Question

The two nuclei at the end of the pollen tube are called

a.Tube nucleus and a generative nucleus
b.Sperm and ovum

c.Generative nucleus and stigma d.Tube nucleus and sperm​

Answer 1

The two nuclei at the end of the pollen tube are called Tube nucleus and generative nucleus .

Correct option is (a) Tube nucleus and generative nucleus.

• After pollination process, the pollen grains germinate into pollen tube .
• The pollen tube travels through stigma and style and reaches the ovules in the ovary .
• Then the generative nucleus divides into two male gametes in which one fuses with egg and the other one fuses with pollen nuclei.

Answer 2

The two nuclei at the end of the pollen tube are called tube nucleus and a generative nucleus.

• The pollen in most of the plants is released at the two-celled stage.

• These two cells are the tube nucleus and the generative nucleus.

• The pollen lands on the stigma. The pollen undergoes pollen-pistil interaction and the pollen tube originates from the germ pore of the pollen.

• The vegetative nucleus has abundant nutrients and the generative cell further divides to form 2 male gametes.

• One male gamete fuses with the egg cell and the other male gamete fuses with the central cell to form a secondary endosperm nucleus.