Question

9. ASSERTION: Chromosomes are constituted by DNA and protein. REASON: These are thread-like structures present in the nucleus. 1. If both assertion and reason are true and the reason is the correct explanation of assertion. 2. If both assertion and reason are true, but the reason is not the correct explanation of assertion. 3. If the assertion is true, but the reason is false. 4. If both assertion and reason are true.

Answer 1

Both the assertion and the reason are TRUE statements, but the reason is not the correct explanation of the assertion.

• The genetic material DNA condenses during the prophase of the cell cycle.
• This condensed nucleic acid binds with histone proteins and forms the compactly packed structure called chromosomes.
• The chromosomes further condensed to chromatin fibers.
• The chromosomes are thick, compact, coiled, and thread-like structures.
• The histone proteins help in the compact wrapping of chromosomes.
• Since the reason is not able to explain the assertion. Hence, the correct answer is option (2).

Answer 2

Answer:

2. Both the Assertion and the Reason are true but the Reason is not the correct explanation of the Assertion.

Explanation:

ASSERTION: Chromosomes are constituted by DNA and protein. Is True as the chromosomes are made up of DNA and histone-like proteins. Inside the chromosome, the negatively charged DNA molecule is wrapped around the positively charged histone octamer to form a structure called a nucleosome.

REASON: These are thread-like structures present in the nucleus. is True as the chromosome are thread-like structures present inside the nucleus of the cell and contain genetic information that is transferred from parents to the next generation.

Hence, both the Assertion and the Reason are true but the Reason is not the correct explanation of the Assertion.