Biology 9700 · AS & A Level · The gas exchange system

The gas exchange system — practice question

What role do cilia play in the gas exchange system?

  • Ato increase the surface area
  • Bto move mucus
  • Cto produce mucus
  • Dto trap dust and pathogens

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