Phylum porifera and Coelentrata — lesson. Science CBSE, Class 9.

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எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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Porifera:

The name Porifera means organisms with pores. This species includes animals that are non-motile and attached to reliable support. They are commonly called as sponges and are mostly marine. These organisms contain pores all over their body which lead to a canal system. This canal is involved with circulating water throughout the body so that the food and oxygen are transported to the various parts. They are externally covered by a rigid skeleton made of spongin protein and calcium carbonate.

The body of these organisms has a minimal differentiation as follows:

They show cellular-level of organisation
They lack tissues and organs.
Their body does not show any segmentation.
They are acoelomates.

Clockwise from top left: Leucosolenia (smallest sponge), Euplectella (Venus flower basket), Spongilla (freshwater sponge) and Sycon

Coelentrata:

They are also known as cnidarians. These are aquatic animals that show more body design differentiation. They are often found as colonies, but like a hydra, some are solitary.

The body of cnidarians:

Their body is made up of two layers of cells: An inner lining of the body and outside the body. Hence they are known as diploblastic animals
They show the tissue level of organisation
Their body lacks segmentation
They lack organs
They are acoelomates

Clockwise from top left: Aurelia (Jellyfish), Sea anemone, Adamsia, Corals and Hydra

Reference:

https://upload.wikimedia.org/wikipedia/commons/8/82/Sycon_sp.png
https://upload.wikimedia.org/wikipedia/commons/thumb/6/6b/Sponges_at_SAS_Transvaal_DSC09129.JPG/512px-Sponges_at_SAS_Transvaal_DSC09129.JPG
https://www.flickr.com/photos/noaaphotolib/9734258717
https://upload.wikimedia.org/wikipedia/commons/0/0b/Spongillidae_middle.jpg
https://upload.wikimedia.org/wikipedia/commons/thumb/7/71/Pagurus_prideaux.jpg/512px-Pagurus_prideaux.jpg
https://www.flickr.com/photos/usfwspacific/5565696408
https://upload.wikimedia.org/wikipedia/commons/thumb/0/0a/Mikrofoto.de-Hydra_15.jpg/512px-Mikrofoto.de-Hydra_15.jpg
https://upload.wikimedia.org/wikipedia/commons/thumb/5/5c/Aurelia_aurita_2.jpg/512px-Aurelia_aurita_2.jpg

https://www.flickr.com/photos/volvob12b/14231557292

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2. Phylum porifera and Coelentrata

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