Scotoactive movement of stomata is that

Options

A. Stomata open at night
B. Stomata open during day
C. Stomata close at night
D. Stomata open both during day and night .

Answer

To answer the question about scotoactive movement of stomata, let's break it down step by step:

### Step-by-Step Solution:

1. **Understanding Stomata**: Stomata are tiny openings on the surface of leaves that allow for gas exchange (CO2 in, O2 out) and transpiration (water vapor loss).

2. **Types of Stomatal Movement**: Stomata can exhibit different types of movements based on light conditions:
- **Photoactive Movement**: This is when stomata open during the day (in the presence of light) and close at night (in the absence of light).
- **Scotoactive Movement**: This is the opposite, where stomata close during the day and open at night.

3. **Identifying Scotoactive Movement**: The question specifically asks about scotoactive movement. According to the definition, scotoactive movement involves stomata opening at night.

4. **Analyzing the Options**:
- **Option A**: Stomata opens at night (This matches the definition of scotoactive movement).
- **Option B**: Stomata open during the day (This is characteristic of photoactive movement).
- **Option C**: Stomata closes at night (This is also characteristic of photoactive movement).
- **Option D**: Stomata open both during day and night (This does not fit either category).

5. **Conclusion**: Based on the definitions and analysis of the options, the correct answer is **Option A: stomata opens at night**.

### Final Answer:
**Option A: Stomata opens at night.**