Cell Cycle And Cell Division Question 30
Question: How many reduction divisions are necessary for the formation of 200 grains of wheat [MHCET 2002]
Options:
250
150
200
360
Show Answer
Answer:
Correct Answer: A
Solution:
For the formation of 100 grains of wheat 100 pollen grains and 100 megaspores are required.
Each microspore mother cell produces 4 microspores (pollen grains) as a result of reduction division.
Hence for the formation of 100 pollen grains, $ \frac{100}{4}=25,PMC $ are needed and each will undergo one meiotic division.
Each megaspore mother cell will produce 4 megaspores, of which one becomes functional and the other three degenerate.
Thus each MMC produces one megaspore.
So 100 MMC are required to produce 100 megaspores.
Total number of reduction divisions to produce 100 grains is 100 + 50 = 150.
BETA
