Alage used by Calvin and associates for photosynthetic reserch is
or
The experimental material that has largely been responsible for the making rapiad advances in research on photosynthesis is
or
Warbug studied his effect on .

Options

A. Chlamydomonas
B. Chlorella
C. Spinach leaf
D. Hydrilla.

Answer

To answer the question regarding the algae used by Calvin and associates for photosynthetic research, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Context**: The question is asking about the specific algae used in photosynthetic research by Calvin and his associates.

2. **Consider the Options**: The options provided are:
- Chalidochlamydomonas
- Chlorella
- Spinach
- Hydrilla

3. **Research on Algae**: Among these options, we need to determine which one is most commonly associated with Calvin's research.

4. **Focus on Chlorella**: Chlorella is a genus of single-celled green algae that is known for its rapid growth and high chlorophyll content. It is widely used in research due to its ability to perform photosynthesis efficiently.

5. **Significance of Chlorella**: Chlorella contains both chlorophyll A and B, which are essential for photosynthesis. It can utilize carbon dioxide, water, sunlight, and a few minerals to grow, making it an excellent model organism for studying photosynthesis.

6. **Conclusion**: Based on the information, the algae used by Calvin and associates for photosynthetic research is **Chlorella**.

### Final Answer:
The algae used by Calvin and associates for photosynthetic research is **Chlorella**.

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