Energy Flow in Ecosystems
This worksheet covers the fundamental concepts of energy flow within ecosystems, including food chains, food webs, trophic levels, and ecological pyramids, suitable for Grade 9 science students.
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Energy Flow in Ecosystems
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Read each question carefully and answer to the best of your ability. Show all your work for calculations.
1. What is the primary source of energy for almost all ecosystems on Earth?
Geothermal energy
Chemical energy
Solar energy
Nuclear energy
2. Which of the following organisms is a producer?
Lion
Grass
Deer
Mushroom
1. Organisms that produce their own food are called .
2. A series of organisms each dependent on the next as a source of food is known as a .
3. Only about percent of energy is transferred from one trophic level to the next.
1. Decomposers are essential for recycling nutrients back into the ecosystem.
True
False
2. Producers obtain energy by consuming other organisms.
True
False
1. Explain the difference between a food chain and a food web.
2. Describe the role of decomposers in an ecosystem.
Observe the food web below and answer the questions that follow.
1. Identify two producers in the food web.
2. Name one primary consumer and one secondary consumer.
Match each term on the left with its definition on the right.
1. Producer
a. An organism that consumes other organisms for energy
2. Consumer
b. An organism that breaks down dead organic matter
3. Decomposer
c. An organism that produces its own food
Use the words below to complete the sentences.
1. A is an organism that only eats plants.
2. The total mass of organisms in a given trophic level is called .
3. Each level in a food chain or food web is referred to as a .
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