Question

The influence of light on non-directional movement of organisms is known as:

• A. Phototaxis
• B. Photokinesis
• C. Phototropism
• D. Photoperiodism

Hint:

Photokinesis is observed in insects and microorganisms, where movement depends on light intensity but lacks direction.

Answer 1

The Correct Option is B

Step 1: Understanding Photokinesis

- Photokinesis is the change in movement speed due to light intensity, without directional movement.
- Phototaxis involves movement toward or away from light.
- Phototropism is directional growth toward light (in plants).
- Photoperiodism refers to biological responses to light duration (e.g., flowering).