Ace the 2026 MTTC Integrated Science (Secondary) Test – Conquer Your Education Quest!

Organ systems are groups of organs that work together to perform essential body functions. In most lists of the 11 organ systems, you’ll see Skeletal, Nervous, and Digestive among them, each defined by its organs and roles. Photosynthesis is a metabolic process by which plants use light energy to make chemical energy, occurring mainly in chloroplasts. It’s a cellular mechanism, not a coordinated system of organs, so it doesn’t count as an organ system. That’s why photosynthesis is not listed, while the Skeletal, Nervous, and Digestive systems are.