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CAIE IGCSE Biology 7.3 Physical Digestion Questions

Practise explaining how teeth, stomach churning and bile break food into smaller pieces or droplets without chemical change.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • define physical digestion as size reduction without changing the chemical nature of food molecules
  • link chewing, churning and fat emulsification to increased surface area for digestive enzymes
  • identify tooth types and structures and explain their roles in cutting, tearing, crushing or grinding

Covered syllabus points

7.3.1—Physical digestion as the breakdown7.3.2—Physical digestion increases7.3.3—Types of human teeth7.3.4—Structure of human teeth7.3.5—Functions of the types of human teeth7.3.6—Function of the stomach in physical7.3.7—Bile and fat emulsification

Question 1

[Maximum number: 7]

Question (a)

(a)

Describe what is meant by the term physical digestion.

[ 2 ]

Question (b)

(b)

Explain the role of bile in physical digestion.

[ 3 ]

Question (c)

(c)

Physical digestion also occurs in the mouth.

State the names and functions of two types of human teeth.

[ 2 ]

Question 2

[Maximum number: 1]

The diagram shows the teeth in the lower jaw of a human.
Which tooth is a molar?

Figure for Question 2 — CAIE IGCSE Biology

Question 3

[Maximum number: 2]

Question (a)

(a)

Fig. 1.1 is a side view of a human skull indicating the four types of teeth and the jaws.

Fig. 1.1

Fig. 1.1

[ 2 ]

Question (i)

(i)

State the function of human teeth.

[ 1 ]

Question (ii)

(ii)

State the name of the visible outer layer of the teeth.

[ 1 ]
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