Question

Which is not true for cockroaches?
A. 1 pair of compound eyes
B. Forewings called tegmina used for flight are attached to 1st thoracic segment
C. 1 pair of maxilla and mandible
D. Has 10 abdominal segments

Answer 1

Hint: They are the first pair of wings that are very thick and are present between the three pairs of the segments. It is like a hard covering or a stiff membrane present on the upper surface of the wings for their protection.

Complete answer:
The Cockroaches belong to the order Blattodea, they are insects that are also called roaches. They have a pair of forewings called tegmina which are found in the mesothoracic segment. It is tough and acts as a protective layer covering the hind wings, it is used for flight.

Additional Information: -The body of the cockroach is flattened, broad with a very small head. Its characteristic feature is its color from reddish-brown to dark brown.
-They have a pair of large compound eyes which do not provide sharp vision like human eyes, so they do not have a clear vision of objects, two ocelli, and a long, flexible antenna.
-The first pair of forewings are called tegmina that are present in the mesothoracic region.
-The forewings do not take part in the flight instead are the protective covering of the hind wings. -Cockroaches have a pair of the mandible and a pair of the mandible. They are the mouthparts which are present on the underside of the head.
-The body is divided into a thorax of three segments and a ten-segmented abdomen.
-The segments of the abdomen have 7th, 8th, and 9th sterna from a genital pouch in females. The 10th segment has a filamentous structure called the anal cerci, in both male and female cockroaches.

So, the correct answer is ‘Forewings called tegmina used for flight are attached to the 1st thoracic segment.

Note: The cockroaches are said to be an ancient group known to be present since the Carboniferous period which is around 320 million years ago. A recent phylogenetic analysis suggests that cockroaches originated at least in the Jurassic period.