Simple Solutions Unit 11 (lessons 51-55) 4th Grade

Why do organisms have structures for taking in and letting out air?

• Plants must take in carbon dioxide to make food and to survive.

• Air contains oxygen, and all animals need oxygen to survive.

• Both animals and plants use these structures to eliminate waste.

• all of these

Stomata are on the surface of a plant's leaf. Spiracles are on an insect's body. What do these structures have in common?

• Both are internal structures organisms use for reproduction

• Both are external structures that let air pass in and out

• Both provide food, water, and air for the organisms.

• Both structures help organisms move from place to place.

What are the external structures plants use for reproduction?

• stomata and spiracles

• roots and leaves

• stamen and pistils

• stems and bark

How do external structures help a plant reproduce?

• The structures make it possible for insects to pollinate the plant.

• The structures make it possible for the leaves to make food.

• The structures make it possible for the plant to stay green all year.

• The structures make it possible for the plant to survive without water.

A young plant grows and changes. When it is mature, it grows ____ that contain the plant’s male and female structures . These parts allow the plant to reproduce. A bird, bat, or insect may pollinate the plant. When this happens, the plant may produce a seed, and a seedling can grow.

• flowers

• structures

• pollinate

• reproduce

A young plant grows and changes. When it is mature, it grows flowers that contain the plant’s male and female _____. These parts allow the plant to reproduce. A bird, bat, or insect may pollinate the plant. When this happens, the plant may produce a seed, and a seedling can grow.

• flowers

• structures

• pollinate

• reproduce

A young plant grows and changes. When it is mature, it grows flowers that contain the plant’s male and female structures. These parts allow the plant to ______. A bird, bat, or insect may pollinate the plant. When this happens, the plant may produce a seed, and a seedling can grow.

• flowers

• structures

• pollinate

• reproduce

A young plant grows and changes. When it is mature, it grows flowers that contain the plant’s male and female structures. These parts allow the plant to reproduce. A bird, bat, or insect may ______the plant. When this happens, the plant may produce a seed, and a seedling can grow.

• flowers

• structures

• pollinate

• reproduce