Solve a biological problem.

I. Testing knowledge.

Task number 1. Find an extra insect. Why exactly does it not fit into this company. Justify your answer.

A. Krasotel odorous, ladybug, Colorado beetle, head louse

B. Gladysh, bed bug, water strider, dragonfly large rocker.

Task number 2. Name the insects

  1. Beetles that damage grains of cereals: rye, barley, wheat (bread beetles, or grasshoppers)
  2. Beetles that in adult and larval state destroy aphids, whiteflies, spider mites (ladybugs)
  3. Beetles that destroy the gypsy moth pest of the forest (beetles – beetles)
  4. Diurnal predatory insect, with gnawing mouthparts, large eyes on the head, the larvae of which develop in water (dragonfly)
  5. Wingless parasites of mammals with a flattened body, small head, piercing-sucking mouthparts; continuously multiply by laying eggs (nits) (lice)
  6. Bugs that live on the surface of the water (water striders)

Task 3 Give answers to the questions.

1. The eyes of dragonflies are almost the size of their heads. They provide these insects with excellent vision, which is not characteristic of many members of the insect class. What can explain the good development of the organs of vision in a dragonfly?

(Dragonflies catch small insects in flight, their eyes are indispensable helpers in hunting. Good eyesight is a sign of an insect’s adaptability to a predatory lifestyle.)

2. To find out the method of orientation of the larvae of the cockchafer in the soil, the following experiment was carried out. Carbon dioxide was injected into the soil with a syringe. The larvae began to move towards the injection site. What hypothesis formed the basis of this experience?

(The experience is based on the assumption that the larvae of the cockchafer locate the roots of the plants they feed on by the carbon dioxide released during respiration)

II. Studying new material

Exercise. Make a table

Squad name Detachment signs Representatives
Butterflies (Lepidoptera)
Homoptera
Diptera
Fleas

Job . Reproduction and development of butterflies.

  1. Read the text on page 80, look at picture No. 67, give answers to the questions
  2. Why are butterflies classified as insects with complete metamorphosis?
  3. What kind of life do caterpillars lead?
  4. What is the external structure of the caterpillar (body shape, body color, mouth apparatus)

III. Consolidation of the studied material.

Task number 1

What order do the following insects belong to?

  1. house fly (dipterous)
  2. White cabbage (lepidoptera)
  3. Cicada striped (Hydroptera)
  4. Human flea (fleas)
  5. Common aphid (Hydroptera)
  6. Malarial mosquito (Diptera)
  7. Silkworm (lepidoptera)
  8. Horsefly bull (dipterous)
  9. Citrus whitefly (Hydroptera)
  10. Gooseberry moth (lepidoptera)

Task number 2. Choose the correct answer.

  1. Butterflies have mouthparts:

a) licking

b) chewing

c) sucking

d) piercing-sucking

2. Butterflies have:

a) two pairs of membranous wings

b) two pairs of wings covered with scales,

c) one pair of membranous wings,

d) two pairs of transparent wings

3. Butterflies have development:

a) straight

b) with incomplete transformation,

c) with complete transformation.

4. Homoptera have oral apparatus:

a) licking

b) chewing

c) piercing-sucking,

d) sucking

5. Homoptera have:

a) two pairs of scaly wings,

b) two pairs of transparent wings,

c) two pairs of membranous wings.

d) don’t have wings

6. Homoptera have development:

a) straight

b) with incomplete transformation,

c) with complete transformation.

7. Diptera have oral apparatus:

a) chewing

b) licking

c) piercing-sucking,

d) sucking

8. Diptera have:

a) two pairs of membranous wings;

b) two pairs of transparent wings;

c) one pair of membranous wings,

d) two pairs of wings covered with scales

9. Diptera development:

a) direct;

b) with incomplete transformation;

c) with complete transformation.

10. Fleas have oral apparatus:

a) chewing

b) piercing – sucking,

c) licking

d) gnawing licking

11. Flea development:

a) complete transformation

b) straight

c) with incomplete transformation.

12. For fleas:

a) two membranous wings,

b) one pair of wings,

c) no wings

d) two pairs of transparent wings

in b in in b b b,c in in b a in

Task number 3.

Solve a biological problem.

A. If you disturb the caterpillar of the cabbage white, then it begins to secrete a caustic liquid from its mouth. What is the significance of such a feature of the behavior of the caterpillar?

( Isolation of a corrosive liquid – a protective device of cabbage white caterpillars)

B. The most common species on Earth is the housefly. It has been proven that this insect originally lived in tropical latitudes, and the best temperature for fly reproduction is +25 degrees. What features of the biology of the housefly allowed the insect to spread widely on Earth, including in northern latitudes?

(High fertility, settling in and around a person’s dwelling, moving with people, falling into a state of hibernation during an unfavorable period (in winter)

Q. You can often hear the opinion: “Is it really impossible for modern science to find means to destroy mosquitoes, because they bring so much trouble to people and animals?” Imagine that such a remedy is found. Will a person do the right thing if he uses it? Why?

(Wrong. Mosquitoes occupy a certain place in the community of organisms: they feed on adults, for example, birds, larvae and pupae of mosquitoes – aquatic animals.)

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