Question

1. which stimulus causes a responding plant to demonstrate phototropism*?

*phototropism is the ability of a plant to grow in the direction of light.

○ strength of light

○ direction of light

○ length of day

○ time of day

Explanation:

Phototropism is defined as a plant's growth in the direction of light. The stimulus causing this response should relate to the direction of light, as the definition emphasizes growth toward light direction. The other options (strength of light, length of day, time of day) do not align with the definition of phototropism.

Answer:

B. direction of light