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 27
Real organs are absent in

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

Question 28
Hard calcium carbonate structures are used as skeleton by

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

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

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

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