Question

Diagnostic feature of insects is
(a) three pairs of legs (b) compound eye
(c) chitinous body (d) two pairs of wings

Answer 1

The right answer is

(d) Two pairs of wings

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Answer 2

Answer is option "a"

Explanation:

• Members of the class, Insecta have two pairs of wings, three pairs of jointed legs, tri-segmented bodies, head, thorax, and abdomen, hard exoskeletons, a pair of compound eyes, a pair of antennae and bilateral symmetry. But the diagnostic feature of insects is three pair of legs, because, the other features, which are mentioned on top are also can be seen in other organisms. But, only insects have 3 pairs of legs.  
• Insecta is the group which includes all the organisms commonly called as insects. The characteristics of group Insecta are that they have six legs or three pair of legs. These legs contain the jointed segments. They have their body covered with the exoskeleton.
• So, the right answer is option a "three pairs of legs".