Question

In strong light, chloroplasts are arranged along the lateral walls of palisade cells. The condition is called

• A. Parastrophe
• B. Epistrophe
• C. Apostrophe
• D. Positive heliotropism

Answer 1

The correct option is A Parastrophe

Like phototaxis, chloroplasts also show movement with related to the light source. In dark, chloroplasts are arranged randomly. This is called as apostrophe. In weak light, they are arranged on the upper surface of palisade cells. This is called as epistrophe. In strong light, they are arranged along the lateral walls of palisade cells. This is called as parastrophe. It is caused by both blue and red light.

Thus, the correct answer is option A.