1. Tardigrade
  2. Question
  3. Biology
  4. A. The pollen grain is generally spherical measuring about 25-50 cm in diameter. B. In over 60% of angiosperms, pollen grains are shed at 2 celled stage. Select the statement that holds true for the above statement.

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Q. A. The pollen grain is generally spherical measuring about 25-50 cm in diameter.
B. In over 60% of angiosperms, pollen grains are shed at 2 celled stage.
Select the statement that holds true for the above statement.

NTA AbhyasNTA Abhyas 2020Sexual Reproduction in Flowering Plants

Solution:

The pollen grain is generally spherical measuring about 25-50 micrometre in diameter. In 60% of angiosperms, pollen grains are shed at 2 celled stages, the smaller cell is generative cell and the larger cell is a vegetative cell. In remaining 40% of angiosperms, generative cell divides to form 2 male gametes, thus pollen grains are liberated at 3 celled stage.