Animals with free living larva but sedentary adult stage are

Molluscs

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Sponges

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Star Fishes

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Lobsters

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Solution

The correct option is B Sponges
A. Molluscs (phylum Mollusca) have a free living larval stage called Trochophore and the adult stage is also free living.
B. Sponges (phylum Porifera) have a free living larval stage called Amphiblastula and Parenchymula but the adult stage is sedentary as the sponges are attached to a substratum.
C. Star fishes (phylum Echinodermata) have a free living larva and adult stage.
D. Lobsters (phylum Arthropoda) have a free living larva which undergo metamorphosis into a free living adult.
So, the correct answer is 'Sponges'.

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