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Alternation of Generations in Cnidarians

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Question

Find out the incorrect statement(s).

I. Polyp is sessile and cylindrical like Adamsia

II. Medusa is umbrella shaped and free-swimming like Aurelia

III. Polyps produce medusae sexually and medusae form the polyps asexually

IV. Medusae produce polyps sexually

A

I and IV

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B

Only I

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C

II and III

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D

Only III

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Solution

The correct option is D Only III

Polyps are sessile and reproduce asexually to form medusae by the process of budding.

Medusae are free swimming and reproduce sexually to form polyps.

Such alternation of asexual and sexual phases in life cycle of coelentrates is called metagenesis.

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(3) Polyp forms the medusa sexually
(4) Polyp forms the medusa asexually
Which of the following given statements are correct?

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Q. Distinguish between polyp and medusa.

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