A: Chloroplast is a semi-autonomous organelle | vedclass

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(B) Chloroplasts are considered semi-autonomous organelles because they contain their own circular $DNA$ and $70S$ ribosomes,which allow them to synth

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Assertion and Reason both are correct but Reason is not the correct explanation of Assertion.

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(B) Chloroplasts are considered semi-autonomous organelles because they contain their own circular $DNA$ and $70S$ ribosomes,which allow them to synthesize some of their own proteins.The ribosomes found in chloroplasts are $70S$ type,whereas the ribosomes found in the cytoplasm of eukaryotic cells are $80S$ type.Since $70S$ ribosomes are smaller than $80S$ ribosomes,the Reason is correct.However,the fact that chloroplast ribosomes are smaller is not the reason why the chloroplast is semi-autonomous; rather,the presence of its own genetic material $(DNA)$ and protein-synthesizing machinery makes it semi-autonomous.Therefore,both statements are correct,but the Reason is not the correct explanation of the Assertion.

$A$: Chloroplast is a semi-autonomous organelle.
$R$: The ribosomes of the chloroplast are smaller than cytoplasmic ribosomes.

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$A$: Chloroplast is a semi-autonomous organelle.$R$: The ribosomes of the chloroplast are smaller than cytoplasmic ribosomes.