In Hydra digestion comprises of (i) ingestion (ii) egestion (iii) excretion (iv) digestion.

(i), (ii) and (iv) are correct

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(ii), (iii), (iv) are correct

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(i), (ii), (iii) are correct

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All are correct

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Solution

The correct option is B (i), (ii) and (iv) are correct
In the case of Hydra, tentacles coil around the prey and ingest it.
Digestive enzymes are secreted in the cavity and the prey is digested by the enzymes released in the cavity. Hydra has the capacity to ingest prey almost twice its size.

After 2- 3 days the indigestible remains are thrown out of the body. Thus, the process of digestion involves ingestion, digestion, and egestion.

Therefore, the correct answer is option A.

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