Question

Explain the polyps and medusae stages in cnidaria

Answer 1

Answer:

Explanation:   In species with both forms, the medusa is the sexual, gamete-producing stage and the polyp is the asexual stage. Cnidarian species include individual or colonial polypoid forms, floating colonies, or large individual medusa forms (sea jellies).  Medusa is a mobile life cycle stage of the Cnidaria phylum, contracting with it muscular bell. Polyp have a tubular shape and are fixed at their base, with the mouth present at the other end of the tube facing the water. Medusa have a bell shape, with tentacles hanging down. Polyp do not have a manubrium. Difference Between Medusa and Polyp

Polyp

Medusa

Mobility

Polyps are sessile

Medusae are mobile

Shape

Polyps possess a tubular shape

Medusa has a bell-shaped body

Mouth

The mouth of polyps faces the water upwards

Medusa have their mouths facing the water downwards

Manubrium

Absent in polyps

Present in medusae

Sense Organs

Absent in polyps

Photoreceptors and statocyst are present in medusae

Method of Reproduction

Can reproduce sexually as well as asexually

Exclusively sexual reproduction

Reproduction

Polyps can give rise to more polyps as well as medusae through budding

Medusae can only give rise to medusae

Evolution

Polyps are a relatively primitive form of cnidarians

Medusae are much more evolved and complex form of cnidarians                              

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Answer 2

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All cnidarians have two membrane layers, with a jelly-like mesoglea between them. Some cnidarians are dimorphic, that is, they exhibit both body plans during their life cycle. In these species, the polyp serves as the asexual phase, while the medusa serves as the sexual stage and produces gametes.

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