Question

In dicots, at how many places exine is absent in the pollen grain?

• A. 2
• B. 3
• C. 1
• D. more than 3

Answer 1

The correct option is D more than 3

The exine is the outer layer of the pollen grain made up of sporopollenin, which is the hardest and most resistant material. Pollen grains have prominent apertures called germ pores where sporopollenin is absent. Therefore, exine of the pollen grain is not a continuous layer. The sporopollenin is absent at germ pores. Pollen grains are triporate (3 germ pores) in dicot.

So, the correct answer is 'more than 3'.