Question

A callose covering is present over

• A. egg
• B. pollen grain
• C. male gamete
• D. none of the above

Answer 1

Answer: (C)

male gamete

The microspore or pollen grain is the first cell of male gametophyte. The microspore starts dividing and it is known as precocious.

Microspore may be best defined is specially developed male gametes. Microspore nucleus divides mitotically to form a smaller generative cell near the larger vegetative cell. A callose layer is developed around the generative cell. Regenerative cell loses its contact with the wall of microspore and becomes free in the cytoplasm. The callus layer then dissolves. The pollen grains are shed from the answer at this bicelled stage.

So, the correct option is 'male gamete'.