Energy pyramids and matter cycling are the focus of this Grade 7 Science worksheet, which helps students explain why energy flows through ecosystems while matter and nutrients can be reused. Through a reading passage about producers, consumers, trophic levels, and decomposers, students investigate why less usable energy is available higher in a food chain and how nutrients return to the nonliving environment.

Explore Two Different Patterns in Ecosystems

The reading passage follows energy from sunlight to producers such as grasses and algae, then through consumers such as grasshoppers, frogs, and snakes. Students examine how an energy pyramid represents the decrease in usable energy at higher trophic levels as organisms use energy for movement, growth, repair, and other life processes. They also consider why some energy eventually leaves an ecosystem as heat.

Matter follows a different pattern. When organisms produce waste or die, decomposers break down organic material and help return nutrients to soil or water. Plants can absorb these nutrients, allowing matter to move through the ecosystem again. By comparing these processes, students build a clearer explanation of why ecosystems need a continuing energy source even though many nutrients can be recycled.

Reading, Reasoning, and Applying Ecology Concepts

Students work with multiple-choice questions, true-or-false statements, concise written responses, matching pairs, and a fill-in-the-blank passage. An extended-response task asks them to explain the differences between energy transfer and matter cycling, use a food chain or food web example, account for energy loss at higher trophic levels, and describe the role of decomposers.

These activities reinforce important ecology vocabulary, including producers, consumers, trophic levels, energy pyramids, decomposers, nutrients, and food webs. Students practise tracing the direction of energy transfer, explaining why energy is not recycled in the same way as matter, and connecting ecosystem models to biological processes. A Did You Know section provides an additional topic-related learning element.

Included Resources

• Printable Grade 7 Science worksheet with a reading passage and varied comprehension and application tasks.
• Separate PDF answer key for checking responses and reviewing student work.
• Student Notes & Lesson Summary supplement for reinforcing the main ideas about ecosystem energy and nutrient movement.
• Separate PDF Teacher Guide containing learning objectives, teaching tips, discussion questions, and common mistakes.

Make Ecosystem Review More Meaningful

Use this energy flow and nutrient cycling practice during ecology instruction, as independent classwork after introducing food chains, or for review before an assessment. The reading passage establishes the scientific context, while the written explanations give students opportunities to connect several concepts rather than simply recall definitions. The notes supplement supports lesson review, and the teacher guide provides practical preparation and discussion support.

Created for Grade 7 Science in a Texas TEKS context, this resource fits the broader unit titled Energy, Body Systems, Inheritance and Classification. It gives students focused practice with the relationship between energy transfer, trophic levels, decomposition, and matter cycling, helping them explain how these processes contribute to ecosystem function.