First slide

Classification of Animals

Question

Which of the following animal groups is correctly paired with its characteristic?

Moderate

A

Annelida - The body is covered by chitinous exoskeleton
B

Aschelminthes - Fertilisation is external and development is direct
C

Platyhelminthes - Flame cells help in excretion and osmoregulation
D

Cnidaria - Free-swimming polyp and sessile medusa stages

Solution

In Platyhelminthes, specialized cells called flame cells (protonephridia) help in osmoregulation and excretion. Chitinous exoskeleton is a characteristic feature of phylum Arthropoda (not Annelida). In Aschelminthes, fertilization is internal, and development is direct or indirect. In cnidarians, polyp is sessile and medusa is free-swimming.

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