Biology, asked by pratik5476, 1 year ago

Phylum cnidaria classes (answer)

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Answered by Anonymous

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●A phylum of radially symmetrical invertebrates characterized by possession of stinging cells called nematocysts.

●It includes the classes→→

●ANTHOZOA
●CUBOZOA
●HYDROZOA
●SCYPHOZOA.

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Answered by Anonymous

On the basis of the dominance of polypoid phase in the life cycle, Phylum Cnidaria is divided into three classes.

$\sf{\underline{They\:are:}}$

$\implies$ Hydrozoa

$\implies$ Scyphozoa

$\implies$ Anthozoa

1) $\sf{\underline{Hydrozoa:}}$

$\implies$ In Hydrozoa, fresh water and marine forms are found.

$\implies$ They exhibit alteration of generations.

$\sf{\underline{\underline{Example:}}}$ Hydra, Obelia.

2) $\sf{\underline{Scyphozoa:}}$

$\implies$ Scyphozoa are marine.

$\implies$ They are umbrella shaped medusae.

$\implies$ Scyphozoa are also known as jelly fish.

$\sf{\underline{\underline{Example:}}}$ Aurelia.

3) $\sf{\underline{Anthozoa:}}$

$\implies$ Anthozoa are marine.

$\implies$ Anthozoa are represented by the polyp form.

$\sf{\underline{\underline{Example:}}}$ Pennatula, Adamsia.

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