Dark reaction and light reaction of photosynthesis takes place in

Options

A. stroma and grana of chloroplast respectively
B. grana and stroma of chloroplast respectively grana only
C. grana only
D. stroma only

Answer

### Step-by-Step Text Solution

1. **Understanding Photosynthesis**: Photosynthesis consists of two main processes: the light reaction and the dark reaction (Calvin cycle). Both of these processes occur in the chloroplasts of plant cells.

2. **Identifying the Sites**:
- **Light Reaction**: This process occurs in the thylakoid membranes of the chloroplasts. The light reaction requires light energy, which is absorbed by pigments (such as chlorophyll) located in these membranes.
- **Dark Reaction**: Also known as the Calvin cycle, this reaction takes place in the stroma of the chloroplasts. The dark reaction uses ATP and NADPH produced during the light reaction to convert carbon dioxide into glucose.

3. **Summary of Locations**:
- **Light Reaction**: Takes place in the **thylakoids** of the chloroplasts.
- **Dark Reaction**: Takes place in the **stroma** of the chloroplasts.

4. **Final Answer**: Therefore, the dark reaction occurs in the stroma, and the light reaction occurs in the thylakoids of the chloroplasts.