Mitochondria and chloroplast are: (i) Semi – autonomous organelles (ii) Formed by division of pre – existing organelles and they contain DNA but lack protein synthesizing machinery Which one of the following options is correct?
Answer: (C) (i) is true but (ii) is false. Answer: (C) (i) is true but (ii) is false Solution: Mitochondria and chloroplasts are semi-autonomous organelles because both are double-membrane bound, contain their own circular DNA and 70S ribosomes, and divide by fission, so statement (i) is true.
- A.Both (i) and (ii) are correct
- B.(ii) is true but (i) is false
- C.(i) is true but (ii) is false✓
- D.Both (i) and (ii) are false
Correct Answer
(C) (i) is true but (ii) is false
Solution & Explanation
Answer: (C) (i) is true but (ii) is false Solution: Mitochondria and chloroplasts are semi-autonomous organelles because both are double-membrane bound, contain their own circular DNA and 70S ribosomes, and divide by fission, so statement (i) is true. Statement (ii) is false: although they do contain DNA, they are NOT lacking protein-synthesising machinery — the mitochondrial matrix (and chloroplast stroma) possess ribosomes and the components required for protein synthesis. Hence only (i) is correct. NCERT Reference: Ch 8, p.97, lines 13–16: "The matrix also possesses single circular DNA molecule, a few RNA molecules, ribosomes (70S) and the components required for the synthesis of proteins. The mitochondria divide by fission."