Question

Which of the following phenomena refers to the growth movement of plants in response to light?

• A. Photoperiodism
• B. Phototropism
• C. Long day plants
• D. Short day plants

Hint:

Phototropism:
- Growth towards light (positive).
- Caused by auxin redistribution.
- Example: Sunflower bending towards the sun.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
This question tests knowledge of plant growth movements in response to light.

Step 2: Detailed Explanation:
Phototropism (B) is the growth movement of plants in response to light.
Plants bend towards the light source (positive phototropism) or away from it (negative phototropism).
This is caused by the differential distribution of auxin.
Other terms:
- Photoperiodism (A): Response to day length (flowering).
- Long day plants (C): Plants that flower when day length is longer than a critical duration.
- Short day plants (D): Plants that flower when day length is shorter than a critical duration.
Thus, phototropism is the growth movement in response to light.

Step 3: Final Answer:
Thus, phototropism refers to growth movement in response to light, which corresponds to option (B).
[0.5cm]