Ecosystems & Interactions Review - 3rd Grade Science TEKS

Observe the picture below. What are the physical characteristics of the environment?

• everything in the water

• only the air and the twigs

• only the living organisms

• only the nonliving parts

Which activity supports communities in an ecosystem?

• building roads

• digging ditches

• water a lawn

• throwing trash in ponds

Describe the physical characteristics of a schoolyard environment.

• water, cows, mud

• air, floors, people

• air, soil, sunlight

• water, insects, lions

Observe the picture below. How do the physical characteristics of the environment support a community within this ecosystem?

• The frog and the lily pad are the same color.

• The mosquitoes are good at flying around the frog.

• The frog lives with other frogs.

• The lily pad and frog both need water to grow.

Which word describes all the deer living in the same area?

• habitat

• ecosystems

• population

• community

Which environment would best support a population of cactuses?

• a grassland

• a desert

• an ocean

• a rain forest

Which sentence describes how the physical characteristics of an environment can support a deer population in a forest ecosystem?

• Deer have shade from the sunlight.

• Deer drink water from a stream.

• Deer hide among the trees and eat twigs and bark.

• Deer smell the leaves and know they are home.

Describe how the physical characteristics of an Ocean environment support communities within a marine ecosystem.

• The warm breezes helps the birds fly.

• The blue color of water helps fish hide.

• A lot of sunshine helps the plants stay green.

• The sand provides a home from some fish and crabs.

Describe the flow of energy in a food chain by choosing the answer that shows the correct flow of energy.

• oak tree ---> human ---> grass

• grass ---> chicken ---> human

• human ---> chicken ---> grass

• chicken ---> grass ---> human

Look at the picture below. Identify what is wrong with the flow of energy in the food chain.

• A food chain cannot end with a consumer.

• A food chain cannot end with a decomposer.

• A food chain cannot flow from producer to producer.

• A food chain cannot flow from consumer to consumer.