Photosynthesis and cellular respiration connect the movement of energy with the cycling of matter. This Grade 10 Science worksheet compares how these two metabolic processes use and release substances, transfer energy, and contribute to the carbon cycle. Students examine not only how their reactants and products are related, but also why the processes involve different pathways rather than simply being identical reactions running backward.

Trace the substances and energy through both processes

The reading passage explains how plants, algae, and some bacteria use light energy to convert carbon dioxide and water into organic compounds such as glucose, releasing oxygen. It then follows the role of aerobic cellular respiration: cells use organic compounds and oxygen to transfer usable energy to ATP, releasing carbon dioxide and water. Students also consider why some energy dissipates as heat rather than being transferred to ATP.

A key comparison is the relationship between the two processes. Photosynthesis stores captured light energy in the chemical bonds of organic molecules, while cellular respiration makes energy from those compounds available for cellular activities. The resource clarifies that plants carry out both processes, and that cellular respiration occurs in cells across many kinds of organisms, not only animals.

Build a connected picture of metabolism

Students work with the main reactants and products of each process, the role of ATP, and the movement of carbon between the environment and living things. They consider how photosynthesis takes carbon dioxide into organic compounds and how respiration returns carbon dioxide to the environment. This makes the comparison more than a pair of equations: students must explain how matter cycles while energy enters ecosystems as sunlight and eventually dissipates as heat.

The worksheet includes multiple-choice questions, true-or-false statements, short responses, a matching activity, a cloze exercise, an extended-response comparison, and a Did You Know section. The written tasks ask students to explain why plants need respiration, compare the substances involved in both processes, and describe their roles in the carbon cycle.

Included teaching and review materials

• Student worksheet: Reading and practice on photosynthesis, aerobic cellular respiration, energy transfer, ATP, and carbon cycling.
• Separate answer key PDF: Supports checking student responses and reviewing the comparison.
• Student Notes & Lesson Summary: A supplementary resource for revisiting the key concepts.
• Separate Teacher Guide PDF: Includes Learning Objectives, Teaching Tips, Discussion Questions, and Common Mistakes.

Ways to use the resource

Use this photosynthesis and cellular respiration comparison worksheet after introducing the two processes, as guided independent practice, or as a review before an assessment. The cloze exercise reinforces the vocabulary and relationships, while the extended response gives students an opportunity to bring together reactants, products, energy changes, and carbon cycling in one explanation. The notes, answer key, and teacher guide provide distinct support for student review, response checking, and lesson preparation.

The resource is identified with TEKS §112.34(b)(7)(A) and is designed for Grade 10 Science study of metabolism and energy processes.