Grade 3 Science · Ecosystems
Explore Grade 3 Science with five 10-question practice tests on habitats, biotic and abiotic factors, food chains, producers, consumers, decomposers, and ecosystem relationships.
These Grade 3 Science practice tests help students understand how living things interact with one another and with nonliving parts of their habitats. Students practice food chains, energy flow, and ecosystem roles.
Look for clues about whether something is living or nonliving. Then identify how organisms get energy, what resources their habitats provide, and how a change in one population can affect others.
For more Grade 3 Science practice, return to the Grade 3 Science category.
2. Test
A 10-question Grade 3 Science practice test on ecosystems, habitats, biotic and abiotic factors, producers, consumers, decomposers, and food chains.
Read each ecosystem question carefully. Identify the living or nonliving part, the organism role, or the relationship described, then choose the best answer.
Please select an answer first.
Correct answer: A
The correct answer is Grass.
The plant is the producer and begins the food chain by making food.
Please select an answer first.
Correct answer: B
The correct answer is The grass uses sunlight to make food, and the grasshopper eats the grass..
Plants capture sunlight energy, which can then move to animals that eat them.
Please select an answer first.
Correct answer: C
The correct answer is Fox.
The fox is the predator because it hunts and eats the rabbit.
Please select an answer first.
Correct answer: D
The correct answer is A fungus growing on a fallen log.
Fungi break down dead material, so they act as decomposers.
Please select an answer first.
Correct answer: A
The correct answer is Sun → grass → rabbit → fox.
Energy begins with the Sun, moves to the plant, then to animals that eat.
Please select an answer first.
Correct answer: B
The correct answer is A fish that eats small insects.
The fish is a consumer because it gets energy by eating insects.
Please select an answer first.
Correct answer: C
The correct answer is Algae.
Algae are plant-like producers that make food using sunlight.
Please select an answer first.
Correct answer: D
The correct answer is Many animals would have less food and energy..
Plants are producers, so losing them reduces food and energy for consumers.
Please select an answer first.
Correct answer: A
The correct answer is Several connected food chains in an ecosystem.
A food web shows many feeding relationships that connect food chains.
Please select an answer first.
Correct answer: B
The correct answer is Energy moves from the Sun to producers and then to consumers..
Plants capture solar energy, and that energy moves to organisms that eat them.
An ecosystem includes living things and the nonliving parts of an area that interact with one another.
A producer makes its own food, while a consumer gets energy by eating plants or other organisms.
The page includes five mini tests with 10 questions each, for 50 Grade 3 Ecosystems questions in total.
