1. Tardigrade
  2. Question
  3. Biology
  4. What words will correct fill (a) , (b) , (c,) and (d) in the following paragraph? (a) develops into a pollen grain. The outer layer is (b) and inner layer is intine. The inner layer is made up of cellulose and (c) . In 60% of the angiosperms, pollen grains are shed at (d) celled stage.

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Q. What words will correct fill $\left(a\right)$ , $\left(b\right)$ , $\left(c,\right)$ and $\left(d\right)$ in the following paragraph?
$\left(a\right)$ develops into a pollen grain. The outer layer is $\left(b\right)$ and inner layer is intine. The inner layer is made up of cellulose and $\left(c\right)$ . In 60% of the angiosperms, pollen grains are shed at $\left(d\right)$ celled stage.

NTA AbhyasNTA Abhyas 2020Sexual Reproduction in Flowering Plants

Solution:

The microspore develops into a pollen grain. The outer layer is exine. The inner layer is called intine and it is made up of cellulose and pectin. In 60% angiosperms, pollen grains shed at 2 - celled stage. In others, they are shed at 3 celled stages as the generative cell divides mitotically to form 2 male gametes.