Energy Flow in Ecosystems
Grade 12 science worksheet covering energy flow, food webs, trophic levels, and ecological pyramids.
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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 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 chemosynthesis
Solar energy
Kinetic energy from wind
2. In a typical food web, which organisms occupy the second trophic level?
Producers
Primary consumers
Secondary consumers
Decomposers
3. The process by which producers convert light energy into chemical energy is called .
4. Only about percent of the energy from one trophic level is transferred to the next trophic level.
5. Explain the difference between a food chain and a food web. Why is a food web a more accurate representation of energy flow in most ecosystems?
6. Observe the food web below. Identify two producers, two primary consumers, and one tertiary consumer.
Producers:
Primary Consumers:
Tertiary Consumer:
7. Decomposers are essential for recycling nutrients back into the ecosystem.
True
False
8. An ecological pyramid of biomass typically shows the greatest biomass at the highest trophic level.
True
False
9. Discuss the implications of the 10% rule of energy transfer for human consumption patterns and the sustainability of food production. Consider both terrestrial and aquatic ecosystems in your answer.