Question

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 of the following statements are correct?

• A. Statement (i) is true but (ii) is false
• B. Statement (ii) is true but (i) is false
• C. Both statements are true
• D. Both statements are false

Answer 1

The correct option is (A):

Statement (i):

1. Both mitochondria and chloroplasts contain their own double-stranded circular DNA and ribosomes.
2. The genetic material acts as the extrachromosomal DNA which is responsible for cellular functions.
   
3. The presence of their own machinery for replication and development makes these two organelles of the cell semi-autonomous organelles.
   

​Statement (ii):

1. The mitochondria and chloroplasts are formed through fission from the pre-existing organelles.
   
2. They have protein-synthesizing machinery of their own (ribosomes) that can produce the required proteins from its own genes.
   

Final Answer: Hence, for mitochondria and chloroplasts statement (i) is true but (ii) is false