Energy Flow in Ecosystems
Explore the concepts of energy flow, food chains, food webs, and ecological pyramids in this Grade 7 Science worksheet.
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Energy Flow in Ecosystems
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Read each question carefully and answer to the best of your ability. Good luck!
1. What is the primary source of energy for almost all ecosystems on Earth?
Geothermal energy
The Sun
Chemical reactions
Decomposers
2. An organism that produces its own food, usually through photosynthesis, is called a:
Consumer
Decomposer
Producer
Herbivore
3. A food chain shows how energy is transferred from one organism to another, starting with a .
4. Organisms that eat other organisms are called .
5. A food consists of many interconnected food chains in an ecosystem.
6. Explain the difference between a food chain and a food web.
7. Observe the food web below and answer the questions that follow.
a) Name one producer in this food web.
b) Name one primary consumer in this food web.
c) Name one secondary consumer in this food web.
d) If the population of rabbits suddenly decreased, what impact might this have on the foxes? Explain your answer.
8. Energy flows in a single direction through an ecosystem.
True
False
9. Decomposers are important because they return nutrients to the soil.
True
False