Neco 2019 Biology Question 3

Practice essay / theory question 3 from the 2019 Neco Biology examination. This question covers nutrition, human digestive system, macronutrient digestion, vitamin deficiency .

Neco 2019 Biology Essay / Theory
Topics: nutrition human digestive system macronutrient digestion vitamin deficiency
Question 3 NECO • 2019 • BIOLOGY • essay
Neco 2019 Biology Question 3 diagram

The diagram shows the major parts of the human digestive system.

Question Parts

( a )
Identify the organ where the majority of carbohydrate digestion occurs and describe the specific enzymes secreted there and their actions.
( b )
A 70‑kg adult consumes a daily diet consisting of 250 g carbohydrates, 80 g protein and 70 g fat.
( ) Calculate the total energy supplied by the diet (use 4 kcal g⁻¹ for carbohydrate and protein, 9 kcal g⁻¹ for fat).
( ) Determine the percentage contribution of each macronutrient to the total energy.
( ) Using the diagram, discuss briefly how the digestive system processes each macronutrient and why a balanced intake is important for health.
( c )
Vitamin B12 deficiency impairs a specific step in the digestive process. Identify that step, explain the physiological consequence, and suggest a dietary strategy to prevent the deficiency, referring to the relevant organ(s) in the diagram.

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About This Question

This is Neco 2019 Biology Question 3. It is one of the essay questions from the 2019 Neco Biology examination.

The question covers nutrition, human digestive system, macronutrient digestion, vitamin deficiency .

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