Gce Model Questions Vol1 2019 Biology Question 40

Practice objective / multiple choice question 40 from the 2019 Gce Model Questions Vol1 Biology examination.

Gce Model Questions Vol1 2019 Biology Objective / Multiple Choice Medium Difficulty
Question 40 GCE_MODEL_QUESTIONS_VOL1 • 2019 • BIOLOGY • objective

A person normally excretes 1.5 L of urine per day with an average osmolarity of 300 mOsm kg\(^{-1}\). After a night of dehydration, antidiuretic hormone reduces urine volume to 0.5 L while the total amount of solute excreted remains the same. (a) What is the new urine osmolarity? (b) By what percentage has water reabsorption increased compared with the normal state?

Answer Options

Correct Answer A. New osmolarity = 900 mOsm L⁻¹; water reabsorption increased by ≈ 66.7 %.
B. New osmolarity = 600 mOsm L⁻¹; water reabsorption increased by ≈ 33.3 %
C. New osmolarity = 900 mOsm L⁻¹; water reabsorption increased by ≈ 50 %
D. New osmolarity = 1200 mOsm L⁻¹; water reabsorption increased by ≈ 66.7 %
Correct Answer
A
Correct Option:
New osmolarity = 900 mOsm L⁻¹; water reabsorption increased by ≈ 66.7 %.

About This Question

This is Gce Model Questions Vol1 2019 Biology Question 40. It is one of the objective questions from the 2019 Gce Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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