Skototropic movements are induced by

Options

A. Night
B. Light
C. Touch
D. Heat.

Answer

**Step-by-Step Solution:**

1. **Understanding Scototropic Movements:**
- Scototropic movements refer to the growth responses of plants in the absence of light. This is a type of movement that occurs when there is no illumination.

2. **Identifying the Type of Movement:**
- Scototropic movements can be classified as negative phototropism. Negative phototropism is when a plant grows away from light sources.

3. **Analyzing the Options:**
- The question provides four options: night, light, touch, and heat.
- We need to determine which of these options induces scototropic movements.

4. **Evaluating Each Option:**
- **Night:** While night signifies the absence of light, it does not directly induce scototropic movements.
- **Light:** Light is a crucial factor in determining the direction of plant growth. In the absence of light, plants exhibit scototropic movements.
- **Touch:** Touch does not induce scototropic movements; it is related to other types of movements such as thigmotropism.
- **Heat:** Heat does not play a role in scototropic movements.

5. **Conclusion:**
- The correct answer is **light** since scototropic movements occur in response to the absence of light, indicating a negative phototropic response.

**Final Answer:**
Scototropic movements are induced by **light**.

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