Question

In cockroaches, wings are not present in ___________.
A. Prothorax
B. Mesothorax
C. Metathorax
D. None of these

Answer 1

Insects tend to carry a segment which is the anterior segment of the thorax and it does not contain wings. It is also the foremost segment of the three segments of an insect.

Complete answer:
In cockroaches, prothorax is the anterior segment of the thorax of an insect and this segment does not bear any wings. It is the foremost of the three segments in the thorax of an insect which bears the first pair of legs.
There are sclerites present on each side which are the pronotum, the prosternum, and the propleuron. Some fossil groups possessed wing-like projections but the prothorax never bears wings in extant insects.
If we look at options now, option A is Prothorax. This is the correct option since it is the anterior segment of the thorax of an insect and it does not bear any wings and that is what has been asked in the question. Therefore, this option is the correct one.
Moving to option B i.e., Mesothorax. It is the middle segment of the thorax of an insect which bears the forewings i.e., elytra but in the questions that segment is asked where there is absence of wings and that is prothorax. Therefore, this option is incorrect one due to which it gets eliminated.
Moving to option C i.e., Metathorax. It is the posterior segment of the thorax of an insect and it bears hindwings due to which this option is incorrect as in the question, that is asked where wings are absent but in this hindwing are present. Therefore, this option gets eliminated.
Last option D is none of the above. This option is incorrect as from the other options given, option A i.e., prothorax is the correct one which does not contain wings. Therefore, this cannot be the correct option.

Hence, the correct answer is option (A).

Note: From all the options given, prothorax is the anterior segment which does not contain wings due to which this option is correct. Mesothorax is the middle segment containing forewings and metathorax is the posterior segment containing hind wings.