Question

If a plant is grown in the absence of gravity, which type of phototropism will its roots exhibit, and where will auxin accumulate?(1 point)
A.negative phototropism; auxin will accumulate on the side nearest to the light source
negative phototropism; auxin will accumulate on the side nearest to the light source

B.positive phototropism; auxin will accumulate on the side away from the light source
positive phototropism; auxin will accumulate on the side away from the light source

C.negative phototropism; auxin will accumulate on the side away from the light source
negative phototropism; auxin will accumulate on the side away from the light source

D.positive phototropism; auxin will accumulate on the side nearest to the light source
positive phototropism; auxin will accumulate on the side nearest to the light source

Answer 1

Phototropism refers to the growth or movement of an organism (often a plant) in response to light stimulus. Negative phototropism occurs when an organsim grows away from specific chemicals.

• If a plant is grown in the absence of gravity, its roots will exhibit negative phototropism and auxin hormones will accumulate on the side away from the light source (Option C is correct).

• In this case, negative phototropism occurs in response to auxin hormones.

• On the other hand, positive phototropism occurs when a plant grows towards the light source.

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