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Science Chapter 2
Bob Jones University; 4th Grade Science Terms Ch. 2; Insects and Spiders
| Term | Definition |
|---|---|
| anthropod | means "jointed foot"; a group of invertebrates with an exoskeleton, separate body parts, and jointed legs |
| exoskeleton | a hard, outer covering on an arthropod |
| molt | to shed |
| insect | arthropods with three body sections, and six legs |
| thorax | the middle body section of an insect's body; the legs and wings are on this section |
| abdomen | the last section of an insect's body; stingers are found here; digestion happens here |
| proboscis | a long tube in an insect's head with which an insect can suck liquid |
| metamorphosis | a process of change in the form of an animal as it grows |
| incomplete metamorphosis | egg ----> nymph ----> adult |
| complete metamorphosis | egg ----> larva ----> pupa -----> adult |
| instinct | a knowledge or skill an animal is born with |
| colony | a group of insects that live together |
| spiders | arthropods with two body parts and eight legs |
| arachnids | a group of arthropods that includes spiders; other types of arthropods are scorpions, daddy long legs, mites, and ticks |
| pedipalps | two leg-like parts on a spiders head that it uses to hold its prey while eating |
| spinnerets | tiny tubes on a spider's abdomen that produce its silk |
| invertebrate | an animal with no backbone |