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Question

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

A
Presence of shell
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B
Presence of jointed legs
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C
Presence of water-driven tube system
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D
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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