Insects Chapter 10 Section 3

Body Structure three sixone one or two Arthropods with three body sections, six legs, one pair of antennae, and usually one or two pairs of wings head thoraxabdomen Three body sections are the head, thorax, and abdomen

Body Sections: Head Insect’s sense organs found in head (eyes/antennae) Two large compound eyes Two large compound eyes many lenses keen at seeing movement ◦Compound eyes contain many lenses, keen at seeing movement

Body Structure: Thorax midsection Insect’s midsection wings and legs are attached Where wings and legs are attached Only invertebrates that can fly Only invertebrates that can fly long distances Can travel long distances to find mates, food, and new places to live

Body Structure: Abdomen Internal organs Internal organs found in the abdomen Small holes outside of abdomen allow air Small holes outside of abdomen allow air, which contains oxygen, to enter the body through tubes

Obtaining Food “If it is living, or if it once was living, some kind of insect will eat it.” “If it is living, or if it once was living, some kind of insect will eat it.” Mouthparts are adapted for a highly specific way of getting food

Life Cycle Begin life as tiny, hard-shelled, fertilized eggs Either go through… ◦Complete metamorphosis ◦Gradual metamorphosis

Complete Metamorphosis 4 different stages: 4 different stages: egg, larva, pupa, adult egg Insect begins life as a tiny, hard-shelled fertilized egg larvae The eggs hatch into larvae (usually look like worms) pupa Larva will then enter next stage and become a pupa, insect is enclosed in a protective covering ◦Pupa does not eat/barely moves, but it is NOT resting adult When development is complete, adult leaves pupal case

Gradual Metamorphosis No distinct larval stage Egg hatches into a stage called a nymph ◦Nymph: usually looks like the adult insect without wings Nymph may molt several times before becoming an adult Grasshoppers, termites, cockroaches, dragonflies

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