Grade 4life scienceOriginal practice

Ecosystems: Food Chains, Producers, and Consumers

Trace the flow of energy from the sun through producers, herbivores, carnivores, and decomposers. Includes diagrams and answer key.

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Grade 4 · science

Ecosystems: Food Chains, Producers, and Consumers

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Grade 4 · science · continued

Ecosystems: Food Chains, Producers, and Consumers

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Read each question about ecosystem energy flow and select the best answer.

1.In the grassland food chain: Sun ➔ Clover ➔ Rabbit ➔ Red Fox, which organism is the PRODUCER?

ARed Fox

BRabbit

CClover (Plant)

DSun

2.What do the arrows in a food chain diagram (A ➔ B) represent?

AWhich animal is bigger

BThe direction that energy and nutrients flow

CWhich animal can run faster

DThe path an animal walks to find water

3.Mushrooms, earthworms, and bacteria break down dead leaves and fallen trees into rich soil. What ecological role do they fill?

AApex predators

BPrimary producers

CDecomposers

DHerbivores

Grade 4 · science · Answer key

Ecosystems: Food Chains, Producers, and Consumers

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Grade 4 · science · Answer key · continued

Ecosystems: Food Chains, Producers, and Consumers

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Read each question about ecosystem energy flow and select the best answer.

1.In the grassland food chain: Sun ➔ Clover ➔ Rabbit ➔ Red Fox, which organism is the PRODUCER?

C. Clover (Plant)

Clover is a green plant that produces its own food using sunlight through photosynthesis, making it the producer.

2.What do the arrows in a food chain diagram (A ➔ B) represent?

B. The direction that energy and nutrients flow

The arrow points into the mouth of the consumer, representing the flow of energy and nutrients.

3.Mushrooms, earthworms, and bacteria break down dead leaves and fallen trees into rich soil. What ecological role do they fill?

C. Decomposers

Decomposers break down dead organic matter and recycle essential nutrients back into the ecosystem.

About this practice

Grade 4 · science · Matching answer key included · US Letter and A4

US Letter practice PDF ↓ · Answer PDF ↓A4 practice PDF ↓ · Answer PDF ↓

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Ecosystems: Food Chains, Producers, and Consumers: first student practice page

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Teaching guide, sample answers and curriculum references

Before you begin

Recognize that living things obtain energy in different ways.

How to use this worksheet

Model the target skill: differentiate producers (plants), primary consumers (herbivores), secondary consumers (carnivores), and decomposers. Use the first task as a guided example before asking for an independent response.
Check readiness first: Recognize that living things obtain energy in different ways.
Discuss an incorrect response using this distinction: Food-chain arrows show the direction of energy transfer, from the eaten organism toward the consumer.

A common mistake to discuss

Food-chain arrows show the direction of energy transfer, from the eaten organism toward the consumer.

What to practice next

Extend a chain with a justified organism and explain the new arrow.

Sample question and answer

In the grassland food chain: Sun ➔ Clover ➔ Rabbit ➔ Red Fox, which organism is the PRODUCER?

A. Red Fox
B. Rabbit
C. Clover (Plant)
D. Sun

Answer: C. Clover is a green plant that produces its own food using sunlight through photosynthesis, making it the producer.

Intended curriculum references: NGSS.4-LS1-1 · NGSS.5-PS3-1. These references describe learning goals; they are not endorsements.

Published 2026-10-02; updated 2026-10-02. Original MakeWorksheet practice. Automated consistency checks support publication; independent subject-specialist review is not recorded. Read our editorial policy.

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