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Question

The movement of motile algae towards the region of optimum light is called

A
Phototropic
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B
Phototaxis
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C
Photonasty
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D
Photosynthetic
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Solution

The correct option is B Phototaxis
The ability of organisms to respond to light is called phototaxis. Motile algae such as Euglena, Chlamydomonas and Volvox show phototaxis. These organisms have rhodopsin that allows themto detect and move towards a light source and optimize light absorption for photosynthesis. Thus the correct answer is option B.

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