Ques. 1AIPMT 2008
Which one of the following is the true description about an animal concerned?
- Frog — Body divisible into three regions-head, neck and trunk
- Rat — Left kidney is slightly higher in position than the right one
- Earthworm — The alimentary canal consists of a sequence of pharynx, oesophagus, stomach, gizzard and intestine
- Cockroach — 10 pairs of spiracles (2 pairs on thorax and 8 pairs on abdomen)
Answer
(4) Cockroach — 10 pairs of spiracles (2 pairs on thorax and 8 pairs on abdomen)
Solution
⇒ Frog: as per NCERT, the body is divisible into head and trunk only; a neck and tail are absent — (1) is incorrect.
⇒ Rat: the right kidney lies slightly higher (more anterior) than the left one — (2) is incorrect.
⇒ Earthworm: the alimentary canal runs mouth → buccal cavity → pharynx → oesophagus → gizzard → stomach → intestine; the gizzard comes before the stomach — (3) is incorrect.
⇒ Cockroach: the respiratory system opens through 10 pairs of spiracles, 2 pairs on the thorax and 8 pairs on the abdomen — (4) is correct.
Answer: (4)