Consider the alternatives given below and choose the correct answer from the code given below.
Hydractinia is I marine II freshwater III colonial IV solitary. Out of this,

I and III are correct

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II and III are correct

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II and IV are correct

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I and II are correct

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Solution

The correct option is A I and III are correct
Hydractinia echinata is a marine organism. The organism is known as hydroid and forms colonies. The organism forms the polyps. This is the organism which is found on the shells of the gastropods. These are commonly found on the shells of the snails.
Therefore, the correct answer is option A.

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Consider the alternatives given below and choose the correct answer from the code given below.Hydractinia is I marine II freshwater III colonial IV solitary. Out of this,

Consider the alternatives given below and choose the correct answer from the code given below.
Hydractinia is I marine II freshwater III colonial IV solitary. Out of this,