Gce Model Questions Vol1 2020 Biology Question 3

Practice essay / theory question 3 from the 2020 Gce Model Questions Vol1 Biology examination. This question covers Nutrition, Digestive system .

Gce Model Questions Vol1 2020 Biology Essay / Theory
Topics: Nutrition Digestive system
Question 3 GCE_MODEL_QUESTIONS_VOL1 • 2020 • BIOLOGY • essay
Gce Model Questions Vol1 2020 Biology Question 3 diagram

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

Question Parts

( a )
Describe the mechanical and chemical processes that occur in the mouth and stomach, and explain how they prepare food for absorption in the small intestine.
( b )
Identify, using the diagram, the region where most nutrient absorption occurs and discuss why its structure is especially suited to this function.
( c )
A dietitian advises a client to increase dietary fibre. Explain, with reference to the diagram, how higher fibre intake would affect the large intestine’s function and overall health.
( d )
The jejunum contains millions of villi that greatly increase its absorptive area.
( ) Calculate the approximate total surface area contributed by the villi, assuming each villus is a cylinder of length 0.5 mm and radius 0.05 mm, and there are about 10⁹ villi.
( ) Discuss how this large surface area benefits nutrient absorption.

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About This Question

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

The question covers Nutrition, Digestive system .

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