Differences between photophosphorylation (PP) and oxidative phosphorylation (OP) is

Options

A. (a) In PP it is the synthesis of ATP while in OP it is of ADP
B. (b) In PP, `O_2` is evolved while in OP `O_2` is used up
C. (c) Both can not take place in light .
D. (d) PP occurs in green leaves while OP cannot occur in green leaves

Answer

### Step-by-Step Text Solution:

1. **Definition of Photophosphorylation (PP) and Oxidative Phosphorylation (OP)**:
- Photophosphorylation is the process of ATP synthesis that occurs during photosynthesis, specifically in the presence of light.
- Oxidative phosphorylation is the process of ATP synthesis that occurs during cellular respiration, which can happen in both light and dark conditions.

2. **Location of Processes**:
- Photophosphorylation occurs in the chloroplasts of plant cells, specifically in the thylakoid membranes.
- Oxidative phosphorylation occurs in the mitochondria of cells.

3. **Source of Energy**:
- Photophosphorylation uses light energy to drive the synthesis of ATP.
- Oxidative phosphorylation uses the energy released from the electron transport chain during the oxidation of nutrients.

4. **Oxygen Dynamics**:
- In photophosphorylation, water is oxidized to release oxygen as a byproduct.
- In oxidative phosphorylation, oxygen is reduced to form water, consuming oxygen in the process.

5. **Overall Function**:
- The main function of both processes is the synthesis of ATP, which is crucial for energy transfer in cells.

6. **Conclusion**:
- The key differences can be summarized as follows:
- Photophosphorylation occurs only in the presence of light, while oxidative phosphorylation can occur in both light and dark.
- Photophosphorylation is part of photosynthesis, while oxidative phosphorylation is part of cellular respiration.
- Oxygen is produced in photophosphorylation and consumed in oxidative phosphorylation.