and Class Insecta. The class Insecta is divided into 2 subclasses: Apterygota,
or wingless insects, and Pterygota, or winged insects. Subclass Pterygota is
metamorphosis are the Exopterygota. Insects that undergo complete metamorphosis
are the Endopterygota.
Insects have an outer bilateral exoskeleton to which the muscles are attached
parts which are the head, which include mouthparts, eyes, and antennae; thorax,
which operate the jointed legs and /or wings; and abdomen, which has organs for
digested food, reproducing, and getting rid of waste products.
The major systems in insects are the circulatory, respiratory, nervous,
is pumped by the heart in a tube to the aorta, the head, and to other organs
few thousand samll but string muscles allowing the insect to carry objects
the mouth to the crop where it is stored, gizzard where it is grinded, stomach
where it is digested, then the undigested parts and wastes are moved to the
intestine, colon then released at the anus. And in the reproductive system, a
new individual is produced sexually when the female eggs produced in the ovaries
united with male sperm produced in the testes.
Both man and insect live almost everywhere, eat all kinds of food, and use all
insects seriously affect man’s health and are parasitic on man and other animals.
juices and spread the disease to other animals. Many insects irritate us without
and some insects are injurious to our agricultural crops, food products,
clothing, and wooden buildings. So far man has only partial success in defending
against insects. But some insects species are beneficial to man. The honey bee,
bugs really aren’t that bad.