Trophic energy limits in food webs are the focus of this Grade 7 Science life science worksheet, helping students explain how available energy decreases at each trophic level and why only a fraction is passed to the next level.

Build the Core Concept

Students work with the relationship between trophic levels, energy availability, food-chain length, and biomass. The activities ask learners to explain why energy decreases through a food web, describe why only a fraction of energy becomes available to the next level, and use trophic energy limits to predict patterns in food-chain length and biomass.

What Students Practice

• Explain energy decreases across trophic levels.
• Describe why only a fraction of energy transfers to the next level.
• Predict patterns in food-chain length and biomass.
• Apply ideas through multiple-choice questions, true/false items, short answers, dialogue, matching, a cloze passage, a labeled diagram, a reading passage, and an essay.

Included for Teachers

• Worksheet: Student practice focused on trophic energy limits in food webs.
• Teacher Guide: A separate PDF with learning objectives, teaching tips, discussion questions, and common mistakes.

Classroom Use

Use this resource as Grade 7 life science practice, a lesson activity, review work, or an opportunity for students to demonstrate their understanding of energy movement through food webs. The varied response formats provide several ways for students to work with and communicate their understanding of trophic energy limits.

With the student worksheet and separate teacher guide, this resource gives teachers both classroom-ready practice and supporting guidance for discussing common misconceptions about energy availability between trophic levels.