Free Cell Cycle And Cell Division (Daily Quiz: 3) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Free Cell Cycle And Cell Division (Daily Quiz: 3) Time:

Question-1

Mitotic spindle is mainly composed of which protein?

(a)

(b)

(c)

(d)


Question-2

How many reduction divisions are necessary for the formation of 200 grains of wheat?

(a)

(b)

(c)

(d)

Explanation:

Answer: (b)

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, ${100}/4$ = 25 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 100 MMC are required to produce 100 megaspores. Total number of reduction divisions to produce 100 grains is 100 + 25 = 125.


Question-3

Terminalization occurs during

(a)

(b)

(c)

(d)


Question-4

Assertion:
In oocytes, diplotene can last for months or years.
Reason:
It is at this stage that chromosome decondense and engage in RNA synthesis

(a)

(b)

(c)

(d)


Question-5

Which one of the following precedes re-formation of the nuclear envelope during M phase of the cell cycle ?

(a)

(b)

(c)

(d)

Explanation:

Answer: (a)

At the beginning of M phase or mitotic phase, the nuclear membrane and nucleolus disappear. The decondensation of chromosomes occur. But when nuclear envelopes restart forming then nuclear lamina assemble and chromosomes start condensing.


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