Question

Which one of the following is the true description about an animal concerned?

• A. Earthworm - The alimentary canal consists of a sequence of pharynx, oesophagus, stomach, gizzard and intestine
• B. Cockroach - 10 pairs of spiracles (2 pairs on thorax and 8 pairs on abdomen)
• C. Rat - Left kidney slightly higher in position than the right one
• D. Frog - Body divisible into three regions - head, neck and trunk

Answer 1

The correct option is B

Cockroach - 10 pairs of spiracles (2 pairs on thorax and 8 pairs on abdomen)

In cockroach, two pairs of spiracles are present in the thoracic region and eight pairs are present in the abdominal region. Spiracles are slit-like apertures through which air enters the body of a cockroach.

In rat, the right kidney is slightly higher in position than the left kidney due to the position of the liver.

In earthworm, the correct sequence of the alimentary canal is pharynx, oesophagus, gizzard, stomach and intestine.

In frog, the body is divisible into the head and trunk. The neck is absent.