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 3 body sections › Head, thorax, and abdomen  6 legs › Attached to the thorax  1 pair of antennae  Usually 1 or 2 pairs of wings › Attached to the.

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Presentation on theme: " 3 body sections › Head, thorax, and abdomen  6 legs › Attached to the thorax  1 pair of antennae  Usually 1 or 2 pairs of wings › Attached to the."— Presentation transcript:

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2  3 body sections › Head, thorax, and abdomen  6 legs › Attached to the thorax  1 pair of antennae  Usually 1 or 2 pairs of wings › Attached to the thorax

3  Sense organs are located on the head › Eyes and antennae  Abdomen contains the internal organs  2 large compound eyes which contain lenses › Good for seeing movement  Have simple eyes too › Distinguish between light and dark

4  Obtain oxygen through a system of tubes  Tubes lead to openings in the insect’s exoskeleton  Air enters the body through the tubes and travels to the cells

5  Tiny, hard-shelled, fertilized eggs  Go through metamorphosis to become an adult  2 different types of metamorphosis

6  2 types of metamorphosis 1. Complete metamorphosis 2. Gradual metamorphosis

7  Complete metamorphosis › 4 dramatically different stages  Egg  Larva  Pupa  Adult

8  Complete Metamorphosis › Larva – immature form of an animal that looks different than the adult  Specialized for eating and growing › Pupa  Insect is enclosed in a protective covering and gradually changes from a larva to an adult › After it has completed its development an adult emerges

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10  Gradual metamorphosis › Has no distinctly different larval stage › Egg hatches into a stage called a nymph  Nymph – often resembles the adult insect › A nymph may molt several times before becoming an adult

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12  Eat plants and parts of plants (leaves and nectar)  Eat products made from plants such as paper  Feed on animals too › Fleas and mosquitoes feed on blood of living animals › Dung beetles feed on animal droppings

13  Burying beetles feed on decaying bodies of dead animals  Mouthparts are adapted for a specific way of getting food

14  Hard exoskeleton  Run or fly away  Smell or taste bad  Painful stings

15  Most common defense is camouflage › Blend in to their environment  Resemble other animals › Example the spots on wings of some moths resemble large eyes › When predators see these eyes they avoid them

16  For every person alive scientists estimate that there are at least 200 million living insects  Insects impact our lives › Damage crops › Carry microorganisms that cause diseases  The vast majority are harmless or beneficial to humans

17  Insects are harmless or beneficial › Bees make honey › Silkworm larvae spin the fibers to make silk › Some insects prey on harmful insects › Some enable food crops › We need insects to have food to eat

18  We try to get rid of harmful pests using pesticides › This can also kill harmless / helpful pests  Overtime insect populations become resistant to pesticides

19  A search for another way to deal with harmful insects › Biological controls  Introduce natural predators or diseases  Ex: Ladybugs added to fields to kill aphids  Soil can be treated with bacteria that are harmless to humans but cause diseases in the larvae of pest insects like the Japanese beetle › Biological controls only kill specific pests and are therefore less damaging to the environment


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