Q.

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

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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

answer is A.

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Detailed 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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