First slide

Classification of Animals

Question

Which of the following represents the correct combination of a group with its character, without any exception?

Moderate

A

Echinodermata – External fertilisation
B

Arthropoda – Chitinous exoskeleton
C

Platyhelminthes – Hooks and suckers
D

Mollusca – Open circulatory system

Solution

All Arthropods have chitinous exoskeleton.
Internal fertilisation occurs in few Echinoderms.
Among Platyhelminths, hooks and suckers are absent in free-living forms like planarians.
Among Molluscans, open circulatory system is absent in Cephalopods (e.g. Sepia).

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