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

**Step-by-Step Solution:**

1. **Understanding Chloroplast Structure**:
- Chloroplasts are double-membraned organelles found in plant cells. They contain chlorophyll, the green pigment essential for photosynthesis.

2. **Membrane System of Chloroplast**:
- The chloroplast consists of thylakoids (stacks of membranes called grana) and stroma (the fluid-filled space surrounding the thylakoids).

3. **Photosynthesis Process**:
- Photosynthesis occurs in two main stages: the light reactions and the dark reactions (Calvin cycle).
- The light reactions take place in the thylakoids, where light energy is captured and converted into chemical energy (ATP and NADPH).
- The dark reactions occur in the stroma, where ATP and NADPH are used to fix carbon dioxide and synthesize sugars.

4. **Analyzing the Options**:
- **Option A**: Trapping light energy - This is directly involved in the light reactions occurring in the thylakoids.
- **Option B**: Synthesis of ATP and NADPH - This is also a direct result of the light reactions in the thylakoids.
- **Option C**: Enzymatic reaction for synthesis of sugar - This occurs in the stroma during the dark reactions, which do not involve the thylakoid membrane system directly.

5. **Conclusion**:
- The membrane system of chloroplasts (thylakoids) is not directly involved in the enzymatic reactions for the synthesis of sugar, which occur in the stroma.

**Final Answer**: The membrane system of chloroplast is not directly involved in the enzymatic reaction for the synthesis of sugar.

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