Igcse Model Questions Vol1 2022 Biology Question 4

Practice objective / multiple choice question 4 from the 2022 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2022 Biology Objective / Multiple Choice Medium Difficulty
Question 4 IGCSE_MODEL_QUESTIONS_VOL1 • 2022 • BIOLOGY • objective

A desert reptile excretes uric acid as a paste containing 0.5 g of uric acid per 10 mL of water. A mammal excretes urea containing 0.5 g of urea per 200 mL of water. Both animals must eliminate 30 g of nitrogen (as elemental N). The molecular formulae are C₅H₄N₄O₃ for uric acid (4 N atoms per molecule, molar mass 168 g mol⁻¹) and CH₄N₂O for urea (2 N atoms per molecule, molar mass 60 g mol⁻¹). Which animal uses less water to excrete the same amount of nitrogen, and how much water (in litres) is saved compared with the other animal?

Answer Options

A. The desert reptile uses less water; it saves about 15 L compared with the mammal
Correct Answer B. The desert reptile uses less water; it saves about 24 L compared with the mammal
C. The mammal uses less water; it saves about 5 L compared with the reptile
D. The mammal uses less water; it saves about 12 L compared with the reptile
Correct Answer
B
Correct Option:
The desert reptile uses less water; it saves about 24 L compared with the mammal

About This Question

This is Igcse Model Questions Vol1 2022 Biology Question 4. It is one of the objective questions from the 2022 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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