Question

If the amount of DNA in a sperm cell is 10 picogram, then what will be the amount in microsporocyte in a phase of the cell cycle?
A. 10 pg.
B. 20 pg.
C. 80 pg.
D. 40 pg.

Answer 1

Hint: Microsporocyte is the process of producing microspores by the meiosis. This is one of the mother cells. In angiosperms, the tissue (which is present in the anthers) is composed of microsporocytes. These are the diploid cells which undergo meiosis cell division. The amount of microsporocyte can be calculated by the amount of DNA in sperm cells. Through this, it can be found and analyzed.

Complete answer:
Cell cycle is the series that takes place in the cell that leads to the division and duplication of DNA. These produce two daughter cells. The sporogenous cells generally function as microsporocytes. These undergo meiotic division that gives rise to the microspore tetrads of haploid microspores. This grows as the male gametophyte from the minute spores. They are the diploid cells. They separate easily by becoming pollen grains. These pollen grains are also known as microgametophyte. And we already know that sperm cells are haploid. The amount of the microsporocyte in the cell cycle phase will double. Here, the amount of DNA of the sperm cell mentioned here is 10 picogram, so the microsporocyte amount will become 20.

So, the correct answer is Option B.

Note:
The formation of the microspores inside the pollen sacs is microsporogenesis. The diploid ones are called the pollen mother cells. Each of the microspores develops into the pollen grain. One picogram is the one trillionth of the gram and, also for the number of microsporocytes, one picogram equals two trillionth of gram. Through this, the amount of microsporocyte can also be calculated.