The central nervous system of cockroach includes

Options

A. Brain and ganglionated dorsal nerve cord
B. Brain and ganglionated ventral nerve cord
C. Brain and hollow nerve cord
D. Dorsal solid nerve cord only

Explanation

**Step-by-Step Solution:**

1. **Understanding the Nervous System of Cockroach:**
- The central nervous system (CNS) of a cockroach consists of a brain and a nerve cord.

2. **Identifying the Components:**
- The brain of the cockroach is known as the supraesophageal ganglion, which is located in the head region.
- The nerve cord is a series of ganglia that are arranged segmentally along the body.

3. **Segmental Arrangement:**
- The cockroach's body is divided into three main segments: the head, thorax, and abdomen.
- The head contains one ganglion (the brain), the thorax has three ganglia, and the abdomen has six ganglia.

4. **Type of Nerve Cord:**
- The nerve cord in cockroaches is located ventrally (on the belly side) and is ganglionated, meaning it consists of multiple ganglia.

5. **Evaluating the Options:**
- Option A: Brain and ganglionated dorsal nerve cord - Incorrect, as the nerve cord is ventral.
- Option B: Brain and ganglionated ventral nerve cord - Correct, as this matches the structure of the cockroach's CNS.
- Option C: Brain and hollow nerve cord - Incorrect, as hollow nerve cords are characteristic of caudates (vertebrates).
- Option D: Dorsal solid nerve cord only - Incorrect, as the nerve cord is not dorsal in cockroaches.

6. **Conclusion:**
- The correct answer is **Option B: Brain and ganglionated ventral nerve cord**.

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