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): Chloroplasts are considered semi-autonomous organelles. Reason (R): Chloroplasts possess their own single circular double-stranded DNA molecule and 70S ribosomes, allowing them to synthesize some of their required proteins. In the light of the above statements, choose the most appropriate answer fr
Options
- ABoth (A) and (R) are true but (R) is not the correct explanation of (A).
- BBoth (A) and (R) are true and (R) is the correct explanation of (A).
- C(A) is true but (R) is false.
- D(A) is false but (R) is true.
Correct answer
B. Both (A) and (R) are true and (R) is the correct explanation of (A).
Step-by-step solution
Chloroplasts (along with mitochondria) are unique among eukaryotic organelles because they possess their own genetic material and protein synthesis machinery. The stroma of chloroplasts contains small, single, circular, double-stranded DNA molecules and 70S ribosomes. This allows them to synthesize some of the proteins required for their functioning, making them semi-autonomous organelles. Therefore, both Assertion (A) and Reason (R) are true, and (R) is the correct explanation of (A). Answer: Both (A) and (R) are