First slide

Classification of Animals

Question

Which of the following features are common to Mollusca and Echinodermata?
(a) Mantle over the visceral hump
(b) Organ system level of organisation
(c) Water vascular system
(d) Unsegmented body
(e) Absence of excretory system

Moderate

A

(a), (c), (d) and (e)
B

(b), (c), (d) and (e)
C

(c), (d) and (e) only
D

(b) and (d) only

Solution

Both molluscs and echinoderms are unsegmented animals and exhibit organ system level of organisation. The mantle is unique to molluscs. The presence of water vascular system and absence of excretory system are the features of Echinodermata.

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