Photosynthesis and cellular respiration energy transformations are the focus of this Grade 7 science worksheet, connecting light energy, chemical bonds, ATP, matter, and cellular activity within the NGSS-aligned topic From Molecules to Organisms: Structures and Processes.

From Light Energy to ATP

Students examine how chloroplasts use light energy to help make sugar from carbon dioxide and water, how energy becomes stored in sugar's chemical bonds, and how mitochondria help transfer energy from sugar into ATP for cellular work. The resource also connects the two processes through the reuse of carbon dioxide, water, sugar, and oxygen.

Questions address the role of light level in photosynthesis and why active tissues generally use more ATP than resting tissues. Students encounter multiple-choice questions, true/false statements, short-answer responses, a labeled diagram, a categorization task, and a short note, giving teachers several ways to check understanding of the same core concepts.

What Teachers Receive

• ✅ Student worksheet covering energy transformations in photosynthesis and cellular respiration
• ✅ Separate PDF answer key for checking student responses
• ✅ Student Notes lines at the bottom of the worksheet
• ✅ Teacher Guide within the Answer Key PDF
• ✅ Learning Objectives, Teaching Tips, Discussion Questions, and Common Mistakes in the Teacher Guide

Classroom Use

Use this resource for Grade 7 science instruction, guided practice, independent work, review, or a formative assessment of photosynthesis and cellular respiration. The reading passage establishes the scientific relationships before students apply the ideas through questions and activities.

The short-answer prompts ask students to explain how photosynthesis and cellular respiration are connected through matter, how photosynthesis transforms light energy, and why active tissue may require more ATP. These tasks provide opportunities to check whether students can explain the energy and matter relationships rather than simply recall terminology.

Built Around Key Biology Concepts

This worksheet reinforces the movement and transformation of energy from sunlight to chemical energy in sugar and then to usable energy in ATP. It also addresses limiting factors in photosynthesis by considering how increasing light may affect the rate of photosynthesis until another factor becomes limiting.

With an included answer key and teacher guidance, the resource gives teachers ready-to-use support for teaching and reviewing energy transformations in photosynthesis and cellular respiration.