Consider the following structures
Nerve cells
Sensory cells
Interstitial cells
Cnidoblast
Gland cells
How many of above are common in epidermis and gastrodermis of coelenterates?

Options

A. A,B and C
B. D and E
C. A,B,C and E
D. A,C and E

Answer

To solve the question regarding how many of the listed cell types are common in the epidermis and gastrodermis of coelenterates, we will analyze each cell type and determine their presence in both layers.

### Step-by-Step Solution:

1. **Identify the Layers**:
- Coelenterates, also known as cnidarians, have two main layers: the outer layer called the epidermis and the inner layer called the gastrodermis.

2. **List the Cell Types**:
- The cell types provided in the question are:
- Nerve cells
- Sensory cells
- Interstitial cells
- Cnidoblast (also known as nematocysts)
- Gland cells

3. **Analyze Each Cell Type**:
- **Nerve Cells**: Present in both the epidermis and gastrodermis.
- **Sensory Cells**: Present in both the epidermis and gastrodermis.
- **Interstitial Cells**: Present in both the epidermis and gastrodermis.
- **Cnidoblast**: Present only in the epidermis, not in the gastrodermis.
- **Gland Cells**: Present only in the gastrodermis, not in the epidermis.

4. **Count the Common Cell Types**:
- The common cell types identified are:
- Nerve cells
- Sensory cells
- Interstitial cells
- Total common cell types: 3

5. **Conclusion**:
- Therefore, the number of structures that are common in the epidermis and gastrodermis of coelenterates is **3**.