NEETBotanyCell - The Unit of Life
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): A typical mesophyll cell of a leaf contains both naked, double-stranded circular DNA and histone-associated linear DNA. Reason (R): In a eukaryotic plant cell, the nucleus contains linear DNA, whereas semi-autonomous organelles like chloroplasts and mitochondria possess 70S ribosomes and circular n
Options
- ABoth Assertion and Reason are true but Reason is not the correct explanation of Assertion.
- BBoth Assertion and Reason are true and Reason is the correct explanation of Assertion.
- CAssertion is true but Reason is false.
- DAssertion is false but Reason is true.
Correct answer
B. Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Step-by-step solution
Assertion (A) is true. A mesophyll cell is a eukaryotic plant cell. It contains a well-defined nucleus as well as semi-autonomous organelles (chloroplasts and mitochondria). Reason (R) is also true and correctly explains the Assertion. The nucleus of the mesophyll cell contains linear DNA packaged with histone proteins. At the same time, its chloroplasts and mitochondria contain their own double-stranded, circular, naked DNA along with 70S ribosomes, which resembles prokaryotic genetic material. Therefore, both Ass