Katusky effect is

Options

A. Photoluminescence in the absence of photosynthesis
B. Outburst of fluorescence at the end of illumination
C. Outburst of fluorescence during first few moment of illumination
D. Bioluminescence at night

Answer

**Step-by-Step Solution:**

1. **Understanding the Kartusky Effect**: The Kartusky effect is related to the process of photosynthesis in green plants, specifically concerning the fluorescence emitted by chlorophyll when exposed to light.

2. **Analyzing the Options**:
- **Option 1**: Photoluminescence in the absence of photosynthesis. This is incorrect because photoluminescence occurs in the presence of light, which is essential for photosynthesis.

- **Option 2**: Outburst of fluorescence at the end of illumination. This is also incorrect. At the end of illumination, fluorescence typically drops to zero, meaning no outburst occurs.

- **Option 3**: Outburst of fluorescence during the first few moments of illumination. This is the correct option. During the initial moments of light exposure, there is a significant burst of fluorescence, indicating the activation of photosynthesis.

- **Option 4**: Why only sends at night. This statement is incorrect as it does not relate to the Kartusky effect.

3. **Conclusion**: Based on the analysis of the options, the correct answer is **Option 3**: "Outburst of fluorescence during the first few moments of illumination is known as Kartusky effect."

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