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Grade 6 Science · Food Webs and Energy Flow

Grade 6 Food Webs and Energy Flow Practice Test

Build Grade 6 Science skills with five 10-question practice tests on food chains, food webs, trophic levels, energy pyramids, producers, consumers, decomposers, and energy transfer.

Food Webs and Energy Flow Practice Tests

These Grade 6 Science practice tests help students model how energy moves through ecosystems. Students practice reading food chains and food webs, identifying producers and consumers, comparing trophic levels, interpreting energy pyramids, explaining decomposer roles, and predicting how population changes affect connected organisms.

Skills covered

  • Reading arrows and relationships in food chains and food webs
  • Identifying producers, primary consumers, secondary consumers, and decomposers
  • Comparing trophic levels and energy pyramids
  • Explaining why energy decreases as it moves through a food web
  • Distinguishing energy flow from matter cycling
  • Using evidence to predict effects of population and environmental changes

How to use these practice tests

Start at the producer and follow each arrow toward the organism that receives energy. Identify the trophic level of each organism, then consider how limited energy and resources affect the number of organisms at higher levels. Remember that energy flows through an ecosystem while materials are recycled by decomposers.

For more Grade 6 Science practice, return to the Grade 6 Science category.

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Grade 6 Food Webs and Energy Flow Practice Tests

A 10-question Grade 6 Science practice test on food chains, food webs, trophic levels, energy pyramids, producers, consumers, decomposers, and energy transfer.

Trace energy through food chains and webs, identify trophic levels, compare energy and matter movement, and use evidence to explain ecosystem changes.

10 Questions
0/10 Questions0 %
Correct 0
Incorrect 0
Unanswered 10
1. QuestionMultiple choice

What would most likely happen if all grass in a meadow disappeared?

Please select an answer first.

Correct answer: A

The correct answer is Many herbivores would lose a major food source and their populations could decline..

  1. Identify the feeding relationship: Find the organism that provides energy and the organism that receives it.
  2. Trace the flow: Grass is a producer, so its loss can affect herbivores and the consumers that depend on them.
  3. Check the ecosystem effect: Consider how a population change could affect the other organisms and energy available at each level.

Grass is a producer, so its loss can affect herbivores and the consumers that depend on them.

2. QuestionMultiple choice

If rabbit numbers increase, what could happen to the grass in the same ecosystem?

Please select an answer first.

Correct answer: B

The correct answer is Grass may decrease because more rabbits are feeding on it..

  1. Identify the feeding relationship: Find the organism that provides energy and the organism that receives it.
  2. Trace the flow: A larger rabbit population can place greater feeding pressure on its food source.
  3. Check the ecosystem effect: Consider how a population change could affect the other organisms and energy available at each level.

A larger rabbit population can place greater feeding pressure on its food source.

3. QuestionMultiple choice

What could happen to a hawk population if its main prey became scarce?

Please select an answer first.

Correct answer: C

The correct answer is The hawk population could decrease or the hawks could compete more for food..

  1. Identify the feeding relationship: Find the organism that provides energy and the organism that receives it.
  2. Trace the flow: A scarce prey population reduces food availability for the predator.
  3. Check the ecosystem effect: Consider how a population change could affect the other organisms and energy available at each level.

A scarce prey population reduces food availability for the predator.

4. QuestionMultiple choice

Why can removing one species affect several others in a food web?

Please select an answer first.

Correct answer: D

The correct answer is The species may be both a food source and a predator for different organisms..

  1. Identify the feeding relationship: Find the organism that provides energy and the organism that receives it.
  2. Trace the flow: Overlapping relationships allow changes to spread through many parts of the web.
  3. Check the ecosystem effect: Consider how a population change could affect the other organisms and energy available at each level.

Overlapping relationships allow changes to spread through many parts of the web.

5. QuestionMultiple choice

Which change could increase algae growth in a pond?

Please select an answer first.

Correct answer: A

The correct answer is An increase in sunlight and nutrients entering the water.

  1. Identify the feeding relationship: Find the organism that provides energy and the organism that receives it.
  2. Trace the flow: Algae are producers that can grow more when light and nutrients are available.
  3. Check the ecosystem effect: Consider how a population change could affect the other organisms and energy available at each level.

Algae are producers that can grow more when light and nutrients are available.

6. QuestionMultiple choice

What may happen after excessive algae growth blocks light in a pond?

Please select an answer first.

Correct answer: B

The correct answer is Other aquatic producers may grow less, and oxygen conditions may change..

  1. Identify the feeding relationship: Find the organism that provides energy and the organism that receives it.
  2. Trace the flow: Dense algae can block light and later affect oxygen and other organisms.
  3. Check the ecosystem effect: Consider how a population change could affect the other organisms and energy available at each level.

Dense algae can block light and later affect oxygen and other organisms.

7. QuestionMultiple choice

How do decomposers affect energy and matter in a food web?

Please select an answer first.

Correct answer: C

The correct answer is They recycle matter from dead organisms, but energy used by organisms is eventually released as heat..

  1. Identify the feeding relationship: Find the organism that provides energy and the organism that receives it.
  2. Trace the flow: Decomposers return materials to the environment, while energy flows through and is dissipated.
  3. Check the ecosystem effect: Consider how a population change could affect the other organisms and energy available at each level.

Decomposers return materials to the environment, while energy flows through and is dissipated.

8. QuestionMultiple choice

Which statement correctly compares energy flow and matter cycling?

Please select an answer first.

Correct answer: D

The correct answer is Energy moves through an ecosystem, while matter can be reused and cycled..

  1. Identify the feeding relationship: Find the organism that provides energy and the organism that receives it.
  2. Trace the flow: Energy has a one-way flow, while materials such as nutrients can move repeatedly among components.
  3. Check the ecosystem effect: Consider how a population change could affect the other organisms and energy available at each level.

Energy has a one-way flow, while materials such as nutrients can move repeatedly among components.

9. QuestionMultiple choice

Which evidence would best support a claim that two species compete for food?

Please select an answer first.

Correct answer: A

The correct answer is Both species eat the same limited plant, and each population changes when the plant becomes scarce..

  1. Identify the feeding relationship: Find the organism that provides energy and the organism that receives it.
  2. Trace the flow: Shared use of a limited food resource is evidence of competition.
  3. Check the ecosystem effect: Consider how a population change could affect the other organisms and energy available at each level.

Shared use of a limited food resource is evidence of competition.

10. QuestionMultiple choice

Why can biodiversity make a food web more resilient?

Please select an answer first.

Correct answer: B

The correct answer is If one food source declines, some organisms may have other feeding relationships..

  1. Identify the feeding relationship: Find the organism that provides energy and the organism that receives it.
  2. Trace the flow: Multiple pathways can help an ecosystem continue functioning when one species or resource changes.
  3. Check the ecosystem effect: Consider how a population change could affect the other organisms and energy available at each level.

Multiple pathways can help an ecosystem continue functioning when one species or resource changes.

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Frequently asked questions about Grade 6 Food Webs and Energy Flow

What topics are covered?

The page covers food chains, food webs, arrows, producers, consumers, decomposers, trophic levels, energy pyramids, energy transfer, matter cycling, and population changes.

How should students read a food web?

Begin with a producer and follow each arrow toward the organism that receives energy. Then identify the feeding role and consider how a change could affect connected populations.

How many questions are on this page?

The page includes five mini tests with 10 questions each, for 50 Grade 6 Food Webs and Energy Flow questions in total.