Question

Which one of the following is surrounded by a callose wall ?

(a) Microspore mother cell 

(b) Male gamete 

(c) Egg 

(d) Pollen grain

Answer 1

Correct option (a) Microspore mother cell 

Explanation

The wall of the pollen mother cell (microspore mother cell) is deposited by callose (β-1, 3-glucan). Callose plays a significant role in reproductive biology of angiosperms. It acts as a temporary wall to prevent the product of meiosis from cohesion and fusion and its dissolution results in the release of free spores.