Dark reaction of photosynthesis occurs in

Options

A. grana of chloroplast
B. stroma of chloroplast
C. matrix of mitochondrion
D. cytoplasm

Answer

**Step-by-Step Solution:**

1. **Understanding Photosynthesis**: Photosynthesis is a crucial process in plants that converts light energy into chemical energy. It consists of two main stages: the light-dependent reactions and the light-independent reactions (dark reactions).

2. **Defining Dark Reactions**: The dark reactions, also known as the Calvin cycle or C3 cycle, do not require light directly. They can occur during the day or night, as they utilize the products generated from the light-dependent reactions.

3. **Location of Dark Reactions**: The dark reactions take place in the stroma of the chloroplasts. The stroma is the fluid-filled space surrounding the thylakoids in the chloroplasts where the Calvin cycle occurs.

4. **Energy Molecules Used**: The dark reactions utilize energy molecules such as ATP and NADPH, which are produced during the light-dependent reactions. These molecules provide the necessary energy and reducing power for the synthesis of glucose from carbon dioxide.

5. **Conclusion**: Therefore, the dark reactions of photosynthesis occur in the stroma of chloroplasts.

**Final Answer**: The dark reaction of photosynthesis occurs in the stroma of chloroplasts.

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