Identify the site for the occurrence of dark reactions in chloroplast.

Options

A. Carotene
B. Stroma
C. Thylakoids
D. Double membrane

Explanation

**Step-by-Step Solution:**

1. **Understanding Chloroplast Structure**: Chloroplasts are the organelles in plant cells where photosynthesis occurs. They consist of two main parts: the thylakoids and the stroma.

2. **Identifying the Types of Reactions**: Photosynthesis involves two types of reactions:
- **Light Reactions**: These occur in the thylakoids and require light. They produce energy carriers like ATP and NADPH.
- **Dark Reactions** (Calvin Cycle): These occur in the absence of light and do not directly require sunlight. They utilize the energy carriers produced in the light reactions to synthesize glucose.

3. **Locating the Dark Reactions**: The dark reactions take place in the stroma of the chloroplast. The stroma is the fluid-filled space surrounding the thylakoids.

4. **Conclusion**: Therefore, the site for the occurrence of dark reactions in chloroplasts is the stroma.

**Final Answer**: The dark reactions occur in the stroma of the chloroplast.

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