Plants and Animals

Scientists classify insects, spiders, and crabs as ______________.

• vertebrates
• reptiles
• arthropods
• mollusks

Something that causes a reaction in a living thing is called a (n) _____________.

• stimulus
• behavior
• instinct
• inherited characteristic

Plants are green because they contain ___________.

• sugar
• oxygen
• nutrients
• chlorophyll

Giraffes with longer necks have an advantage in _________________.

• competition
• adaptation
• nutrition
• protection

Which adaptation might help protect a plant from being eaten?

• a flower that looks like a bee
• a waxy coating
• a substance that attracts insects
• a thorny stem

Which is one characteristic that scientists use to classify plants?

• chloroplasts
• photosynthesis
• reproduction
• chlorophyll

Which adaptation would be most useful to an animal that eats nectar from plants?

• fins
• wings
• fast legs
• short beak

Which is an example of an instinct?

• A spider spins webs.
• A child speaks Chinese.
• A sea lion balances a ball on its nose.
• A dog stays away from skunks.

Which is a waste product of photosynthesis?

• oxygen
• carbon dioxide
• sugar
• sunlight

What is the function of the sepals of a flower?

• make pollen
• make petals
• make eff cells
• protect flower buds