WAEC Biology 2025 Objective — Question 7
Question 7 of 50 from the West African Examinations Council (WAEC) Biology 2025 Objective paper, with the correct answer and a full explanation.
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Four cells each with osmotic potential of about 3% salt solution were immersed respectively into solutions of different concentrations as follows: I - 1% salt solution, II - 3% salt solution, III - 6% salt solution, IV - 10% salt solution. Which of the solutions would cause an increase in osmotic pressure within the cell?
- A. ICorrect
- B. II
- C. III
- D. IV
Explanation
Osmotic pressure increases when water moves into the cell due to the concentration gradient of solutes. Solution I (1%) is hypotonic relative to the cell's internal solution (3%), so water moves into the cell, increasing osmotic pressure.
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