Nerve cord of Cockroach is

Options

A. Dorsal and single
B. Dorsal and double
C. Ventral and single
D. Ventral and double

Answer

To answer the question "Nerve cord of Cockroach is," we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Organism**: The question refers to the nerve cord of a cockroach, which is an insect belonging to the phylum Arthropoda.

2. **Understand the Structure of the Nerve Cord**: In insects, including cockroaches, the nerve cord is not located in the dorsal position as seen in vertebrates. Instead, it is located on the ventral side of the body.

3. **Specify the Location**: The ventral nerve cord of the cockroach is situated specifically on the ventral side of the alimentary canal.

4. **Composition of the Nerve Cord**: The nerve cord in cockroaches is made up of two longitudinal nerves. This means that it has a double structure.

5. **Nature of the Nerve Cord**: The longitudinal nerves in the cockroach's nerve cord are solid, which differentiates it from other types of nerve cords that may be hollow.

6. **Summarize the Characteristics**: Therefore, the characteristics of the nerve cord in a cockroach can be summarized as:
- It is **ventral** (located on the belly side).
- It is **double** (composed of two longitudinal nerves).
- It is **solid** (the nerves are not hollow).

7. **Choose the Correct Option**: Based on the above characteristics, the correct description of the nerve cord of a cockroach is "ventral and double."

### Final Answer:
The nerve cord of the cockroach is **ventral and double**.

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