Question

microspore tetrad is the result of
(a) mitotic cell division
(b) meiotic cell division
(c) Both a and b
(d) none of the above​

Answer 1

Correct step by step answer:

Pollen grains are formed from the microspore mother cell when it undergoes one meiotic division by the process of microsporogenesis and microgametogenesis.

Microsporogenesis is the formation of haploid microspores from diploid microspore mother cells through meiosis when each produces four microspores. These microspores then undergo mitosis division to form pollen grains which at maturity consist of only three cells, the tube cell, and two non- motile sperm cells. So, microgametogenesis is the development of microspore into mature pollen grains. The pollen grains are the male gametes formed in the anther sac and are located along the inner edge of the anther sacs.

Hence, during the formation of pollen grains, the microspore mother cell undergoes one meiotic division to produce four haploid microspores, generally in the form of a tetrad, which then develops into pollen grains.

So, the correct answer is '(a) One meiotic division'.

Answer 2

Microspore tetrad is the result of b) meiotic cell division.

Explanation:

• Microspore tetrad is formed when meiosis occurs in pollen mother cells.
• Cells of microspore tetrad will be haploid when plants are diploid.
• Microspore mother cells present inside the anther helps in formation of microspores.
• Formation of microspore tetrad is the meiosis division a pollen mother cell for formation of microspores.
• Tetrads means a group of four. Microspores are arranged in a group of four.
• Through meiotic division, cells in sporogenous tissues form microspore tetrad.