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How does auxin affect the growth of plant stems?

1. It builds up on the side of the stem that is away from the light source and stimulates growth.
2. It builds up on the side of the stem that is away from the light source and inhibits growth.
3. It builds up on the side of the stem that faces the light source and stimulates growth.
4. It builds up on the side of the stem that faces the light source and inhibits growth.

1 answer

The correct explanation of how auxin affects the growth of plant stems is:

  1. 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. When light is directed towards one side of the plant stem, auxin redistributes itself to the shaded side (the side away from the light). This concentration of auxin on the shaded side promotes cell elongation, causing the stem to bend towards the light source.