many roots come out of the ground and grow vertically upwards. Such roots, called pneumatophores, help to get oxygen for root...

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Name the stage of cell cycle at which one of the following events occur:
(i) Chromosomes are moved to spindle equator.

(ii) Centromere splits and chromatids separate.

(iii) Pairing between homologous chromosomes takes place.

(iv) Crossing over between homologous chromosomes takes place.

Solution: (i)In Metaphase, chromosomes are transported to the spindle equator. ii) In Anaphase, centrosomes split and chromatids separate. iii) In meiosis, the pairing of homologous chromosomes...

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Differentiate between the following:
(a) Diffusion and Osmosis

(b) Transpiration and Evaporation

(c) Osmotic Pressure and Osmotic Potential

(d) Imbibition and Diffusion

(e) Apoplast and Symplast pathways of movement of water in plants

(f) Guttation and Transpiration

Solution: The diffusion between all the following sets are- a) Diffusion and Osmosis DiffusionOsmosisIt is a form of passive transport in which a chemical moves from an area of higher concentration...

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Which of the following statements are true? If false, correct them:
(a) Boron deficiency leads to stout axis.

(b) Every mineral element that is present in a cell is needed by the cell.

(c) Nitrogen as a nutrient element is highly immobile in the plants.

(d) It is very easy to establish the essentiality of micronutrients because they are required only in trace quantities.

Solution: a) True b) False: Every mineral element found in a cell is not required by the cell. c) False- Nitrogen is a very mobile nutrient in plants. d) False- Since micronutrients are only...

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