A granum is made up of:

Options

A. Stacks of membrane-bounded, flattened discoid sacs called thylakoids containing the molecules of chlorophyll.
B. A coin-shaped stack of thylakoids, membrane-like structures in the chloroplasts of plant cells. Grana are separately present to form stromal thylakoids.
C. Many thylakoids arranged one beside the other
D. None of the above

Answer

To answer the question "A granum is made up of:", we will follow these steps:

### Step-by-Step Solution:

1. **Understanding Granum**:
- A granum is a structure found within chloroplasts, which are the organelles responsible for photosynthesis in plant cells.

2. **Composition of Granum**:
- A granum consists of multiple thylakoids stacked on top of each other. Thylakoids are membrane-bound structures that are crucial for the photosynthetic process.

3. **Characteristics of Thylakoids**:
- Thylakoids are flattened, disc-shaped sacs that contain chlorophyll, the green pigment essential for capturing light energy during photosynthesis.

4. **Conclusion**:
- Therefore, a granum is made up of a stack of membrane-bounded flattened discoid sacs called thylakoids, which contain molecules of chlorophyll.

### Final Answer:
A granum is made up of a stack of membrane bounded flattened discoid sacs called thylakoids containing the molecules of chlorophyll.

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