world of insects known to man for a long time.More on cave paintings (twenty thousand years ago) were found images of bees and silkworm breeding worm in China engaged in five thousand years ago.In Ancient Egypt, the sacred symbol of which was a scarab beetle, preserved signs of an invasion of locusts.
class insects is one of the most numerous.If you look closely at the body of an insect, it is possible to observe a clear division: the head, chest, abdomen.A pair of antennae, which are the senses, a pair of eyes and mouthparts are located on the head.Each of the three segments of the thoracic endowed with a pair of legs.The dorsal side of the two segments is provided with one and sometimes two pairs of wings.Abdomen any specimens representing the class of insects, is also divided into segments, which can be from six to twelve.
hypodermis, which is located just below the chitin covering the body from the outside, is made homogeneous cells, some of them are glandular.Chitin having a feature is not stretched, replaces the old layer to the next, that is, the process of molting.This process is very important for the growth of insect.
a sophisticated class of insects mouthparts consisting of upper and lower jaw, upper and lower lips and tongue, which is chitinous protrusion floor of the mouth.
Mouth apparatus is of several types of insects: beetles gnawing it, flies - licking, butterflies - sucking, and mosquitoes and fleas - piercing-sucking.
respiratory organs are the trachea, they supply the tissues with oxygen.Up to ten pairs of breathing holes are located on the sides of the insect's body.
Weak development of the circulatory system is due to the special structure of the respiratory system.The nervous system is also, by contrast, has a high level of development.There are three departments "brain" - front, middle and rear.
creatures representing the class of insects have well-developed senses.Sensitive hairs, available all over the body, the function of the organs of touch, and antennae and mandibular palps are olfactory organs.With regard to the hearing, that certain types of insects, grasshopper, for example, capture the sounds of the third pair of legs.It was here, on the legs, and hearing organs are located.Eyes insects this class may be simple or complex.When there is friction teeth of the upper wings of the thigh of the hind limbs, appears characteristic of an insect sound.
Typically, insects bring a person a lot of problems.These vectors and pathogens of various diseases.Because scientists have long been engaged in the study of this class.The science that studies insects is called entomology.Today, it is highlighted in a separate branch of biology and developing this industry extremely rapidly.
entomologists can be divided into several distinct areas: general entomology, health, forestry, veterinary, agricultural.Separate story Beekeeping and silk culture - they are very closely related to entomology.
general each direction this science has its own specifics.For example, general entomology has been studying the basic structural features of insects, both internal and external, the study of their way of life, growth and reproduction, as well as identifying their relationship with the environment.
insect pests and pollinating insects come to the attention of agricultural entomology.Scientists are developing in this direction as methods of pest control in order to minimize the damage done to agriculture.
Insects class is huge and diverse.Its representatives live everywhere: the soil and the plants, air and water, as well as the mountains and the lowlands, deserts and snow - all their usual habitat.
