[A]: The energy capturing part of photosynthesis occurs in thylakoid membranes and can not proceed without solar energy.
[R]: The synthesis part of photosynthesis occurs in the stroma and does not require direct light energy.

Options

A. If both A and R are true and R is the correct explanation of A
B. If both A and R are true but R is not the correct explanation of A
C. If A is true and R is false
D. If both A and R are false

Answer

To analyze the assertion and reasoning provided in the question, we will break down each part step by step.

### Step 1: Understanding the Assertion
The assertion states: "The energy capturing part of photosynthesis occurs in thylakoid membranes and cannot proceed without solar energy."

- **Explanation**: This assertion is correct. The thylakoid membranes, which are located within the chloroplasts of plant cells, are where the light-dependent reactions of photosynthesis take place. These reactions require solar energy to convert light into chemical energy in the form of ATP and NADPH.

### Step 2: Understanding the Reasoning
The reasoning states: "The synthesis part of photosynthesis occurs in the stroma and does not require direct light energy."

- **Explanation**: This reasoning is also correct. The stroma is the fluid-filled space surrounding the thylakoids in the chloroplasts where the light-independent reactions (Calvin cycle) occur. These reactions use the ATP and NADPH produced in the light-dependent reactions to synthesize glucose from carbon dioxide. Importantly, these reactions do not require direct light energy.

### Step 3: Evaluating the Relationship Between Assertion and Reasoning
Now, we need to determine if the reasoning correctly explains the assertion.

- **Analysis**: While both the assertion and reasoning are true statements about photosynthesis, the reasoning does not directly explain the assertion. The assertion focuses on the light-dependent reactions occurring in the thylakoid membranes, while the reasoning discusses the light-independent reactions occurring in the stroma. Therefore, the reasoning does not provide a correct explanation for the assertion.

### Conclusion
Based on the analysis:
- The assertion is true.
- The reasoning is true, but it does not explain the assertion.
- Therefore, the correct answer is that the assertion is true, and the reasoning is also true, but it does not provide a correct explanation for the assertion.

### Final Answer
- **Assertion (A)**: True
- **Reasoning (R)**: True but not a correct explanation of (A)