Biology

Confusing Photosynthesis and Cellular Respiration

Students treat photosynthesis and cellular respiration as the same process or as exact opposites that happen in the same organisms.

Quick check

Why students make it

Both processes involve glucose, oxygen, carbon dioxide, water, and energy, so the equations look connected. Students often remember only the substances and miss the direction of energy flow and the cell parts involved.

The rule done right

Photosynthesis stores light energy in glucose using CO2\mathrm{CO_2} and H2O\mathrm{H_2O}, mainly in chloroplasts. Cellular respiration releases energy from glucose using O2\mathrm{O_2}, mainly in mitochondria.

Related resources

photosynthesiscellular-respirationenergy-flow