Question

a total of 168 pollengrains with 14 chromosomes in each pollen grain are released from a mature microsporangium. Mention the ratio of pollen mother cells,generative cells, vegetative cells and male gametes produced by microsporangium.

Answer 1

Answer:

Explanation:

No of PMC =42

Generative cell and vegetative cell=168

Male gamete=168

So in ratio 1:4:4

At 2 celled stage

Answer 2

Answer:

The ratio is found to be 1:4:4:4

Explanation:

Given - 168 pollen grains, with 14 chromosomes each

To find - ratio of PMC to generative cells to vegetative cells and male gamete

Solution - we know that 1 pollen mother cell (PMC) can produce 4 pollen grains.
Thus, we understand that the number of PMCs responsible for this release are 42.

No. of PMC = 42

We also know that 1 mature pollen grain contains 1 vegetative and 1 generative cell.

Thus, No. of vegetative cells = 168
          No. of generative cells = 168

Now, each generative cell produces 1 male gamete. Thus, 168 generative cells produce 168 male gametes.

Thus, No. of male gametes = 168

Now, we find the ratio to be -

PMC:generative cells:vegetative cells:male gamete = 42:168:168:168

PMC:generative cells:vegetative cells:male gamete = 1:4:4:4

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