Of which cell organelle is grana a part ?

Options

A. Mitochondria
B. Chloroplast
C. Aleurone grain
D. Starch grain

Answer

### Step-by-Step Solution:

1. **Understanding Grana**: Grana are structures found within certain cell organelles that play a crucial role in photosynthesis. They are specifically involved in the light-dependent reactions of this process.

2. **Identifying the Function of Grana**: Grana contain chlorophyll, the pigment responsible for capturing sunlight. This light energy is then used to excite electrons, which are essential for the photosynthesis process.

3. **Distinguishing Between Cell Organelles**: The question asks to identify which cell organelle contains grana. The options include mitochondria, Luron grain, starch grain, and chloroplast.

4. **Analyzing the Options**:
- **Mitochondria**: This organelle is involved in cellular respiration, not photosynthesis, and does not contain grana.
- **Luron grain**: This is not a recognized cell organelle associated with photosynthesis.
- **Starch grain**: While starch grains are related to storage, they do not contain grana.
- **Chloroplast**: This organelle is known for its role in photosynthesis and contains both grana and stroma.

5. **Conclusion**: Based on the analysis, the correct answer to the question is that grana are a part of the chloroplast.

### Final Answer:
Grana are a part of the chloroplast.