Biology 5090 · O Level · Diffusion and osmosis

Diffusion and osmosis — practice question

Contact lenses are worn on the surface of the eye to correct vision defects. One kind of contact lens is partially permeable and is usually kept in a sterile sodium chloride solution. The sodium chloride solution has the same concentration as the fluid covering the surface of the eye. A person accidentally stores their contact lenses in distilled water instead of sodium chloride solution. They then put a contact lens onto the surface of their eye. Which pair of statements describes what happens next?

  • A1 and 3
  • B1 and 4
  • C2 and 3
  • D2 and 4

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