Waec Model Questions Vol1 2021 Biology Question 7

Practice objective / multiple choice question 7 from the 2021 Waec Model Questions Vol1 Biology examination.

Waec Model Questions Vol1 2021 Biology Objective / Multiple Choice Hard Difficulty
Question 7 WAEC_MODEL_QUESTIONS_VOL1 • 2021 • BIOLOGY • objective

Two desert rodent species employ different adaptations to survive prolonged water scarcity. Species A possesses (i) kidneys that produce urine with an osmolarity of 3000 mOsm kg⁻¹, (ii) nocturnal activity, and (iii) large, thin ears that radiate heat. Species B lives in deep burrows, obtains water solely from metabolic oxidation of food, and has a thick, reflective fur coat. Which of the listed adaptations contributes most directly to water conservation, and why?

Answer Options

A. Nocturnal activity in Species A; it reduces water loss by limiting exposure to daytime heat.
Correct Answer B. The production of highly concentrated urine (kidney adaptation) in Species A; it directly minimizes water loss through excretion.
C. Thick, reflective fur coat in Species B; it reflects solar radiation, lowering water loss through sweating.
D. Large, thin ears in Species A; they radiate heat, decreasing the need for evaporative cooling.
Correct Answer
B
Correct Option:
The production of highly concentrated urine (kidney adaptation) in Species A; it directly minimizes water loss through excretion.

About This Question

This is Waec Model Questions Vol1 2021 Biology Question 7. It is one of the objective questions from the 2021 Waec Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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