Energy Flow in Ecosystems
Explore the fundamental principles of energy flow in ecosystems, including photosynthesis, cellular respiration, and trophic levels, for Grade 12 Biology.
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Energy Flow in Ecosystems
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Date:
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Read each question carefully and answer to the best of your ability. Show all your work for calculations.
1. Which of the following best describes the primary source of energy for most ecosystems on Earth?
Geothermal energy
Chemical energy from rocks
Solar energy
Nuclear energy
2. What is the approximate percentage of energy transferred from one trophic level to the next in most ecosystems?
1%
10%
50%
90%
3. The process by which producers convert light energy into chemical energy is called .
4. Organisms that obtain energy by consuming other organisms are known as .
5. In a food web, arrows indicate the direction of flow.
6. Briefly explain the difference between a food chain and a food web.
7. Analyze the food web below and answer the questions that follow.
a. Identify one producer:
b. Identify one primary consumer:
c. Identify one secondary consumer:
8. Decomposers play a crucial role in recycling nutrients back into the ecosystem.
True
False
9. All energy transferred between trophic levels is fully utilized by the next level.
True
False
10. Describe the main inputs and outputs of both photosynthesis and cellular respiration, and explain how these two processes are interconnected in the flow of energy within an ecosystem.
Photosynthesis Overview
Cellular Respiration Overview
