Question

What causes a green plant exposed to the light on only one side to bend toward the source of light as it grows?

• A. Auxin accumulates on the shaded side, stimulating greater cell elongation there.
• B. Green plants need light to perform photosynthesis.
• C. Green plants seek light because they are phototropic.
• D. Light stimulates plant cells on the lighter side to grow faster.

Answer 1

The correct option is A

Auxin accumulates on the shaded side, stimulating greater cell elongation there.

Auxin accumulates on the shaded side, stimulating greater cell elongation there. This means that the shaded side grows longer, causing the shoot to bend towards the light.