Energy flow in ecosystems worksheets for Grade 7 Science focus on how energy enters ecosystems, moves through trophic levels, and becomes less available to organisms at higher levels. Using an NGSS framework for Ecosystems: Interactions, Energy, and Dynamics, this resource connects producers, consumers, decomposers, photosynthesis, cellular respiration, and energy pyramids.

Follow Energy Through the Food Web

Students examine how producers such as grasses and algae capture sunlight through photosynthesis and store energy in sugars. They explore how consumers obtain energy by eating other organisms, how decomposers break down dead material and return nutrients, and why energy availability decreases as it moves through trophic levels.

Apply the 10 Percent Estimate

A key focus is using the typical 10 percent energy transfer estimate to reason about energy available between trophic levels. Students work with examples involving 1,000 energy units reaching plants, approximately 100 units reaching primary consumers, and approximately 10 units reaching secondary consumers. They also connect decreasing energy availability with living biomass, populations, and ecosystem productivity.

Multiple Ways to Demonstrate Understanding

The Grade 7 ecosystem worksheet combines a science reading passage with multiple-choice questions, true-or-false statements, short-answer responses, a labeled diagram, a categorization activity, and a short-note task. Students identify organisms by trophic role, explain energy processes, apply energy-transfer calculations, and reason about population effects at higher trophic levels.

Teacher-Ready Materials

• ✔️ Student worksheet covering energy flow and trophic relationships
• ✔️ Separate PDF answer key for checking student responses
• ✔️ Student Notes lines for recording key ideas
• ✔️ Teacher Guide with Learning Objectives, Teaching Tips, Discussion Questions, and Common Mistakes

Use this ecosystem energy flow practice for classroom instruction, independent work, review, or formative assessment. The combination of conceptual questions and energy-transfer calculations gives students opportunities to work with both the biological processes and the quantitative relationship described by the 10 percent estimate.

The resource also reinforces an important ecosystem connection: because less energy is available at higher trophic levels, ecosystems generally support less living biomass there. Students can use this relationship to explain why changes in energy availability affect populations and ecosystem productivity.