Question

Assertion: Mitochondria and chloroplast are semiautonomous organelles.

Reason: They are formed by division of preexisting organelles as well as contain DNA but lack protein-synthesizing machinery.

• A. Both assertion and reason are incorrect
• B. Assertion is correct but the reason is incorrect
• C. Both assertion and reason are correct and the reason is the correct explanation for the assertion
• D. Both assertion and reason are correct but the reason is not the correct explanation for the assertion

Answer 1

The correct option is B

Assertion is correct but the reason is incorrect

The correct option is B.

Assertion statement:

1. The mitochondria and chloroplasts are the semi-autonomous organelles.
2. Both the organelles comprise their DNA, which can replicate independently.
3. They are considered semi-autonomous as they are controlled by the nucleus of the cell and are also reliant upon the accessibility of materials present in the cytoplasm.
4. Mitochondria are considered the powerhouse of the cell as it assists in the production of ATP molecules.
5. The chloroplasts are found only in plant cells and in some algae, it comprises a green-colored pigment known as chlorophyll, which assists in the process of photosynthesis.

Reason statement:

1. Both mitochondria and chloroplasts are the semi-autonomous organelles, which comprise their DNA and protein-synthesizing apparatus, that is, ribosomes.
2. These organelles originated from the division of pre-existing organelles.

Final answer: Assertion is correct but the reason is incorrect.