Ecosystems Review

Frogs often live in freshwater ponds where they feed on insects and lay their eggs in the water. Sometimes they are eaten by snakes. Frogs would leave the area if -

• there were more insects.

• the snakes all died out.

• the water in the pond dried up.

• there was a little more rain.

All of the following are changes to an environment that could help an animal thrive EXCEPT-

• more of the kind of plants the animal eats.

• fewer predators that eat the animal.

• less rain during the spring and summer.

• removal of animals that eat the same food.

How could a forest fire help some organisms? A forest fire could help–

• remove the trees that birds use to build nests.

• clear dead plants to allow new plants to grow.

• scare away small mammals that are food for wolves.

• burn the organic matter from soil where worms live.

Which of the following is represented in the diagram above?

• Evaporation of water

• Transfer of energy

• Reflection of light

• Animal life cycle

What is most likely the first thing to result from having fewer field mice in the food chain pictured here?

• The snakes would have to find another food source.

• The plants that make seeds would decrease in number.

• The eagles would have to fly away to a location.

• The mice would eat many more kinds of seeds.

A new fish that also eats plants is introduced into a pond. What changes would occur to this pond ecosystem?

• The large fish population will decrease.

• The plant population will decrease.

• The small fish population will increase.

• The new fish population will decrease.

Which of the following correctly shows how energy moves through a food chain?

• sun--> meat eaters--> plants--> plant eaters

• sun--> plants--> plant eaters--> meat eaters

• sun--> meat eaters--> plant eaters--> plants

• sun--> plants--> meat eaters--> plant eaters

Based on the food chain illustrated above, what effect would be the most likely direct result of increasing the number of fish?

• Beetles would have trouble finding food.

• There would be more kinds of plants.

• The population of beetles would decrease.

• Plants would no longer survive in this habitat.

What is an ecosystem?

• A system of overlapping food chains

• All the populations that live in the same place

• The living and nonliving things that interact in an environment

• The place where a living thing makes its home

Which of the following is not provided to a raccoon by its ecosystem?

• Air

• Shelter

• Food

• None of the other answer choices