Ecosystems and Populations Assessment for Grade 4

What is a population?

• A group of different species living in the same area

• All living and nonliving things in an area

• A group of the same species living in the same area

Which of these is an example of a community?

• All the deer in a forest

• All the plants and animals living together in a pond

• Only the fish in a lake

What do producers need to make their own food?

• Other animals

• Sunlight, water, and air

• Just water

In a food chain, what happens if the population of prey increases?

• The predator population usually decreases

• Nothing changes in the ecosystem

• The predator population usually increases

What is a consumer?

• An organism that makes its own food

• An organism that breaks down dead things

• An organism that eats other organisms

How do decomposers help an ecosystem?

• They make food from sunlight

• They break down dead organisms and return nutrients to the soil

• They eat only plants

What is competition in an ecosystem?

• When animals play together

• When organisms work together

• When organisms help each other find food

• When organisms struggle for the same resources

Which shows a correct food chain?

• Snake → Mouse → Hawk

• Grass → Rabbit → Fox

• Sun → Fish → Plant

• Deer → Grass → Wolf

What is a habitat?

• Only where an animal sleeps

• Where an organism gets its food

• Where an organism lives and meets all its needs

• Only where plants grow

How do plants help animals in an ecosystem?

• They provide only water

• They provide food and shelter

• They eat harmful insects

• They clean the water