Question

Which of the following characters are not found in cockroaches?
A. Compound eyes
B. Two pairs of wings
C. No jointed appendages
D. Three pairs of legs with jointed appendages

Answer 1

Hint: A cockroach can see, sense, fly, move etc. It can perform all the functions performed by an arthropod. Its body is divided into three regions, each having some special features to display.

Complete solution: Cockroaches are insects belonging to the phylum Arthropoda. The scientific name of cockroach is Periplaneta americana. They do not have very extraordinary features. They can tolerate a range of environments. Tropical cockroaches are bigger than temperate ones. The head, thorax and abdomen are the three regions of a cockroach.
They have many features which make them different from the other insects. Let us read about them as well.

Option A- compound eyes: Compound eyes are a feature of arthropods. They help the cockroach to have a wider view of the surroundings. They do not have a good vision but can detect a fast movement. They are capable of distinguishing colours.
Option B – Two pairs of wings: Cockroaches have two pairs of wings. Tegima are the fore wings arising from mesothorax which have the sole purpose of protecting the hind wings. Hind wings arise from metathorax and are used for flight.
Option C – No jointed appendages: This is untrue as cockroaches have three pairs of appendages.
Option D – Three pairs of jointed appendages: After the head region lies the three pairs of legs. Two appendages on the abdomen are called cerci. They can sense the danger from the predator.
> So clearly our answer is option C – no jointed appendages.

Note: There are some interesting facts about cockroaches. A newborn can run as fast as its parents. They can live up to 40 minutes without breathing. It can even live without its head for about 7 days. They can live without food for a month.