Nerve cells of coelenterates is

Options

A. Apolar
B. Unipolar
C. Bipolar
D. Multipolar.

Answer

**Step-by-Step Solution:**

1. **Understanding Nerve Cells**: Nerve cells, or neurons, can be classified into different types based on their structure. The four main types are apolar, unipolar, bipolar, and multipolar.

2. **Types of Nerve Cells**:
- **Apolar Neurons**: These neurons have no differentiation in structure; they consist solely of a cell body without any distinct dendrites or axons.
- **Unipolar Neurons**: These have a single process extending from the cell body, which branches into two parts: one acts as a dendrite and the other as an axon.
- **Bipolar Neurons**: These neurons have two distinct processes: one dendrite and one axon, with the cell body situated between them.
- **Multipolar Neurons**: These consist of one cell body and multiple dendrites extending from it, allowing for integration of a large amount of information.

3. **Nerve Cells in Coelenterates**: Coelenterates, which include organisms like jellyfish and corals, possess a unique nerve structure known as a "nerve net." This nerve net is not organized into distinct pathways like in higher organisms.

4. **Characteristics of Nerve Net**: The nerve net in coelenterates is primarily composed of apolar neurons. These neurons do not have differentiated dendrites or axons, which means they are simpler in structure compared to the other types of neurons.

5. **Conclusion**: Therefore, the nerve cells of coelenterates are classified as apolar neurons.

**Final Answer**: The nerve cells of coelenterates are apolar.

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