Phylum Arthropoda - Questions & Answers | Exam2Win

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306. Arms are not sharply delimited from central disc in

A. Ophiuroidea

B. Asteroidea

C. Crinoidea

D. Both A and B

Explanation:

307. Opening of water vascular system is called

A. Osculum

B. Ostium

C. Madreporite

D. Mouth

Explanation:

308. Coelomate animals devoid of excretory organs are

A. Annelids

B. Echinoderms

C. Molluscs

D. Arthropods

Explanation:

309. Echinodermata possesses

A. Pseudocoelom

B. Schizocoelom

C. Enterocoelom

D. None of the above

Explanation:

310. In echinoderms, the nervous system is

A. Well developed

B. With large brain

C. Devoid of brain

D. Both A and B

Explanation: