Igcse Model Questions Vol1 2020 Biology Question 3

Practice essay / theory question 3 from the 2020 Igcse Model Questions Vol1 Biology examination. This question covers Nutrition .

Igcse Model Questions Vol1 2020 Biology Essay / Theory
Topic: Nutrition
Question 3 IGCSE_MODEL_QUESTIONS_VOL1 • 2020 • BIOLOGY • essay
Igcse Model Questions Vol1 2020 Biology Question 3 diagram

The diagram shows a labelled food plate that represents a balanced daily diet for a typical adolescent.

Question Parts

( a )
Identify the three macronutrients shown in the diagram and give two food examples for each.
( b )
Explain the principal role of each macronutrient in the human body, citing at least one physiological process for each.
( c )
The plate indicates that 30 % of the total energy should come from proteins, 55 % from carbohydrates and 15 % from fats. An adolescent requires 2 400 kJ of energy per day. Using the energy values protein = 17 kJ g⁻¹, carbohydrate = 17 kJ g⁻¹ and fat = 37 kJ g⁻¹, calculate: i. the amount of energy (in kJ) that should be supplied by each macronutrient; ii. the corresponding mass (in grams) of each macronutrient. Show all steps.
( d )
Discuss two health consequences of a chronic deficiency of each macronutrient.

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About This Question

This is Igcse Model Questions Vol1 2020 Biology Question 3. It is one of the essay questions from the 2020 Igcse Model Questions Vol1 Biology examination.

The question covers Nutrition .

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