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CBSE 11th Standard Biology Subject Cell Cycle and Cell Division HOT Questions 2 Marks Questions With Solution 2021

Published on: 29/05/2021

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Questions:

Generic 2

5 x 2 = 10

While examining mitotic stage in a tissue. One finds some cells with 16 chromosomes and some with 32 chromosomes. What possible reasons could you assign to this difference in chromosome number? Do you think that cells with 16 chromosomes number could have arisen from cells with 32 chromosomes or vice-versa?

Colchicine is known to be the mitotic poison. How?

How would you analyse that the cell's entire energy is devoted to the process of division in the M-phase?

The second meiotic division is similar to mitosis as it results in the separation as it results in the separation of the sister chromatids. However, it also differs from mitosis. Explain how?

Substance W is a chemical that inhibits spindle formation during cell division. If a meristematic plant cell were exposed to substance W, which process will not be able to occur in that plant cell?

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Answers Key:

Generic 2

5 x 2 = 10

This shows that the cells with 16 chromosomes are parent cells that had undergone mitotic divisions, whereas, cells with 32 chromosomes are the cells that had not undergone the process of segregation.

Colchicine is considered to be the mitotic poison because
(i) This alkaloid inhibits the formation of spindle by preventing assembly of microtubules. It is an alkaloid obtained from the corms of Autumn crocus.
(ii) The chromosomes duplicate, but they remain within the same cell, increasing the number of chromosomes. As a result, the colchicine treated meristematic cells show doubling of chromosome.

Gene expression, protein synthesis, secretion, motility etc, do not happen during M-phase.

The main reason for the difference between the two is that the separating sister chromatids during the meiosis-II differ genetically due to crossing over that had occurred during prophase-I.

When a meristematic plant cell were exposed to the substance W, the separation of sister chromatids will be inhibited.