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Phylum Arthropoda - Questions and Answers

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271. In echinoderms and mollusks the skeleton is
A. Chitinous
B. Siliceous
C. Calcareous
D. Nacreous
Explanation:
272. Microscopic stalked pincer-like structures present in echinoderms are
A. Tube feet
B. Spines
C. Pedicellariae
D. Ossicles
Explanation:
273. Which of the following is fixed
A. Antedon
B. Asterias
C. Echinus
D. Cucumaria
Explanation:
274. Which is matched with two general characteristics?
A. Echinodermata – Pentamerous radial symmetry, internal fertilisation
B. Mollusca – Normally oviparous, trochophore or veliger larva
C. Arthropoda – Body divisible into head, thorax and abdomen, tracheal respiration
D. Chordata – Notochord, separate anal and urine apertures
Explanation:
275. Echinoderms are named so due to presence of
A. Arms
B. Spines
C. Pedicellariae
D. Tube feet
Explanation:
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