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

Difficulty level: Hard .

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