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CAIE IGCSE Biology 3 Movement Into and Out of Cells Questions

Practise comparing diffusion, osmosis and active transport and applying each process to cells, organisms and practical data.

Syllabus
2026–2028
Course
Biology 0610

Covered syllabus points

3.1 Diffusion3.2 Osmosis3.3 Active transport

Question 1

[Maximum number: 1]

Diffusion may be defined as the net movement of particles from a region of their ...... 1……1 \ldots \ldots concentration, to a region of their ...... 2…..2 \ldots . .. contration where movement is 3..... a concentration gradient.

Which words complete gaps 1,2 and 3 ?

1

2

3

higher

lower

down

higher

lower

up

lower

higher

down

lower

higher

up

Question 2

[Maximum number: 1]

Digestive enzymes catalyse the breakdown of large insoluble molecules.

State the name of the substance that is the solvent for most molecules that have been digested by enzymes.

Question 3

[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 4

[Maximum number: 13]

Fig. 1.1 shows the movement of particles through an epithelial cell in the small intestine.

Fig. 1.1

Fig. 1.1

Question (a)

(a)

In Fig. 1.1, arrow P represents the diffusion of oxygen molecules.

[ 3 ]

Question (i)

(i)

Describe what is meant by the term diffusion.

[ 2 ]

Question (ii)

(ii)

State the type of energy needed for diffusion.

[ 1 ]

Question (b)

(b)

Carbon dioxide molecules also move by diffusion.

[ 1 ]

Question (i)

(i)

On Fig. 1.1, draw an arrow to show the direction of diffusion of carbon dioxide molecules.

[ 1 ]

Question (c)

(c)

In Fig. 1.1, arrow Q represents another type of particle movement.

Identify the type of particle movement represented by arrow Q.
Explain your answer.
type of movement
explanation

[ 3 ]

Question (d)

(d)

Fig. 1.2 is a photomicrograph of red onion cells.

Fig. 1.2

Fig. 1.2

Fig. 1.3 is a photomicrograph of the same red onion cells after being immersed in a salt solution.

Fig. 1.3

Fig. 1.3

Using Fig． 1.2 and Fig．1．3，describe and explain the difference in appearance of the cells before and after immersion in salt solution．

[ 6 ]
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