SCOTTS FORESMAN SCIENCE - Unit A Chapter 2 Lesson 2 Notes

1. 12-12-12
Chapter 2 - Lesson 2
How do Spiders and Insects Grow?
Vocabulary
nymph larva pupa
1. nymph - a stage in an insect life cycle
between egg and adult that looks like an
adult that has no wings.
2. larva - a young animal that has a
different shape than the adult.
3. pupa - the stage in the insect life cycle
between larva and adult.

2. Chapter 2 - Lesson 2
How do Spiders and Insects Grow?
Quick Quiz
1. What is an arachnid? An arachnid is an
animal with two body parts and eight legs;
includes spiders).
2. How would you describe the body of an
insect? The body of an insect has three main
things: six legs, 3 main body parts & wings
3. Sequence (put in order) the steps that make
up the spider's life cycle (A36) There are 5
steps in the spider life cycle. They are: egg sac,
baby spiders grow, hatch, adult, reproduce.

3. Science Background
· Spiders are arachnids and have eight legs, two body
segments, and no wings. In sects, another group of
invertebrates, have six legs, three main body segments,
and many have wings.
· A spider life cycle consists of the following events: a spider
makes an egg sac, young spiders grow from eggs in the
egg sac, the spiders hatch and break out of the sac, young
spiders grow into adults and produce offspring of their own.
· The three-stage insect life cycle (incomplete
metamorphosis) includes egg, nymph, and adult. The
nymphs of many insects, such as grasshopppers, look like
their parents. However, the nymphs of some insects, such
as dragonflies, differ greatly from their parents.

5. 1-2-12
Raise Questions p. 38-39
1. What is a larva? A larva is...
2. What is a pupa? A pupa is

6. Chapter 2 Lesson 2 - How Do Spiders
and Insects Grow
Review Questions page A39
1. How does the body of a young spider compare with the
body of an adult spider?
2. How is a three-sage insect life cycle different from a four-
stage insect life cycle?
3. It takes a caterpillar about two hours to hatch from its
shell. Suppose is started hatching at 12:15 P.M. At what
time would it finish?