Question

Q.2 A plant has 20 chromosomes in its leaves. How many chromosomes will it have in
(a)Pollen grains
(b) petals
(c) Egg cell
(d) Fruit​

Answer 1

The number of Chromosomes will be

a) Pollen Grains - 10 chromosomes

b) petals - 20 chromosomes

c) Egg cells - 10 chromosomes

d) Fruit - 20 chromosomes

Explanation:

a) Pollen grains are the male gametes of a plant. They, like all the gametes, are formed by meiosis which is also called reductional division. Hence, the number of chromosomes would be half the number of chromosomes in the non-sex cells or vegetative cells of the plant, that is, 10 chromosomes.

b) the cells which make up the petals are vegetative cells. Hence, they would have the total number of chromosomes, that is, 20 chromosomes.

c) Egg cells or the ovum is the female gamete and thus would contain half the total number of chromosomes, that is, 10 chromosomes.

d) the fruit is the fertilized embryo of the plant which is formed by fertilization, that is, the the union of the Egg cells (female gamete) and pollen grains (male gamete). Thus, it would have 10 chromosomes from the egg and 10 from the pollen, making it a total of 20 chromosomes.

Answer 2

A plant has 20 chromosomes in its leaves.

Explanation:

The count of Chromosomes will be

a) Pollen Grains - 10 chromosomes

b) Petals - 20 chromosomes

c) Egg cells - 10 chromosomes

d) Fruit - 20 chromosomes

a) Pollen grains are the male gametes of a plant.  

b) The cells which make the petals are vegetative cells. Hence, they would have the total count of chromosomes, that is, 20 chromosomes.

c) The fruit is the fertilized embryo of the plant which is formed by fertilization, that is, the combination of the Egg cells (female gamete) and pollen grains (male gamete). Thus, it would have 10 chromosomes from the egg and 10 from the pollen, making it a total of 20 chromosomes.

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