Question

Which of the following nuclei are present in the pollen grain?

• A. Generative nucleus
• B. Polar nuclei
• C. Tube nucleus
• D. Non-polar nuclei

Answer 1

Answer: (A), (C)

The correct options are
A

Generative nucleus

C

Tube nucleus

The pollen grain contains two nuclei the generative and tube nucleus. The pollen tube develops from the pollen grain that falls on the stigma and grows towards the ovary. Nuclei of the pollen enter the pollen tube and travel along to reach the ovary. The generative nucleus divides in the pollen tube to form the two male gametes. The tube nucleus disintegrates. One of the male gametes that reach the ovary through the pollen tube fuses with the egg to form the zygote. The second male gamete fuses with the polar nuclei in the ovary and forms the endosperm.