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Q.

If ‘1’ represents extracellular digestion, ‘2’ represents intracellular digestion and ‘3’ represents both types, then select the correct option for Cnidaria, Ctenophora and Porifera.

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a

1, 2 and 3 respectively

b

3, 3 and 2 respectively

c

3, 2 and 1 respectively  

d

3, 2 and 2 respectively

answer is B.

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Detailed Solution

Digestion is exclusively intracellular in Porifera. Digestion is both extracellular and intracellular in Cnidaria and Ctenophora.

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If ‘1’ represents extracellular digestion, ‘2’ represents intracellular digestion and ‘3’ represents both types, then select the correct option for Cnidaria, Ctenophora and Porifera.