Cell-Cycle-And-Cell-Division Question 97
Question: How many reduction divisions are necessary for the formation of 200 grains of wheat?
Options:
A) 250
B) 150
C) 200
D) 360
Show Answer
Answer:
Correct Answer: A
Solution:
[a] For the formation of 200 grains of wheat - 200 pollen grains and 200 megaspores are required.
Each - microspore mother cell produces 4 microspores (pollen grains) as a result of reduction division.
Hence for the formation of 200 pollen grains, = 50 PMC are needed and each will undergo one reduction division.
Each megaspore mother cell will produce 4 megaspores in which one become functional and other three degenerate.
Thus each MMC produces one megaspore.
So 200 MMC are required to produce 200 megaspores.
Total number of reduction divisions to produce 200 grains is $ 200 + 50=250 $ .
BETA
