A student identified a triploblastic, segmented coelomate as an arthropod. Which additional character he should have considered to be sure?

Presence of shell

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Presence of jointed legs

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Presence of water-driven tube system

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Type of coelom

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Solution

The correct option is D Presence of jointed legs
Arthropods are bilaterally symmetrical, triploblastic, segmented coelomates. They can be characterized by the presence of jointed legs, chitinous exoskeleton and blood-filled coelom.
Molluscs have a tough calcareous shell to protect their soft body whereas, echinoderms have a water-driven tube system.
So, the correct answer is option B.

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Body segmented and jointed legs, with compound eyes.

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Question 9
Which one is the most striking or (common) character of the vertebrates?

(a) Presence of a notochord
(b) Presence of triploblastic condition
(c) Presence of gill pouches
(d) Presence of coelom

Question 18
Which one of the following feature is not a characteristic of protochordata?

(a) Presence of notochord
(b) Bilateral symmetry and coelom
(c) Jointed legs
(d) Presence of circulatory system

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