Question

What is the ratio of mitotic divisions that take place in the microspore of Cycas before and after liberation from the microsporangium during the development of mate gametophyte?

• A. 2:1
• B. 3:2
• C. 1:1
• D. 1:2

Answer 1

The correct option is C 1:1

Before pollination, microspore pollen grain divides to give prothalial cell and anthredial cell. Anthredial cell then give rise to tube cell and generative cells which remains dormant for about a year.
After pollination, the microspore or pollen grain produces stalk cell and body cell. The body cell then undergoes mitotic division to produce sperm in the ratio of 1:1.