3-phosphoglyceric acid as first `CO_(2)` fixation product in algal photosynthesis was discovered by

Options

A. Priestley
B. Ingenhousz
C. Engelman
D. Calvin.

Answer

To solve the question regarding who discovered 3-phosphoglyceric acid as the first CO2 fixation product in algal photosynthesis, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Key Concept**: The question is asking about the discovery of 3-phosphoglyceric acid (3-PGA) as the first product of CO2 fixation in algal photosynthesis.

2. **Recall Historical Context**: The discovery of the first product of CO2 fixation in photosynthesis is a significant milestone in plant physiology and biochemistry.

3. **Recognize the Scientists Involved**: The video mentions several scientists: Priestly, Inge's house, Algerman, and Kelvin. However, we need to focus on the correct one related to the discovery of 3-PGA.

4. **Identify the Correct Scientist**: According to the video transcript, the scientist who discovered 3-phosphoglyceric acid as the first CO2 fixation product in algal photosynthesis is Kelvin.

5. **Understand the Method Used**: The discovery was facilitated by the use of radioactive carbon-14 (14C) in studies of algal photosynthesis, which helped in tracing the incorporation of CO2 into organic compounds.

6. **Conclude the Answer**: Therefore, the correct answer to the question is that 3-phosphoglyceric acid as the first CO2 fixation product in algal photosynthesis was discovered by Kelvin.

### Final Answer:
3-phosphoglyceric acid as the first CO2 fixation product in algal photosynthesis was discovered by Kelvin.

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