A structure not present in Hydra occur in maximum number over

Options

A. Never cells
B. Epitheliomuscular cells
C. Choanocytes/Glial cells
D. Cnidocytes.

Answer

To solve the question "A structure not present in Hydra occurs in maximum number over," we will analyze each option provided and determine which structure is absent in Hydra.

### Step-by-Step Solution:

1. **Understanding Hydra**:
- Hydra is a freshwater organism that belongs to the phylum Cnidaria. It is known for its simple body structure and ability to regenerate.

2. **Analyzing the Options**:
- **Option 1: Nerve Cell**:
- Nerve cells are present in Hydra, particularly in the head region where they help in coordinating movements. Thus, this option is incorrect.

- **Option 2: Epithelial Muscular Cell**:
- Epithelial muscular cells are also present in Hydra. They play a crucial role in contraction and movement. Therefore, this option is also incorrect.

- **Option 3: Choanocyte (or Glial Cell)**:
- Choanocytes are specialized cells found in sponges. They are flagellated cells with a collar of protoplasm, which helps in feeding and water circulation. Since Hydra does not have choanocytes, this option is correct as it identifies a structure not present in Hydra.

- **Option 4: Nidocytes**:
- Nidocytes (or nematocysts) are specialized stinging cells found in Hydra that help in capturing prey. Since these cells are present in Hydra, this option is incorrect.

3. **Conclusion**:
- The structure that is not present in Hydra and occurs in maximum number in other organisms is **Choanocyte (or Glial Cell)**. Therefore, the correct answer is **Option 3**.

### Final Answer:
**Choanocyte (or Glial Cell)** is the structure not present in Hydra that occurs in maximum number over.

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