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Question

Choose the features that represent phylum Arthropoda:
I. Metameric segmentation
II. Parapodia
III. Jointed appendages
IV. Bilateral symmetry
V. Triploblastic

A
I and II only
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B
III, IV and V only
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C
II and III only
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D
IV and V only
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Solution

The correct option is B III, IV and V only
Organisms such as crabs, insects, spiders have jointed appendages and are a part of phylum Arthropoda. They are bilaterally symmetrical as their bodies can be divided in two equal halves through a single plane. They have three germ layers i.e. ectoderm, mesoderm, endoderm and, hence, are called triploblastic. They also have a true coelom as the body cavity is lined by the mesoderm.

Metameric segmentation is a characteristic feature of all annelids and parapodia is a feature of aquatic annelids (Nereis).

Organisms in phylum Platyhelminthes, Aschelminthes and Annelida are bilaterally symmetrical and triploblastic.

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