Question

Write the two character of porifera and Co
elentert

Answer 1

Porifera
Asymmetrical- do not have proper symmetry.
Water canal system and presence of pores- for digestion,excretion etc.

Coelentrata
Radial symmetry- body can be divided into equal halves through any plane.
Alternation of generation- both secular and asexual phases.




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Answer 2

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Characteristic Features of Phylum Coelenterata

1) They are multicellular organisms, exhibiting tissue grade of the organisation.

2) They are diploblastic, with two layers of cells, an outer layer called the ectoderm and the inner layer called the endoderm.

3) They show radial symmetry.


Characteristic Features of Phylum Porifera

1) They are generally marine aquatic organisms, with a few freshwater species.

2) Their bodies are asymmetrical.

3) Body shape can be cylindrical, vase-like, rounded or sac-like.


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