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Grade 4scienceUsing simple food webs to predict how a change in one population can affect other organisms in an ecosystem.

Changing Food Webs

Analyze food webs and ecosystem changes in 10 problems with an answer key. Free printable PDF for Grade 4.

10 problems · Standards: 5-LS2-1 · Difficulty: medium

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✅ Answer key included · ✅ Free for home & classroom use

Highlights

Grade: Grade 4
Subject: science
Topic: Using simple food webs to predict how a change in one population can affect other organisms in an ecosystem.
Pages: 3 · worksheet + answer key
Answer key: ✅ Included
Class time: about 15 min

1. A rabbit eats grass. A fox eats the rabbit. If the grass population decreases, what will most likely happen to the rabbit population?
2. Hawks eat mice. Mice eat seeds. If the hawk population increases, what will most likely happen to the mouse population?
3. Caterpillars eat leaves. Birds eat caterpillars. Snakes eat birds. If the caterpillar population increases, what will most likely happen to the bird population?
4. Deer eat plants. Wolves eat deer. If all the wolves disappear from the area, what will most likely happen to the deer population?
5. Grasshoppers eat grass. Frogs eat grasshoppers. Herons eat frogs. If the grass population decreases, what will most likely happen to the frog population?
6. Shrimp eat algae. Small fish eat shrimp. Large fish eat small fish. If the shrimp population increases, what will most likely happen to the algae population?

Showing 6 of 10 problems. The free PDF includes every problem plus the full answer key.

The free PDF includes all 3 pages — every problem plus the full answer key.

10 problems across 3 pages (worksheet + answer key)
Answer key included — every answer, ready to check
Standards: 5-LS2-1
Skill: Using simple food webs to predict how a change in one population can affect other organisms in an ecosystem.
Suggested use: classwork, homework, or sub plans

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