GENERAL HISTOLOGY

Detailed explanation-1: -A sea star has 2 stomachs, the cardiac stomach and the pyloric stomach. It can push the cardiac stomach out of its mouth, in the centre of its underside, to engulf prey or insert it into prey (between 2 shells, for example). The stomach then secretes a powerful digestive enzyme to break down the prey.

Detailed explanation-2: -water vascular system is a modified part of coelom & consists of a system of sea water filled canals having certain corpuscles. It plays most vital role in the locomotion of the animals & comprises madreporite stone canal, ring canal, radial canal, Tiedman’s body, lateral canals & tube feet.

Detailed explanation-3: -Osphradium is an olfactory organ that is found in certain molluscs. The correct answer is option D. i.e., Osphradium.

Detailed explanation-4: -They have two stomachs…and the way they eat might make your skin crawl. The anatomy of a sea star’s digestive system is quite alarming, and has an incredibly unique two-part stomach system.