Grade 3 · Science · Life science

3rd Grade Food Chains and Ecosystems worksheets

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Food Chains and Ecosystems

Grade 3 Science Worksheet

NameDate

Circle the answer.

1.
Which food chain is in the right order for a pond?
- algae → fish → snail
- algae → snail → fish
- fish → snail → algae
- snail → algae → fish
2.
In grass → grasshopper → frog → snake, which animal eats the grasshopper?
- hawk
- snake
- frog
- grass
3.
In phytoplankton → krill → penguin, what would happen to the penguins if the krill disappeared?
- the penguins would start making food
- the penguins would have less food
- the penguins would have more food
- the phytoplankton would disappear too
4.
What would happen in a forest with no decomposers?
- there would be more sunlight
- plants would grow faster
- animals would need less food
- dead plants and animals would pile up
5.
Where does the energy in a hawk's food first come from?
- the rabbit
- the sun
- the soil
- the hawk's nest
6.
Which pair shows a predator and its prey?
- grass and rabbit
- owl and mouse
- mushroom and log
- mouse and seeds
7.
A desert has cactus, mice, snakes and hawks. Which is the producer?
- snake
- hawk
- cactus
- mouse
8.
A meadow is mowed and the tall grass is gone. Which animal would most likely have a harder time surviving there?
- bats that hunt at night
- hawks that fly high above
- earthworms deep in the soil
- grasshoppers that eat the grass
9.
Why are producers important to every food chain?
- they break down dead things
- they eat the most animals
- they are the largest living things
- they bring energy from the sun into the chain
10.
In leaves → caterpillar → bird → fox, which is the producer?
- leaves
- bird
- caterpillar
- fox

3rd Grade Food Chains and Ecosystems worksheet 1 – printable PDF — Download PDF: 1 2 3 4 5 6

About this worksheet

Food chains and ecosystems show how energy moves from plants to animals and decomposers, and how a habitat change affects the living things in it helps third graders connect observations with scientific explanations instead of memorizing isolated facts. Students may read arrows as decoration or start with a predator instead of the producer that captures energy first. This worksheet uses short evidence-based situations so students must read the setup, identify the pattern, and choose the answer that fits the science idea named in the title. Students order food chains, identify producers, consumers and decomposers, and predict what happens to populations when a habitat or food source changes.

Support versions use familiar examples and direct wording. Standard and challenge versions add closer distractors and require more comparison. Encourage your child to point to the evidence in the prompt before choosing an answer. If the answer does not explain the observation or solve the stated problem, it is probably a distractor. That habit builds careful science reasoning and prepares students for longer investigations.