Previous year MCQs

General science UPPSC 2024 GS-I
Question

Which of the following statements is not true?

Answer & Solution

Answer: (Detailed Solution Below)

Option B: Nucleus of a cell does not play a role in cellular reproduction.

Detailed Solution:

The correct answer is “Nucleus of a cell does not play a role in cellular reproduction.”.
The nucleus plays a crucial role in cellular reproduction (such as mitosis and meiosis), as it contains the genetic material (DNA) necessary for cell division and the inheritance of traits.
During mitosis, the nucleus ensures the accurate replication and division of genetic material into two identical daughter cells. This process involves stages such as prophase, metaphase, anaphase, and telophase.

In meiosis, which produces gametes, the nucleus facilitates the reduction of chromosome numbers and promotes genetic recombination. Prior to both processes, DNA is replicated in the S phase of the cell cycle.

The accurate distribution of genetic material during mitosis and meiosis ensures inheritance of traits and genetic continuity. The nucleus is key to maintaining genetic integrity across cell generations.

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