A) They need light for photosynthesis
B) They need light for respiration
C) Light attracts them
D) Cells on the shaded side elongate more
Correct Answer: D
Solution :
It is due to less auxin towards the lightened side due to photooxidation of auxin. So concentration of auxin is high towards the dark side so growth is high and it bends towards light. * Concept - Curvature means unequal growth, unequal growth is due to unequal distribution of Auxin Unequal distribution of Auxin - due to photooxidation of auxin
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