The membrane system of chloroplast is not directly involved in :

Options

A. Trapping the light energy
B. Synthesis of ATP & NADPH
C. Enzymatic reactions for synthesis of sugar
D. Both (1) and (2)

Answer

To solve the question regarding the involvement of the membrane system of chloroplasts in various processes, we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Understanding the Membrane System of Chloroplasts:**
- The membrane system of chloroplasts primarily consists of the thylakoid membranes, where various components such as photosystems, ATP synthase, and electron transport chains are located.

2. **Identifying Processes Involving the Membrane System:**
- **Trapping Light Energy:** This process occurs in the thylakoid membranes where photosystems I and II absorb light energy. Photosystem II (P680) captures light energy and transfers it to Photosystem I (P700), which ultimately leads to the formation of NADPH.
- **Synthesis of ATP:** The thylakoid membrane is also involved in ATP production through the electron transport chain. The movement of protons across the thylakoid membrane creates a proton gradient that drives ATP synthase to produce ATP.

3. **Identifying the Process Not Involving the Membrane System:**
- **Enzymatic Reactions for Synthesis of Sugar:** The synthesis of sugars, specifically during the Calvin cycle, occurs in the stroma of the chloroplast, which is outside the thylakoid membranes. This process does not directly involve the membrane system.

4. **Conclusion:**
- Based on the analysis, the membrane system of chloroplasts is not directly involved in the enzymatic reactions for the synthesis of sugars. Therefore, the correct answer is that the membrane system of chloroplasts is not directly involved in enzymatic reactions for the synthesis of sugar.

### Final Answer:
The membrane system of chloroplast is not directly involved in enzymatic reactions for synthesis of sugar.

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