Question 28
Hard calcium carbonate structures are used as skeleton by

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

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Solution

(a) Echinodermata

Hard calcium carbonate structures are used as a skeleton by Echinodermata.It is a characteristic feature of Echinodermata.

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

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

\begin{matrix} A & B & C Bilaterally symmetrical & Bilaterally symmetrical & Bilaterally symmetrical Pseudocoelomate & Open circulatory system & Marine animals Parasitic worms & Reduced coelomic cavity & Notochord \end{matrix}

Question 27
Real organs are absent in

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

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