Assertion: Oesophagus pierces the diaphragm and enters the abdominal cavity.
Reason: Peristaltic movement starts from oesophagus.

What happens, if there is no peristaltic movement in Oesophagus?

Provide the reasons for the presence of scrotum outside the abdominal cavity.

Assertion : The testes are situated outside the abdominal cavity within scrotum . Reason : Lower temperature for the testis is necessary for spermatogenesis.

Assertion : The testes are situated outside the abdominal cavity within scrotum . Reason : Lower temperature for the testis is necessary for spermatogenesis. (a) If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion . (b) If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. (c) If Assertion is True but the Reason is False . (d) If both Assertion & Reason are False.

Assertion Scrotum is a pouch in which testes are held. Reason A pocketed sac of the abdominal cavity or pelvic cavity holds testes.

Assertion : Plant movements induced by external stimuli are known as autonomic movements. Reason: Seismonastic movements are shown by crows.

Name the muscular portion that separates thoracic cavity from abdominal cavity.

Assertion : Iris of eye is called diaphragm of the eye. Reason : Iris closes the eye to protect from injury, entry of insects, etc.