unit 7 science review

A plant-eating insect's complete metamorphosis does most of its eating during the ________.

• adult

• larva

• pupil

• egg

Reorder the life cycle of a frog is shown. In stages 3 and 4, the tadpoles —

• mate to produce frog offspring with legs.

  ⊝

• fuse to form eggs that will hatch into a froglet.

• slowly develop legs and begin to lose their tails.

• convert their tails into tongues.

Harvard oaks produce acorns. When acorns are dropped into the soil, they first grow into —

• mature oak trees.

• flowers of oak trees.

• leaves of oak trees.

• seedling oak trees.

The diagram below shows a salamander at various stages in its development.

What is the correct order of the salamander's development cycle?

• X, Z, W, Y

• X, W, Z, Y

• Y, W, Z, X

• Y, Z, W, X

In what stage does reproduction in flowering plants begin?

• Pollination

• Seed formation

• Germination

• Seed dispersal

What is the first part of a plant that grows after a seed is planted?

• shoot

• flower

• root

• fruit

The pictures show an Arctic fox at different times of the year. As the seasons change, so does the fur of the Arctic fox.

Which statement best explains how the Arctic fox's fur changes for the coming winter?

• Its fur becomes all dark to absorb more sunlight.

• Its fur becomes all white to blend into a snowy background.

• Its fur becomes both white and dark to confuse prey.

• Its fur becomes loose and falls out to allow for heat storage.

The picture below shows an African elephant.

Which of the following will NOT help the African elephant live in its environment?

• Large, flat feet that allow it to run away from danger quickly.

• A long trunk to pick up food and water.

• Wrinkles in its skin that hold water close to its body to keep it cool.

• Tusks to fight other animals.

The picture below shows a butterfly in its natural environment.

Which of the following most likely keeps the butterfly from getting eaten by animals in its natural environment?

• length of antannae

• size of wings

• patterns on wings

• points on antannae

What feature of the cactus allows it to survive in a desert with little rain?

• The shallow roots that absorb more of the small amount of rainfall

• The flowers that attract insects to bring water and nutrients

• The spikes that trap water and keep it for the cactus to use later

• The shape of the leaves that absorb water during a rainfall