Question

How does phototropism occur in plants?

• A. If a plant part moves towards the light,it is called positive phototropism.
• B. If a plant part moves opposite direction of light,it is called positive phototropism.
• C. If a plant part do not move towards the light,it is called positive phototropism.
• D. None of the above.

Answer 1

Answer: (A)

If a plant part moves towards the light,it is called positive phototropism.

• Phototropism is the growth of organisms in response to a stimulus. This causes the plant to have elongated cells on the farthest side from the light. Phototropism is one of the many plant tropisms or movements which respond to external stimuli.
• Growth towards a light source is called positive phototropism, while growth away from light is called negative phototropism. Most plant shoots exhibit positive phototropism, and rearrange their chloroplasts in the leaves to maximize photosynthetic energy and promote growth.
  Hence, option A is correct.