Photosynthesis vs. Cellular Respiration: What's the Difference?
Read the comparison below, or explore it visually. Create a visual lesson comparing photosynthesis and cellular respiration using available credits or plan allowance.
Photosynthesis and cellular respiration are opposite, complementary processes in the cycle of life's energy. Photosynthesis uses sunlight to build sugar and release oxygen (storing energy), while cellular respiration breaks that sugar down using oxygen to release usable energy and carbon dioxide. One charges the battery; the other spends it.
At a glance
| Photosynthesis | Cellular Respiration | |
|---|---|---|
| What it does | Stores energy as sugar (glucose) | Releases energy from sugar |
| Inputs | Sunlight, CO₂, water | Glucose, oxygen |
| Outputs | Glucose, oxygen | Energy (ATP), CO₂, water |
| Where | Chloroplasts (plants, algae) | Mitochondria (almost all cells) |
| Energy flow | Absorbs and stores energy | Liberates and uses energy |
Which should you use?
Photosynthesis happens in plants, algae, and some bacteria — the producers that capture sunlight and turn it into the chemical energy that feeds nearly every food chain.
Cellular respiration happens in virtually all living things, including plants themselves — it's how cells actually spend stored energy to grow, move, and function.