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CAIE IGCSE Biology 3.3 Active Transport Questions

Practise recognising active transport from movement against a concentration gradient, then explain the roles of membrane carriers and energy released by respiration.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • Recognise active transport as movement across a membrane from lower to higher concentration, against the gradient, using energy released by respiration.
  • Apply active transport to mineral-ion uptake by root hairs and glucose uptake by epithelial cells, including the respiration and oxygen needed.
  • Explain how membrane carrier proteins move ions or molecules during active transport and use gradient, carrier and energy evidence to justify the process.

Covered syllabus points

3.3.1—Active transport as the movement3.3.2—Importance of active transport3.3.3—Protein carriers move molecules or

Question 1

[Maximum number: 1]

A student made the following statements about the movement of ions by active transport.
1 It is the net movement of particles from a low concentration to a high concentration.
2 It is the net movement of particles from a high concentration to a low concentration.
3 It requires the use of energy from respiration.
4 It can only take place in living cells.
Which statements are correct?

A

1, 3 and 4

B

1 and 4 only

C

2 and 4

D

2 only

Question 2

[Maximum number: 7]

Question (a)

(a)

The movement of molecules within an organism can occur by diffusion and active transport.
Complete Table 1.1 by placing ticks (✓)(\checkmark) to show the correct features of each process.

Table 1.1

Table 1.1

[ 4 ]

Question (b)

(b)

Explain why active transport is important in root hair cells.

[ 3 ]

Question 3

[Maximum number: 2]

Fig. 3.1 is a diagram of the junction between two neurones in a healthy person.
Fig. 3.2 is a diagram of the junction between the same two neurones in a person who has Parkinson's disease. This disease affects the nervous system.

Fig. 3.1

Fig. 3.1

Fig. 3.2

Fig. 3.2

Cell membranes also contain protein carriers. Describe the role of protein carriers.

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