Plant shoots exhibit positive phototropism by growing towards the light, while their roots exhibit negative phototropism by growing away from light. The hormone auxin directs this process. Auxin increases in concentration on the side of the shoots and the roots that faces away from the light. Auxin has different effects in each of these locations.

What is the best explanation of how auxin directs phototropism in plant shoots?

An auxin, is a plant growth hormone that helps regulate shoot growth. ... But when sunlight varies, auxin is broken down on the sunnier side of the stem. The higher concentration of auxin on the shady side causes the plant cells on that side to grow more so it bends toward the light.

Explanation:

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The auxin grows more growth the shoot growth.When sunlight changes it falls on the brighter side of the plant or stem.

Explanation:

answer; i believe the answer is (polygenic inheritance;