Igcse Model Questions Vol1 2023 Biology Question 5

Practice objective / multiple choice question 5 from the 2023 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2023 Biology Objective / Multiple Choice Hard Difficulty
Question 5 IGCSE_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • objective

Two desert plants employ different water‑storage adaptations. Plant A stores water in succulent leaves and has a fresh weight of 150 g and a dry weight of 30 g. Plant B stores water in a deep taproot and has a fresh weight of 200 g and a dry weight of 50 g. (a) Calculate the percentage of water content (by fresh weight) for each plant. (b) The annual rainfall in the region is 100 mm, and each plant occupies a ground area of 0.01 m². Assuming all rainfall is available to the plant, calculate the amount of water (in grams) that falls on each plant per year. (c) Compare the water stored in each plant to the water supplied by rainfall and discuss which adaptation provides a greater advantage under these conditions.

Answer Options

A. Plant A water content = 80 %; Plant B = 75 %; Rainfall per plant = 1000 g; Stored water: 100 g (A), 125 g (B); Adaptation advantage: Plant B provides a larger absolute reserve.
Correct Answer B. Plant A water content = 80 %; Plant B = 75 %; Rainfall per plant = 1000 g; Stored water: 120 g (A), 150 g (B); Adaptation advantage: Plant B provides a larger absolute reserve.
C. Plant A water content = 80 %; Plant B = 75 %; Rainfall per plant = 500 g; Stored water: 120 g (A), 150 g (B); Adaptation advantage: Plant B provides a larger absolute reserve.
D. Plant A water content = 75 %; Plant B = 80 %; Rainfall per plant = 1000 g; Stored water: 120 g (A), 150 g (B); Adaptation advantage: Plant A provides a larger absolute reserve.
Correct Answer
B
Correct Option:
Plant A water content = 80 %; Plant B = 75 %; Rainfall per plant = 1000 g; Stored water: 120 g (A), 150 g (B); Adaptation advantage: Plant B provides a larger absolute reserve.

About This Question

This is Igcse Model Questions Vol1 2023 Biology Question 5. It is one of the objective questions from the 2023 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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