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Presentation on the topic: Class 7 insects

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Head structure. The head contains 5-6 segments, usually practically merged with each other. They can be difficult to distinguish from each other, although sometimes they differ in color. The insect chest consists of three separate segments, with the exception of representatives of the suborder Stalk-bellied; in them, the first two segments can be distinguished, and the third merges with the first segment of the abdomen. The abdomen contains 10-11 segments, however, there may be less visible segments, since sometimes they are transformed into other structures or are lost again; the minimum number is 4. The visible segments are usually well distinguished from each other.

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The body of insects consists of three sections - head, chest and abdomen. On the head there is a pair of compound eyes and one pair of antennae, on the chest there are three pairs of legs and (in most of them) wings; there are no legs on the abdomen. Chitinous covers well protect the body of insects from water. Insects breathe with the help of trachea. The circulatory system is not closed; the nervous system consists of the periopharyngeal ring and the abdominal nerve chain.

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The black cockroach (body length up to 4 cm) lives in human dwellings. Here he settles in warm and dark places. Active at night: in the dark he goes in search of food. In many places, the black cockroach has been supplanted by the smaller ginger cockroach, or prusak. The flat body of the cockroach is covered with a hard chitinous cover - the outer skeleton. The surface layers of this cover consist of special proteins and wax-like substances that increase the mechanical strength and do not allow water to pass through.

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The cockroach body is divided into a head, chest and abdomen. On the chest (which has three segments) there are three pairs of legs (Fig.). Legs serve only for walking and running, therefore legs of this type are called running. Insect structure: A - external structure of the body of a black cockroach: 1 - antenna; 2 - leg; 3 - wing; B - limbs of various insects: 1 - cockroach; 2 - bears; 3 - praying mantis; 4 - grasshopper; 5 - swimming beetle

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The digestive system consists of the mouth opening, the oral cavity (the ducts of the salivary glands flow here), the pharynx, the esophagus, the goiter, the chewing stomach (where food is ground with chitinous teeth), the midgut (where food is digested and absorbed), the hind intestine and the anus. Between the stomach and the midgut there are special, blind outgrowths in which food is absorbed. Cockroaches are omnivorous and in human homes they eat a wide variety of food products, leftovers and waste of food, leather products, book bindings, houseplants.

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Internal structure Butterflies have a perfect nervous system and sense organs, due to which they are perfectly oriented in the environment, quickly react to danger signals. The nervous system, like all arthropods, consists of the periopharyngeal ring and the abdominal nerve cord. In the head, as a result of the fusion of clusters of nerve cells, the brain is formed. This system directs all movements of the butterfly, except for such involuntary functions as blood circulation, digestion, and respiration. Researchers believe these functions are controlled by the sympathetic nervous system. 1- excretory organs 2- middle intestine 3- goiter 4- heart 5- anterior intestine 6- large intestine 7- genitals 8- nerve node 9- brain

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The respiratory system is represented by tracheas - thin tubes. They begin with small holes - spiracles, located on the sides of the abdomen. Tracheas in the body of an insect branch strongly and deliver oxygen in the air directly to all internal organs and tissues. Carbon dioxide is removed through the trachea. Cockroaches periodically contract the abdomen and ventilate the trachea.

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The circulatory system is open. The body cavity, like in crustaceans and arachnids, is formed by the fusion of the primary and secondary cavities and is called mixed. Hemolymph flows not only through the vessels, but also in the body cavities, washing various organs and transferring nutrients to them, saturating at the same time waste products. Hemolymph does not participate in gas exchange - the transfer of oxygen and carbon dioxide, since this function is performed by the trachea. On the dorsal side of the cockroach is a heart that looks like a long, muscular tube with holes on the sides. Hemolymph enters the heart through these openings and flows through it from the posterior to the anterior end.

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The nervous system is represented by a large supraopharyngeal ganglion (it is often called the brain), a subopharyngeal ganglion, and an abdominal nerve cord. Nerves extend from the head ganglion to the eyes and other senses. The senses are well developed. The organs of vision of the cockroach are two large complex compound eyes and three simple eyes. The organs of touch and smell are located on the antennae. There are also thermosensitive organs that detect temperature changes. The organs of taste are located on the mouth organs.

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Reproduction. Cockroaches, like other insects, are dioecious. The reproductive system of females consists of the ovaries (where the formation of eggs occurs) and the oviducts. The male has two testicles, two vas deferens and an unpaired ejaculatory duct. Fertilization is internal. The eggs are packed in special capsules (bags). Females of black cockroaches lay capsules in various secluded places, and females of red cockroaches carry capsules at the end of their abdomen for up to 40 days - until the time when small cockroaches emerge from the eggs.The body of insects is divided into a head, chest and abdomen, they have a pair of antennae, three pairs of legs and one or two pairs of wings; the circulatory system is not closed. Insects are the most highly organized and numerous arthropods; they have the most advanced nervous system and sense organs.

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Insects, like other multicellular organisms, have many different receptors or sensilla that are sensitive to certain stimuli. Insect receptors are very diverse. Insects have mechanoreceptors (auditory receptors, proprioceptors), photoreceptors, thermoreceptors, chemoreceptors. With their help, insects capture the energy of radiation in the form of heat and light, mechanical vibrations, including a wide range of sounds, mechanical pressure, gravity, the concentration of water vapor and volatile substances in the air, and many other factors. Insects have a developed sense of smell and taste. Mechanoreceptors are trichoid sensilla that perceive tactile stimuli. Some sensilla can pick up the slightest vibrations in the air around the insect, while others signal the position of body parts relative to each other. Air receptors perceive the speed and direction of air currents in the vicinity of the insect and regulate the flight speed.

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25 interesting facts! As you know, the vast majority of spiders are hunters, and so the total weight of insects eaten by spiders per year is more than the mass of all people on the planet. There are about 35,000 species of spiders and 400,000 beetles in the world, and the largest of the beetles can reach a size of 17 cm (titanium beetle). The fastest insects on the planet are dragonflies, their speed can reach 57 km / h. these are grasshoppers and fleas. The jumping range of a grasshopper reaches 40 body lengths, and fleas 130. Houseflies usually live where they were born, but there are cases when flies can be carried away by the wind up to 45 kilometers. Attacus Altas is the largest butterfly in the world. Its wingspan reaches 30 cm. Because of this size, the butterfly is sometimes mistaken for a bird. Ordinary bees have 5 eyes, 3 of which are located at the top of the head, and 2 in front of it. The wing-flapping speed is over 11,000 times per minute. Now in the world there are about 20,000 species of bees. In the world there are about 9,000 species of ants (almost like birds) and by the way ants never sleep. Everyone knows swarms of locusts, and so the number of individuals in such a swarm can reach 50 billion and such The swarm can eat 4 times more food than all New Yorkers. A common cockroach can live up to 9 days without a head. The female cockroach has the ability to lay up to 2,000,000 eggs per year. All butterflies "taste" the taste of food with their hind legs. There is a type of wasp (emerald cockroach wasp) that control cockroaches by injecting their poison into them, after which they lead them holding by the antennae to their nest, where they later lay eggs in this cockroach

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MKOU "Secondary School No. 7" IMGCK Smertina V.N.

Provide general knowledge about the life of ants, honey bee and silkworm.
To instill in students a love of nature.

Class Insects

Large anthills, without exaggeration, can be called “fertility factories”. Pines grow faster next to anthills, herbage is higher and denser, plants demanding soil fertility, such as oaks, appear.

1. Covering of needles and twigs. Protects the home from the vicissitudes of the weather, is repaired and renewed by worker ants.

2. "Solarium" - a chamber heated by the rays of the sun. In the spring, the inhabitants come here to warm up.

3. One of the entrances. Guarded by soldiers. Serves as a ventilation duct.

4. "Cemetery". This is where the worker ants carry dead fellows and garbage.

5. Winter chamber. Insects congregate here to survive the half-hibernation cold.

6. "Bread barn". This is where the ants store the grains.

7. The Tsar's chamber, where the uterus lives, which lays up to one and a half thousand eggs a day. Working ants look after her.

8. Chambers with eggs, larvae and pupae.

9. "Cowshed" where the ants contain aphids.

10. "Meat pantry", where foragers bring caterpillars and other prey.

-hunters
babysitters
- builders
farmers
-guards
- "pastoralists"
- pickers fell
-seed collectors

Uterine females
Males

Bullet ant withstands deadly temperatures for other insects

The mixture of acids that pharaoh ants secrete is fatal to bed bugs. Therefore, in an apartment heavily infested with pharaoh ants, bedbugs almost always die out.

Scientists have calculated that red forest ants living in a large anthill, in one summer day, on average, bring into it up to 21 thousand different caterpillars and pupae of pests. But in general, such an anthill protects

about 1 ha

coniferous forest.

Reaper ants famous for their huge food reserves in anthills. For the winter, they can collect up to a kilogram of seeds and dead insects in the nest.

Bulldog ants- some of the most large ants in the world. The length of a working ant can reach 3 cm.

Leaf cutter ants are one of the few creatures in the world that are engaged in agriculture, and at a very high technological level. Working ants of these species gnaw pieces of leaves, carry them to an anthill, where these leaves are chewed by other ants, mixed with saliva and infected with spores of a special fungus.

Termites- a thunderstorm of wooden buildings and a real threat to human life. Mighty trees, infested by these insects, crumble before our eyes from one small push.

Everything bees Are great travelers. They unmistakably find their way back home, even after flying 8 kilometers away from it.

The weight of a normal bee swarm reaches 7-8 kg, and it contains 50-60 thousand bees. In goiter, this bee collective has 2-3 kg of honey. In case of inclement weather, bees will be able to feed on a supply of honey for

Silkworm got the name "mulberry", tk. its caterpillars eat mulberry leaves.

Silk thread is obtained from a silkworm cocoon - it is simply twisted, and the cocoon itself is used for cosmetic purposes (creams and lotions).
One insect cocoon yields up to 1000 meters of silk thread.

Sources of

http://www.wwalls.ru/large/201210/45995.jpg picture to create background and frame
http://img-fotki.yandex.ru/get/6206/90468072.428/0_7e094_d708fe31_XL.jpg plant
http://img1.liveinternet.ru/images/attach/c/3/83/444/83444169_large_0_540ae_8b91a803_L.png ladybug on a leaf
http://img0.liveinternet.ru/images/attach/c/3/83/444/83444166_large_0_540ab_1092d7c6_L.png ladybug
http://www.renders-graphiques.fr/image/upload/normal/gouttes-2.png water drops
The template is made in the program Adobe photoshop .

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Insects class

The insect class unites the most advanced arthropods. More than 1 million species of them are known.

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Structure

Head. The head contains 5-6 segments, usually practically merged with each other. They can be difficult to distinguish from each other, although sometimes they differ in color.
The insect chest consists of three separate segments, with the exception of representatives of the suborder Stalk-bellied; in them, the first two segments can be distinguished, and the third merges with the first segment of the abdomen.
Abdomen. The abdomen contains 10-11 segments, however, there may be less visible segments, since sometimes they are transformed into other structures or are lost again; the minimum number is 4. The visible segments are usually well distinguished from each other.

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The body of insects consists of three sections - head, chest and abdomen. On the head there is a pair of compound eyes and one pair of antennae, on the chest there are three pairs of legs and (in most of them) wings; there are no legs on the abdomen. Chitinous covers well protect the body of insects from water. Insects breathe with the help of trachea. The circulatory system is not closed; the nervous system consists of the periopharyngeal ring and the abdominal nerve chain.

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Lifestyle and exterior

The black cockroach (body length up to 4 cm) lives in human dwellings. Here he settles in warm and dark places. Active at night: in the dark he goes in search of food. In many places, the black cockroach has been supplanted by the smaller ginger cockroach, or the Prusak.
The flat body of the cockroach is covered with a hard chitinous cover - the outer skeleton. The surface layers of this cover consist of special proteins and wax-like substances that increase the mechanical strength and do not allow water to pass through.

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The cockroach body is divided into a head, chest and abdomen. On the chest (which has three segments) there are three pairs of legs (Fig.). The legs are used only for walking and for running, therefore legs of this type are called running.
The structure of insects: A - the external structure of the body of a black cockroach: 1 - antennae; 2 - leg; 3 - wing; B - limbs of various insects: 1 - cockroach; 2 - bears; 3 - praying mantis; 4 - grasshopper; 5 - swimming beetle

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Digestive system

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Internal structure of a black cockroach: 1 - esophagus; 2 - stomach; 3 - blind processes of the intestine; 4 - malpignan vessels; 5 - ovary; 6 - nerve nodes; 7 - salivary

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Internal structure

Butterflies have a perfect nervous system and sense organs, thanks to which they are perfectly oriented in their surroundings and quickly react to danger signals. The nervous system, like all arthropods, consists of the periopharyngeal ring and the abdominal nerve cord. In the head, as a result of the fusion of clusters of nerve cells, the brain is formed. This system directs all movements of the butterfly, except for such involuntary functions as blood circulation, digestion, and respiration. Researchers believe these functions are controlled by the sympathetic nervous system.

1- excretory organs 2- middle intestine 3- goiter 4- heart 5- anterior intestine 6- large intestine 7- genitals 8- nerve ganglion 9- brain

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Respiratory system

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Circulatory system

The circulatory system is not closed.
The body cavity, like in crustaceans and arachnids, is formed by the fusion of the primary and secondary cavities and is called mixed.
Hemolymph flows not only through the vessels, but also in the body cavities, washing various organs and transferring nutrients to them, while being saturated with waste products. Hemolymph does not participate in gas exchange - the transfer of oxygen and carbon dioxide, since this function is performed by the trachea. On the dorsal side of the cockroach is a heart that looks like a long, muscular tube with holes on the sides. Hemolymph enters the heart through these openings and flows through it from the posterior to the anterior end.

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Excretory system

The excretory system, like in arachnids, is represented by malpighian vessels - bundles of tubules blindly closed from the side of the body cavity, which open into the intestine. Metabolic products are filtered by the walls of the malpighian vessels from the body cavity.

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Nervous system

The nervous system is represented by a large supraopharyngeal ganglion (it is often called the brain), a subopharyngeal ganglion, and an abdominal nerve cord. Nerves extend from the head ganglion to the eyes and other sensory organs.
The senses are well developed. The organs of vision of the cockroach are two large complex compound eyes and three simple eyes. On the antennae are the organs of touch and smell. There are also thermosensitive organs that detect temperature changes. The organs of taste are located on the mouth organs.

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Reproduction

Reproduction. Cockroaches, like other insects, are dioecious. The reproductive system of females consists of the ovaries (where the formation of eggs occurs) and the oviducts. The male has two testicles, two vas deferens and an unpaired ejaculatory duct. Fertilization is internal. The eggs are packed in special capsules (bags). Female black cockroaches lay capsules in various secluded places, and female red cockroaches carry capsules at the end of their abdomen for up to 40 days - until the time when small cockroaches emerge from the eggs.
The body of insects is divided into a head, chest and abdomen, they have a pair of antennae, three pairs of legs and one or two pairs of wings; the circulatory system is not closed. Insects are the most highly organized and numerous arthropods; they have the most advanced nervous system and sense organs.

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Sense organs

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Vision

Vision plays an important role in the life of some insects, especially diurnal, flying and carnivorous ones, however, they are also short-sighted - their area of point of view does not exceed a few centimeters.
They cannot focus their eyes in order to accurately determine the shape of objects, but they perfectly track movement and distinguish colors, and colors are different from us: they see ultraviolet - its different shades, a whole rainbow inaccessible to us in the invisible spectrum

Presentation for the lesson on the topic "Variety of insects"

Prepared by a biology teacher
Rusina E.V.
MAOU gymnasium number 111
Ufa, Kalininsky district, RB

Lesson topic "Variety of insects"

The motto of the lesson is "Observe, do not be afraid, be surprised, admire!"
"About many six-legged ones,
Beautiful and poor
We are for each of you
We will tell you without embellishment "

R a z m and n and

Spiders are wingless insects. (No)
Insects live not only on land but also in water. (Yes)
The largest insects are the inhabitants of the tropics. (Yes)
The legs of insects are on the chest and abdomen. (No)
Insects eat everything, and some of them eat feathers, wool, wood and plastic. (Yes)
Gill respiration is developed in adult insects living in water. (No)
Insect blood only flows through the blood vessels. (No)
The most numerous order of insects is beetles. (Yes)
Most insects are pests. (No)
The main respiratory organs of insects are the trachea. (Yes)
The blood fluid of insects (hemolymph) is red. (No)
Adult insects breathe atmospheric air. (Yes)
The cabbage butterfly feeds on the nectar of flowers. (Yes)
Mosquitoes have gnawing mouth organs. (No)
Most insects have a tubular heart. (Yes)
The excretory organs of insects are the kidneys. (No)
In all insects, the male and female cannot be distinguished. (No)
The antennae of insects are the organs of smell. (Yes)

Biological dictation "Definitions - concepts". Answers:

2, 8, 3, 5, 4, 10, 9, 7

Competition "Get to know me!"

I love plants of the cruciferous family, from their smell I just lose my head.
For this, the person dislikes me.
Everything strives to destroy the clutches of my eggs and my larvae - caterpillars

Competition "Get to know me!"

I am handsome! And even medicinal. In the old days, they made an excellent diuretic from me and my brothers.
In those good old days, you could often see me in the circus: you bet, because I am the smartest and I am perfectly amenable to training.
Even if you do not invite me to dinner, I will not be slow to show up, I only need a few bread crumbs or poorly washed plates, at worst I can do with paper.

Competition "Get to know me!"

We are omnivores, we love ripe berries and fruits, animals, who are smaller, in extreme cases, just greens.
We hold the records for long jump and high jump.
We are musicians, we are called "violinists"

Goliath beetle

Zlatki

Hercules beetle

Brazilian stick insect

"The best of the best!"

Termites

"The best of the best!"

Agrippina butterfly

Dragonfly

Silkworm

Lice

"The best of the best!"

Flea

Bees

Hawk moth

"Confusion"

1. Orthoptera - May beetle
2. Homoptera - fly
3. Coleoptera - locusts
4. Lepidoptera - aphids
5. Diptera - bee
6. Hymenoptera - butterfly urticaria

"The debauchery"

1. Orthoptera - locusts
2. Homoptera - aphids
3. Coleoptera - May beetle
4. Lepidoptera - women. hives
5. Diptera - fly
6. Hymenoptera - bee

" Passport "

Kingdom: animals
Type: arthropods
Class: insects
Order: Diptera
Genus: fly
Type: housefly

" Passport "

Kingdom: animals
Type: arthropods
Class: insects
Order: Hymenoptera
Genus: bee
Species: honey bee

" Passport "

Kingdom: animals
Type: arthropods
Class: insects
Order: Coleoptera
Genus: beetle
Species: swimming beetle

"Everything amazes us in the nature of small creatures - a flying bumblebee, a chirping cricket A spider weaving a web, And a worm that turns into a fluttering flower." Fo-Gel-Jo

Thank you for the attention!

RIDDLES Suddenly a black cloud appears, The wind does not blow, but the cloud is flying; The rain from her will not multiply the harvest, The downpour alive will destroy everything around. Red, but not a horse, Horn, but not a ram, They don't like houses, And they won't buy at the bazaar. The nose is long, the voice is thin, Flies - squeaks, sits down - is silent. Whoever kills him will shed his blood. In the forest, the kettle is boiling, boiling, But there is no ukip. Not a bird, but with wings. Not a bird, but flies, With a trunk, not an elephant, Nobody tames, And sits on us.

DEVELOPMENT OF INSECTS A) DEVELOPMENT OF INSECTS WITH COMPLETELY TRANSFORMATION (BUTTERFLIES, BEETLES, COMMARS, FLIES, BUMPES, WASP, BEES, ANTS) EGG PUPPET PUPPET PUPPET PUPPET PUPPETS, SWEET PUPPETS, SWEET PUPPETS, SWEET PUMPS, SWEETS , CICADES, CLAWS) EGG LARVE ADULT

SCARAB BEETLE One of the dung beetles - the sacred scarab - attracted the attention of the ancient Egyptians by sculpting balls of dung. The Egyptians saw in the rolling of the ball a symbol of the movement of the sun across the sky, and in the teeth on the beetle's head - a semblance of sun rays. This turned out to be enough for the beetle to be deified, honors were given to it. Try to explain the behavior of the beetle based on your knowledge.

LADYBIRD POISON When shaking trees and bushes, ladybugs often fall from them. Having fallen, they lie belly up for some time. If you touch them with tweezers, then on their legs you can notice the appearance of droplets of a bright yellow liquid with poisonous properties. A minute later, another ladybug turns upside down, begins to crawl slowly and then flies away. What does this ladybug behavior mean?

COLORADIAN BEETLE The native land of the Colorado potato beetle is North America. In natural conditions, he lived on the slopes of the mountains and ate wild nightshade plants. The beetle was accidentally brought to Europe during the First World War and became a terrible pest of potatoes here. What was the reason for this?

The largest (up to 40 mm) and most poisonous representative of public wasps, the hornet (Vespa crabro L.), deserves special attention. The head of this species is yellow or yellow-red, the chest is black, the abdomen in the back half is yellow, with black spots. Hornets nest in hollows, wooden buildings, sometimes in hives. In deciduous forests, they inhabit up to 5% of hollow nests. The nest is first built by the overwintered female. Soon, sterile female workers emerge from the larvae fed by her, who take upon themselves all the further worries about the family. By autumn, young females and males appear in the nest, and the founder of the nest - the uterus - and her working daughters perish, the family disintegrates, males and females scatter. Males die after fertilization of females, young females climb into secluded places for the winter and fall asleep. In the spring, each of them begins to create their own family. Many insects become prey for hornets, which they are able to kill with a sting blow or simply with their jaws. The prey is immediately gnawed, for example, the head and abdomen of the bees are gnawed off, and the chest is thoroughly chewed, and the wasp feeds the larvae with this "gruel". The hornet itself prefers nectar and other sweet foods. This species can cause serious damage to beekeeping. HORNET

Ants are essential for humans as raw materials for obtaining chemicals, as well as medicines. New substances, previously unknown to science, such as iridomyrmecin, isoiridomyrmecin, iridodial, and dendrolysin, have now been obtained from ant venoms in crystalline form and studied. Iridomyrmecin and dendrolysin can be used as insecticides. Formic alcohol, obtained from red forest ants, has long been used to lubricate sore joints with rheumatism. In the old days, formic acid was extracted from ants, now it is obtained chemically. Black carpenter ants (genus Camponotus) are dried and ointments are made from the powder. The Nanai use this fish oil ointment to lubricate aching areas of the body. In Germany, woodcutters ate carpenter ants as a remedy for scurvy, and the Prussian Pharmacopoeia recommended a tincture of ants for treating neuralgia. An alcoholic tincture of the larvae of yellow ground ants (Lasius flavus F.) has a stimulating effect. It has been established that the venom of red ants contains an antibiotic that effectively kills fungi and bacteria, including the pathogenic streptococci and staphylococci - the causative agents of typhoid, cholera, tuberculosis. ANT TINCTURE

Most people are wary of wasps. From our own experience or at the instigation of our elders, we remember them from childhood (this is helped by a contrasting black-and-yellow drawing) and we are afraid of our entire conscious life. There are stories among the people about the unfortunate, stung to death by wasps. Unfortunately, these stories are based on real ground. It is well known that in the summer, especially in the south, wasps come to feast on sweet fruits and compote. The sting of these insects is very painful and immediately causes swelling. With an injection in the neck, and even more so if a person, through negligence, swallowed a wasp caught in a compote, jam or inside a ripe fruit, it is necessary to take the most urgent measures. Delay will result in death from suffocation due to the spread of edema to the respiratory tract. There are known cases of death of people who drank water from the "spout" of the teapot, in which the wasp was sitting. Fatalities have been recorded during a mass attack by wasps. In all likelihood, the wasp toxin acts selectively on the kidneys. For people who are hypersensitive to wasp poison, injections from these insects can also pose a serious danger. THESE SCARY WASP

This butterfly needs no introduction. Many have seen its caterpillars, which are among the most voracious pests of cabbage. Caterpillars of cabbage grow up to 4 cm long, grayish-green with black spots and dots, grouped in more or less regular transverse rows. On the sides of the body, these creatures have yellow stripes, the abdominal surface is yellow, and the entire body is covered with thick, very short hairs, giving it a velvety appearance. The variegated coloring of the caterpillars is a sign of inedibility. In cabbage butterflies caterpillars, the poisonous gland is located on the lower surface of the body, between the head and the first segment. Defending themselves, they regurgitate a green gruel from their mouths, to which they also mix the secretions of the poisonous gland. This discharge is a pungent, bright green liquid, with which the caterpillars try to smear the attacking enemy. For small birds, a dose of a few of these animals can be lethal. Swallowed cabbage caterpillars are the cause of death of domestic ducks. People who collected these creatures with their bare hands happened to end up in the hospital. The skin on the hands was reddened, inflamed, the hands were swollen and itchy. "SIMPLE" CABBAGE WHITE ANSWERS: Puzzle "Signs of insects": insects have three pairs of legs and most have two or one pair of wings. Puzzle "The role of insects in nature": insects are the most important link in the food chains of natural communities. Riddles: locust, butterfly, fly, anthill, cockroach, mosquito. Cognitive tasks: 1. If you destroy all insect pests, then the food balance will change, food connections will be disrupted, which in turn will lead to a significant change in the animal world. So, in places where mosquitoes were temporarily destroyed, the number of birds and fish decreased. Mosquitoes are the main food for many species of birds, and their larvae are food for fish. 2. Butterflies themselves do not bring harm, their numerous gluttonous caterpillars are pests. 3. It is best to shake off the beetles early in the morning, while it is cool and humid: at this time, the insects are not very mobile. 4. The right student who argued that the larvae of flies feed on the products of rotting meat, since their mouth apparatus sucks. 5. Insect predators and insects parasitizing on caterpillars are bred in laboratories in order to release them on farmlands to destroy harmful insects. This method is called biological pest control. 6. The majority of insects, even harmful to the national economy, cannot be completely destroyed, because this will entail a violation of the necessary food connections between organisms in nature. An exception can be made for "domesticated" harmful insects such as lice, cockroaches, and moths.