Biology 5090 · O Level · Energy flow

Energy flow — practice question

What is the main source of energy in most biological systems?

  • Abacteria
  • Bphotosynthesis
  • Crespiration
  • Dsunlight

Worked solution & mark scheme

This 1-mark question has a full step-by-step worked solution and mark scheme.

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI