Igcse Model Questions Vol1 2023 Biology Question 6

Practice essay / theory question 6 from the 2023 Igcse Model Questions Vol1 Biology examination. This question covers Excretion .

Igcse Model Questions Vol1 2023 Biology Essay / Theory

Topic: Excretion

Question 6 IGCSE_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • essay

Excretion removes metabolic waste products from the body and helps maintain internal balance.

Question Parts

( a )

Describe the structure of a human nephron and state the function of each main part in the formation of urine.

( b )

Explain how the kidney conserves water when a person is dehydrated, referring to the hormonal control involved.

( c )

A healthy adult produces 150 mL of urine per hour with an average urea concentration of 0.25 g per 100 mL. Calculate the total amount of urea excreted in 24 hours. If the same person becomes dehydrated and urine volume falls to 80 mL per hour while the urea concentration rises to 0.40 g per 100 mL, calculate the new total urea excreted in 24 hours and discuss the physiological significance of this change.

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About This Question

This is Igcse Model Questions Vol1 2023 Biology Question 6. It is one of the essay questions from the 2023 Igcse Model Questions Vol1 Biology examination.

The question covers Excretion .

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