Question

Assertion :Chloroplasts and mitochondria are semi-autonomous bodies. Reason: Chloroplasts and mitochondria have their own DNA and protein synthesizing machinery

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

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Semi autonomous organelles are organelles with DNA. In eukaryotic cells, mitochondrion and chloroplast are semi autonomous organelles as it posses its own DNA. Majority of proteins needed for these organelles are coded by DNA or genes in the nucleus. Only few proteins are coded by organellar DNA. That is why these organelles are called semi autonomous organelles.

Some organelles enjoy some amount of autonomy or independence like in growth, division, production of some enzymes, hence called as semiautonomous organelles and Mitochondria and chloroplast fall in this category. They are able to do this because they have their own DNA/ genome. Both the organelles are also known to have evolved from free living prokaryotes.

So, correct answer is option A.