Question

If the head of cockroach is removed, it may live for few days because :

• A. the head holds a small proportion of a nervous system while the rest is situated along the ventral part of its body
• B. the head holds a 1/3rd of a nervous system while the rest is situated along the dorsal part of its body.
• C. the supra-oesophageal ganglia of the cockroach are situated in the ventral part of the abdomen
• D. the cockroach does not have a nervous system.

Answer 1

The correct option is A

the head holds a small proportion of a nervous system while the rest is situated along the ventral part of its body

The correct option is A:

Explanation of the correct option:

1. On the ventral side, the nervous system of the cockroach is made up of a series of fused, segmentally arranged ganglia connected by paired longitudinal connectives.
2. The thorax has three ganglia and the abdomen has six. Cockroaches have a neurological system that runs all over their bodies.
3. A small portion of the nervous system is located in the head, while the rest is located on the ventral (belly) side of the animal.
4. A cockroach's head can be chopped off and it will still live for up to a week.
5. The brain is represented in the head area by the supra-oesophageal ganglion, which sends nerves to the antennae and compound eyes.

Explanation of the incorrect option:

Option B:

A small portion of the nervous system is located in the head, while the rest is located on the ventral (belly) side of the animal.

Option C:

The brain is represented in the head area by the supra-oesophageal ganglion, which sends nerves to the antennae and compound eyes.

Option D:

On the ventral side, the nervous system of the cockroach is made up of a series of fused, segmentally arranged ganglia connected by paired longitudinal connectives.

Final answer: If the head of cockroach is removed, it may live for few days because the head holds a small proportion of a nervous system while the rest is situated along the ventral part of its body