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Phylum Cnidaria

The phenomeno...

Question

The phenomenon of polymorphism (presence of two distinct forms- polyp and medusa) is shown by the phylum

A

Porifera

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B

Cnidaria

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C

Nemotoda

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D

Mollusca

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E

Echinodermata

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Solution

The correct option is B Cnidaria
The presence of different type of individuals in a colony to perform specific functions is referred to as polymorphism. Cnidarians exhibit two distinct life forms namely polyp and medusa. A polyp is the sessile stage of the life cycle of certain cnidarians while medusa is their free swimming umbrella like a stage. Thus, the correct answer is B.

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Similar questions

Q. 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

Q. Consider the following statements during the alternation of generation or metagenesis in dimorphic cnidarians, the polyps are:
(1) Sedentary
(2) Free living
(3) Polyp forms the medusa sexually
(4) Polyp forms the medusa asexually
Which of the following given statements are correct?

Q. Which of the following statements regarding coelenterates are wrong?
I. Cnidocytes are present on the tentacles and on the body
II. They are diploblastic and have cellular level of organisation
III. Polyp forms are free-swimming
IV. They exhibit metagenesis
V. Polyps produce medusae sexually and medusae form polyps asexually

Q. Distinguish between polyp and medusa.

Q. Assertion [A]: Obelia exhibits metagenesis.
Reason [R]: Obelia exists in both polyp and medusa form.

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