Question

A sunflower turns its head toward sunlight. What triggers this behavior in a sunflower?

Answer 1

Answer: Option (b) is the correct answer.

Explanation:

Phototropism is defined as the ability of a plant to either respond to light or does not respond to light.

When a plant respond to light then it is known as positive phototropism and when a plant does not respond to light then it is known as negative phototropism.

Therefore, when a sunflower turns its head towards sunlight then it means sunflower is responding to light.

Thus, we can conclude that phototropism triggers this behavior in a sunflower.

Answer 2

The answer is phototropism, which is the growth of an organism responding to the presence of light.