Question

write brief explanation phylum - ctenophora ?

Answer 1

ANSWERS :-


✨ PHYLUM - CTENOPHORA ✨


⚡IT is coined by eschbolty (1829)

✴ General character ✴

✨ Diploblastic

✨Biradial symmetry

✨Acelomate

✨ Tissue grade of organisations

✨Free swimming form

✨ presence of 8 external raw of cilia.

✨member are commonly called sea walnut /comb jelly.

✨ Absence of nematoblast cells on the outer ectodermal layers but presence of calloblast /lassocells.

✨ circulatory , respiratory , excretory and skeletal system are absent .

✨ Diffused type nervous system presence of nerve net.
✨sense organ is present in the form of statocyt on the aboral end.

✨ Asexual reproduction is absent.

✨ monoecious the testes and ovary developed on the endodermal layer of digestive canal.

✨ Internal fertilization and larva formed is called cydippids larva

⚡It is divided into two classes on the basis of tentacles :-

✴class (1) Tentaculate

✴class(2) Nuda

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❤BE BRAINLY ❤
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Answer 2

Answer :

Phylum - Ctenophora :

• Organisns in this phylum are commonly called the sea walnuts or comb jellies.
• They are radially symmetrical.
• They are marine organism.
• They are diploblastic.
• They are acelomate.
• These organisms have tissue level of body organisation.
• Their body has eight external rows of combo plates which have cilia.
• These comb plates help in locomotion.
• The digestion in these organisms are are extracellular and intracellular both.
• They are bioluminescence, that they have a property of emitting light.
• They are hermaphrodite.
• They reproduce sexually.
• The fertilization takes place externally.
• The development of an organism after fertilization is indirect.
• The examples of such organisms include Ctenoplana and Pleurobrachia.