Waec Model Questions Vol1 2024 Biology Question 23

Practice objective / multiple choice question 23 from the 2024 Waec Model Questions Vol1 Biology examination.

Waec Model Questions Vol1 2024 Biology Objective / Multiple Choice Hard Difficulty
Question 23 WAEC_MODEL_QUESTIONS_VOL1 • 2024 • BIOLOGY • objective

Two desert plants employ different adaptations to reduce water loss. Plant A reduces its stomatal density from 300 mm⁻² to 150 mm⁻² (pore area remains 5 µm²). Plant B increases its cuticle thickness from 5 µm to 15 µm. Assume baseline daily transpiration without any adaptation is 10 mL. Stomatal conductance is proportional to stomatal density × pore area, and cuticular water loss is inversely proportional to cuticle thickness. (i) Calculate the daily water loss for each plant after the adaptation. (ii) State which adaptation gives the greater reduction and by how many milliliters per day.

Answer Options

A. Plant B reduces water loss to ≈5.0 mL/day; it saves about 0.5 mL/day more than Plant A.
Correct Answer B. Plant B reduces water loss to ≈3.3 mL/day; it saves about 1.7 mL/day more than Plant A.
C. Plant B reduces water loss to ≈4.0 mL/day; it saves about 1.0 mL/day more than Plant A.
D. Plant B reduces water loss to ≈2.5 mL/day; it saves about 2.5 mL/day more than Plant A.
Correct Answer
B
Correct Option:
Plant B reduces water loss to ≈3.3 mL/day; it saves about 1.7 mL/day more than Plant A.

About This Question

This is Waec Model Questions Vol1 2024 Biology Question 23. It is one of the objective questions from the 2024 Waec Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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