Free Cell Cycle And Cell Division (Daily Quiz: 13) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Free Cell Cycle And Cell Division (Daily Quiz: 13) Time:

Question-1

Assertion:
Interphase occupies 75-95% of the total generation time.
Reason:
Interphase (I-phase) is the long non-dividing phase.

(a)

(b)

(c)

(d)

Explanation:

Answer: (b)

The cell cycle is divided into two basic phase : (i) Interphase, (ii) M-phase. The M phase represents the phase when the actual cell division of mitosis occurs and the interphase represents the phase between two successive M phase. In the 24 hour average duration of cell cycle of human cell, cell division proper lasts for only about an hour. The interphase lasts more than 95% of the duration of cell cycle.


Question-2

Which statement best explains the evolutionary advantage of meiosis?

(a)

(b)

(c)

(d)

Explanation:

Answer: (a)

Meiosis involves exchange of genes between homologous chromosomes. So the gametes produced are genetically different from each other. Offsprings produced by the fusion of gametes therefore also show recombinations or genetic variations. These variations in the offsprings make organisms more adaptable to the environment and these have a definite role in evolution.


Question-3

Sister chromatids

(a)

(b)

(c)

(d)

Explanation:

Answer: (b)

Crossing over and genetic recombination occur during prophase I.


Question-4

If you are provided with root-tips of onion in your class and are asked to count the chromosomes, which of the following stages can you most conveniently look into?

(a)

(b)

(c)

(d)

Explanation:

Answer: (b)

Metaphase is a stage of mitosis in the eukaryotic cell cycle in which chromosomes are at their most condensed and coiled stage. Metaphase is the best stage in mitosis for analysing the chromosomes and to study their morphology.


Question-5

In pachytene stage of meiosis the chromosomes appear

(a)

(b)

(c)

(d)

Explanation:

Answer: (d)

During the pachytene, chromosomes get crossed with each other and forms a four stranded or tetrad appearance.


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