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Porifera and Cnidaria

Question 27 R...

Question

Question 27
Real organs are absent in

(a) Mollusca
(b) Coelenterata
(c) Arthropoda
(d) Echinodermata

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Solution

Ans) (b) Coelenterata

Coelenterata has a cavity in the body and is made up of two layers of cells.Coelenterata has tissue level of organisation, that is they lack true organs. Mollusca, Arthropoda, and Echinodermata have organ level of organisation.

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Question 28
Hard calcium carbonate structures are used as skeleton by

(a) Echinodermata
(b) Protochordata
(c) Arthropoda
(d) Nematoda

Q. Question 6
Which among the following has open circulatory system?

(i) Arthropoda
(ii) Mollusca
(iii) Annelida
(iv) Coelenterata

(a) (i) and (ii)
(b) (iii) and (iv)
(c) (i) and (iii)
(d) (ii) and (iv)

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

Question 5
Which among the following is exclusively a marine animal?

(a) Porifera
(b) Echinodermata
(c) Mollusca
(d) Pisces

Question 7
In which group of animals, coelom is filled with blood?

(a) Arthropoda
(b) Annelida
(c) Nematoda
(d) Echinodermata

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Porifera and Cnidaria

Standard IX Biology

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