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Q.

When illuminated by unilateral light, coleoptiles of canary grass will show:

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a

Bending away from the light source

b

Bending towards the light source 

c

Bending in any random direction

d

Will not show any bending in response to light stimulus

answer is B.

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Detailed Solution

Charles Darwin and his son Francis Darwin experimented on coleoptiles of canary grass. They observed that coleoptiles responded to the unilateral illumination by growing towards the light source. This phenomenon is termed as phototropism.

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