Question

When the pollen tube enters into the embryo sac, pollen tube has:

• A. Three male nuclei
• B. Two male nuclei
• C. One gamete nucleus
• D. Four male gametes

Answer 1

The correct option is B

Two male nuclei

If a pollen grain falls on a suitable stigma, it starts germinating. A mature pollen consists of two cells. The larger one is vegetative cell and the smaller one is the generative cell. The vegetative cell starts growing and emerges through the germination pore. It develops through the style as a long tube known as pollen tube. The generative cell gets into the tube and divides into two male gametes (sperms). At the time of entering into ovule, pollen tube has two male nuclei.