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How does auxin affect the growth of plant stems?

a. It builds on the side of the stem that is away from the light source and inhibits growth
b. It builds up on the side of the stem that faces the light source and inhibits growth
c. It builds on the side of the stem that faces the light source and stimulates growth
d. It builds up on the side of the stem that is away from the light source and stimulates growth

1 answer

The correct answer is:

d. It builds up on the side of the stem that is away from the light source and stimulates growth.

This phenomenon is known as phototropism. Auxin is a plant hormone that promotes cell elongation. In the case of phototropism, when light is detected by the plant, auxin accumulates on the side of the stem that is away from the light. This results in increased cell elongation on that side, causing the plant stem to bend towards the light source.