Which is false ?

Options

A. Flow of electrons from water to `NADP^(+)` is non-cyclic and
produces `ATP`
B. Light energy for photolysis of water comes from reaction centre
of PS II
C. Two photosystems are needed for reduction of `NADP^(+)`
D. `P_(680)` and `P_(700)` are reaction centres of PS I and PS II respectively

Answer

To determine which statement is false regarding photosynthesis, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement Analysis**:
- **Statement 1**: "Flow of electrons from water to NADP+ is non-cyclic and produces ATP."
- This statement is true. The flow of electrons from water (H2O) to NADP+ occurs during non-cyclic photophosphorylation, which is part of the light-dependent reactions of photosynthesis. This process does produce ATP.

2. **Statement 2**: "Light energy of photolysis of water comes from the reaction center of PSII."
- This statement is also true. The photolysis of water, which produces oxygen, protons, and electrons, is driven by light energy absorbed by Photosystem II (PSII). The oxygen-evolving complex associated with PSII facilitates this process.

3. **Statement 3**: "Two photosystems are needed for the reduction of NADP+."
- This statement is true as well. Both Photosystem I (PSI) and Photosystem II (PSII) are involved in the reduction of NADP+ to NADPH. The electrons from PSII are transferred to PSI, which ultimately leads to the reduction of NADP+.

4. **Statement 4**: "P680 and P700 are reaction centers of PS1 and PS2 respectively."
- This statement is false. P700 is the reaction center of Photosystem I (PSI), while P680 is the reaction center of Photosystem II (PSII). Therefore, the correct association is that P680 corresponds to PSII and P700 corresponds to PSI.

### Conclusion:
The false statement is:
- **D**: "P680 and P700 are reaction centers of PS1 and PS2 respectively."