A) Photomorphogenesis
B) Photoperiodism
C) Phototropism
D) Photorespiration
Correct Answer: C
Solution :
When a plant organ curves due to unilateral light stimulus, it is called phototropism. Some parts of the plants like stem moves towards light, these organs are called positively phototropic. Some other organs like roots move away from light and they are called negatively phototropic. Phototropism of stem and roots are due to differential hormonal effect. Mechanism is believed to be Cholodny-Went theory, which states that unilateral light produces more auxin (IAA) and, hence more growth on the shaded side resulting in bending.
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