🧬 FORM 4 BIOLOGY CHAPTER 3 — ESSAY CHALLENGE
📚 20 MARKS
Answer ALL questions.
(a) Explain how the structure of a plasma membrane allows substances to move across it by simple diffusion.
[5 marks]
(b) Explain the process of osmosis and describe what happens to a plant cell when it is placed in:
(i) a hypotonic solution
(ii) a hypertonic solution
[7 marks]
(c) A student places potato strips in solutions of different concentrations.
Explain how the student can determine the concentration of solution that is isotonic to the potato cells. Include the expected observation and conclusion.
[8 marks]
🎯 TOTAL: 20 MARKS
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1September 5, 2026 1.5K 5 12
