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Phylum Mollusca

The presence ...

Question

The presence of cnidoblast is the characteristic feature of the phylum:

A

Porifera

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B

Ctenophora

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C

Annelida

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D

Coelenterata

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Solution

The correct option is D Coelenterata
A cnidoblast is a stinging cell which shoots out a nematocyst or stinging organ when stimulated. Cnidoblasts define the phylum cnidaria or coelenterata. Aurelia (jellyfish), sea anemone and hydra belong to this phylum.

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Q. The presence of cnidoblast is the characteristic feature of the phylum:

Q. Match the columns and find the correct option

(a)	Choanocytes	(i)	Arthropoda
(b)	Cnidoblasts	(ii)	Ctenophora
(c)	Green gland	(iii)	Porifera
(d)	Nephridia	(iv)	Coelenterata
(e)	Comb plates	(v)	Annelida

Q. Which of the following phylum exhibit tissue level organization ?
(a) Porifera
(b) Mollusca
(c) Coelenterata
(d) Ctenophora
(e) Platyhelminthes

Q. Match the following:

Column I	Column II
A. Choanocytes	I. Platyhelminthes
B. Cnidoblasts	II. Ctenophora
C. Flame cells	III. Porifera
D. Comb plates	IV. Coelenterata

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