Waec Model Questions Vol1 2018 Biology Question 4

Practice objective / multiple choice question 4 from the 2018 Waec Model Questions Vol1 Biology examination.

Waec Model Questions Vol1 2018 Biology Objective / Multiple Choice Hard Difficulty
Question 4 WAEC_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • objective

A cactus has a cylindrical stem of radius 5 cm and height 20 cm. Its spines reduce the effective exposed surface area by 30%. Water loss from the stem is proportional to the exposed surface area with a constant k = 0.05 mg·cm⁻²·hr⁻¹. A leaf of the same volume is approximated as a sphere and has no spines. Calculate the hourly water loss from (a) the cactus stem and (b) the leaf, and state which organ loses less water.

Answer Options

A. Cactus ≈ 18 mg\/hr; Leaf ≈ 40 mg\/hr; the cactus loses less water
Correct Answer B. Cactus ≈ 22 mg/hr; Leaf ≈ 33 mg/hr; the cactus loses less water
C. Cactus ≈ 30 mg\/hr; Leaf ≈ 25 mg\/hr; the leaf loses less water
D. Cactus ≈ 25 mg\/hr; Leaf ≈ 20 mg\/hr; the leaf loses less water
Correct Answer
B
Correct Option:
Cactus ≈ 22 mg/hr; Leaf ≈ 33 mg/hr; the cactus loses less water

About This Question

This is Waec Model Questions Vol1 2018 Biology Question 4. It is a objective / multiple choice question from the 2018 Waec Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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