Which of the following is not related to the non-cyclic process of light reaction ?

Options

A. The process involves both the photosystems which are interconnected by the ETS.
B. It results only in the synthesis of ATP, but not of `NADPH + H^+`.
C. The membranes of the stroma lamellae lacked PS II.
D. Photolysis of water is essential for it.

Answer

To solve the question "Which of the following is not related to the non-cyclic process of light reaction?", we will analyze each option provided in the context of the non-cyclic light reaction, often referred to as the Z-scheme.

### Step-by-Step Solution:

1. **Understanding Non-Cyclic Light Reaction**:
- The non-cyclic light reaction involves two photosystems (PSI and PSII) and is characterized by the flow of electrons from water to NADP+, resulting in the production of ATP and NADPH.

2. **Analyzing Option 1**:
- Option 1 states that the process involves both photosystems interconnected by the electron transport system (ETS).
- This is true as both PSII and PSI are indeed involved in the non-cyclic light reaction.
- **Conclusion**: This option is related to the non-cyclic process.

3. **Analyzing Option 2**:
- Option 2 claims that it results only in the synthesis of ATP, but not NADPH.
- This is incorrect because the non-cyclic light reaction produces both ATP and NADPH.
- **Conclusion**: This option is NOT related to the non-cyclic process.

4. **Analyzing Option 3**:
- Option 3 mentions that the membrane of the stromal lamella lacks PSII.
- This statement is false because PSII is present in the thylakoid membranes, not in the stromal lamella.
- **Conclusion**: This option is related to the non-cyclic process as it incorrectly describes the presence of PSII.

5. **Analyzing Option 4**:
- Option 4 states that photolysis of water is essential for the non-cyclic process.
- This is true as the splitting of water (photolysis) is a crucial step in the non-cyclic light reaction, providing electrons to PSII.
- **Conclusion**: This option is related to the non-cyclic process.

### Final Answer:
The option that is **not related** to the non-cyclic process of light reaction is **Option 2**.

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