WAEC Biology 2025 Objective — Question 30
Question 30 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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The instrument is used to measure the
- A. Temperature of water
- B. Turbidity (clarity) of waterCorrect
- C. Salinity of water
- D. pH of water
Explanation
A Secchi disc is lowered into a body of water; the depth at which the disc is no longer visible is recorded as an indicator of water clarity (turbidity).
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