Which intermediate product is found in all three of the following process
(a) anaerobic respiration
(b) aerobic respiration
(c) photosynthesis

Options

A. succinic acid
B. lactic acid
C. Ri bulose diphosphate
D. Phosphoglyceric acid

Answer

To solve the question of which intermediate product is found in anaerobic respiration, aerobic respiration, and photosynthesis, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Processes**:
- **Anaerobic Respiration**: This process occurs in the absence of oxygen and produces energy using electron acceptors other than oxygen. Common products include lactic acid or ethanol.
- **Aerobic Respiration**: This process requires oxygen to produce energy. It involves the complete oxidation of glucose to carbon dioxide and water, producing ATP.
- **Photosynthesis**: This is the process by which plants convert light energy into chemical energy, producing glucose and oxygen from carbon dioxide and water.

2. **Identify Possible Intermediate Products**:
- We need to identify products that can be intermediates in all three processes. The options provided are:
- Succinic acid
- Lactic acid
- Ribulose bisphosphate (RuBP)
- Phosphoglyceric acid (PGA)

3. **Analyze Each Option**:
- **Succinic Acid**: This is primarily an end product of anaerobic respiration and is not involved in aerobic respiration or photosynthesis. So, it's not the answer.
- **Lactic Acid**: This is a by-product of anaerobic respiration and can occur in some forms of aerobic respiration, but it is not involved in photosynthesis. Thus, it is not the answer.
- **Ribulose Bisphosphate (RuBP)**: This compound is involved in photosynthesis but is not a product of anaerobic or aerobic respiration. Therefore, it is not the answer.
- **Phosphoglyceric Acid (PGA)**: This is an intermediate in both aerobic respiration (as part of the glycolytic pathway) and photosynthesis (as part of the Calvin cycle). It is also involved in the formation of ATP in both processes.

4. **Conclusion**:
- The only product that is found in all three processes (anaerobic respiration, aerobic respiration, and photosynthesis) is **Phosphoglyceric Acid (PGA)**.

### Final Answer:
The intermediate product found in all three processes is **Phosphoglyceric Acid (PGA)**.

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