The flat structures consisting of cisternae and lying close to nucleus are:-

Options

A. E.R
B. Golgibody
C. Mitochondria
D. Centrosome

Answer

To solve the question regarding the flat structures consisting of cisternae that lie close to the nucleus, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for flat structures that consist of cisternae and are located near the nucleus. Cisternae are membrane-bound compartments that are typically found in certain organelles.

2. **Identifying Key Terms**:
- **Cisternae**: These are flattened membrane-bound sacs.
- **Close to the Nucleus**: This indicates that we are looking for organelles that are situated near the nucleus of the cell.

3. **Analyzing the Options**:
- **Option 1: Endoplasmic Reticulum (ER)**: The ER consists of tubules and is not flat like cisternae. It is also not specifically located close to the nucleus in a flat structure.
- **Option 2: Golgi Bodies**: The Golgi apparatus consists of stacked, flat structures known as cisternae. It is located near the nucleus and is responsible for modifying, sorting, and packaging proteins.
- **Option 3: Mitochondria**: These are not flat structures and are involved in cellular respiration.
- **Option 4: Centrosome**: This structure is involved in cell division and contains centrioles, but it does not consist of cisternae.

4. **Conclusion**: Based on the analysis, the only option that fits the description of flat structures consisting of cisternae and lying close to the nucleus is **Golgi Bodies**.

### Final Answer:
The flat structures consisting of cisternae and lying close to the nucleus are **Golgi Bodies**.

---