Study the following and pick up the correct statements:
I. Oriented locomotor movement of an organism towards or away from light is called photokinesis
II. Influence of light on non directional movement of organism is known as phototaxis.
III. The orientation to light of a non-motile organism (such as plant or plant part) is known as phototropism.
IV. The response of organisms for the photoperiod is known as photoperiodism.

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I, III

III, IV

II, IV

I, II

answer is B.

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Detailed Solution

I. Oriented locomotor movement of an organism towards or away from light is not photokinesis. Photokinesis refers to the non-directional movement of an organism in response to light intensity, not oriented locomotor movement.
II. The influence of light on non-directional movement of an organism is not phototaxis. Phototaxis involves movement towards (positive phototaxis) or away from (negative phototaxis) a light source.
III. The orientation to light of a non-motile organism (such as a plant or plant part) is known as phototropism.
IV. The response of organisms for the photoperiod is known as photoperiodism.

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