First slide

Classification of Animals

Question

Choose the option that correctly matches the organism with its characteristics.

Moderate

A

Obelia - diploblastic with metagenesis during its life-cycle
B

Liver fluke - flame cells for digestion of food and suckers for locomotion
C

Ctenoplana - fresh water habitat and muscular foot for locomotion
D

Spongilla - commonly called bath sponge and its habitat is sea water

Solution

Obelia (Cnidaria) -Diploblastic. Obelia shows metagenesis during life cycle. It alternates between polyp and medusa stages.
Liver fluke (Platyhelminthes) - Flame cells are primarily osmoregulatory and secondarily excretory in function. It has a sucker but not hooks.
Ctenoplana (Ctenophora) - Marine and has no muscular foot (Muscular foot is observed in Mollusca).
Spongilla - Fresh water sponge (Euspongia is the bath sponge).

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