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Question

Chloroplast dimorphism is a characteristic feature of


A
Plants with Calvin cycle.
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B
C4 plants.
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C
All plants.
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D
Algae only.
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Solution

The correct option is B C$$_4$$ plants.
In Kranz anatomy, the vascular bundle is surrounded by two rings: Inner ring is bundle sheath cell and outer ring is mesophyll cells. Bundle sheath may be single layered as in Maize or double layered as in sugarcane. If two layered, the outer one is green and the inner one is thick walled and called as mestome sheath. Mesophyll cell chloroplasts are granal and starch lacking but the bundle sheath cell chloroplasts are without grana and rich in starch. Such feature is known as chloroplast dimorphism. Dimorphism of chloroplast is found in C$$_4$$ plants. Thus, the correct answer is option B.

Biology

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