Waec Model Questions Vol1 2020 Biology Question 3

Practice objective / multiple choice question 3 from the 2020 Waec Model Questions Vol1 Biology examination.

Waec Model Questions Vol1 2020 Biology Objective / Multiple Choice Hard Difficulty
Question 3 WAEC_MODEL_QUESTIONS_VOL1 • 2020 • BIOLOGY • objective

Two rodent species differ in kidney concentrating ability. Species D (desert) can produce urine with an osmolarity up to 3000 mOsm kg⁻¹, whereas species R (rainforest) reaches only 900 mOsm kg⁻¹. Both generate metabolic waste equivalent to 0.5 Osm per day. Assuming they excrete only this waste in urine, calculate (a) the minimum urine volume each must produce per day (in mL), and (b) the percentage reduction in urine volume of the desert species relative to the rainforest species.

Answer Options

A. Desert ≈150 mL; Rainforest ≈500 mL; reduction ≈70 %
B. Desert ≈180 mL; Rainforest ≈540 mL; reduction ≈67 %
C. Desert ≈200 mL; Rainforest ≈600 mL; reduction ≈67 %
Correct Answer D. Desert ≈167 mL; Rainforest ≈556 mL; reduction ≈70 %
Correct Answer
D
Correct Option:
Desert ≈167 mL; Rainforest ≈556 mL; reduction ≈70 %

About This Question

This is Waec Model Questions Vol1 2020 Biology Question 3. It is a objective / multiple choice question from the 2020 Waec Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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