NADP reduces to `NADPH_(2)` in

Options

A. Hatch and Slack
B. Robert Hill
C. Hens kerbs
D. Melvin kelvin

Answer

To answer the question "NADP reduces to NADPH2 in," we need to analyze the given options and understand the context of photosynthesis, particularly focusing on where NADP is reduced to NADPH2.

### Step-by-Step Solution:

1. **Understanding Photosynthesis**: Photosynthesis occurs in two main stages: the light-dependent reactions and the light-independent reactions (Calvin cycle). The light-dependent reactions take place in the thylakoid membranes of chloroplasts and involve the absorption of sunlight.

2. **Role of NADP**: During the light-dependent reactions, sunlight energy is used to split water molecules (photolysis), releasing oxygen and generating high-energy electrons. These electrons are transferred through an electron transport chain.

3. **Reduction of NADP**: At the end of the electron transport chain, the electrons are used to reduce NADP+ (nicotinamide adenine dinucleotide phosphate) to NADPH2. This reduction is crucial as NADPH2 serves as a reducing agent in the Calvin cycle.

4. **Identifying the Correct Pathway**: The options provided are:
- Hatch and Slack
- Robert Hill
- Hans Krebs
- Melvin Calvin

5. **Analyzing Each Option**:
- **Hatch and Slack**: This pathway is related to C4 photosynthesis and involves carbon fixation, not the reduction of NADP.
- **Robert Hill**: He is known for the Hill reaction, which describes the light-driven transfer of electrons from water to NADP+, resulting in the formation of NADPH2. This is directly related to the reduction of NADP.
- **Hans Krebs**: He discovered the Krebs cycle, which is not directly involved in photosynthesis.
- **Melvin Calvin**: He is known for the Calvin cycle, which is the light-independent phase of photosynthesis and does not involve the reduction of NADP.

6. **Conclusion**: The correct answer to the question is **Robert Hill**, as he demonstrated the process where NADP is reduced to NADPH2 during the light-dependent reactions of photosynthesis.

### Final Answer:
NADP reduces to NADPH2 in **Robert Hill**.