Variegated leaf experiment demonstrates that

Options

A. Water is necessary for Photosynthesis
B. Carbon dioxide is necessary for Photosynthesis
C. Oxygen is necessary for Photosynthesis
D. Chlorophyll necessary for Photosynthesis

Answer

### Step-by-Step Solution:

1. **Understanding the Variegated Leaf Experiment**:
- The variegated leaf experiment involves using a leaf that has both green (chlorophyll-containing) and non-green (lacking chlorophyll) areas.

2. **Setting Up the Experiment**:
- A variegated leaf is taken, and one part of the leaf is covered with black paper to prevent sunlight from reaching it. The other part remains exposed to sunlight.

3. **Observation During the Experiment**:
- After a period of exposure to sunlight, the leaf is tested for the presence of starch, which is an indicator of photosynthesis.

4. **Analyzing the Results**:
- The part of the leaf that was exposed to sunlight (the green area) will show the presence of starch, indicating that photosynthesis occurred there.
- The part of the leaf that was covered (the non-green area) will not show any starch, indicating that photosynthesis did not occur there.

5. **Conclusion**:
- Since photosynthesis only occurred in the green area of the leaf, this demonstrates that chlorophyll is necessary for photosynthesis. The non-green area, lacking chlorophyll, could not perform photosynthesis.

### Final Answer:
The variegated leaf experiment demonstrates that **chlorophyll is necessary for photosynthesis**.

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