, Cambridge
IGCSE™
● Answer all questions below.
● Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs.
● Write your name, centre number and candidate number in the boxes at the top of the page.
● Write your answer to each question in the space provided.
● Do not use an erasable pen or correction fluid.
● Do not write on any bar codes.
● You may use a calculator when necessary.
● You should show all your working and use appropriate units.
● There are detailed answers at the end of the paper for detailed explanation.
INFORMATION
● The total mark for this paper is 80.
● The number of marks for each question or part question is shown in brackets [ ].
, 2
This document has 20 pages. Any blank pages are indicated.
DC (WW/SG) 341318/4
© UCLES 2025 ,
1 Fig. 1.1 shows the movement of particles through an epithelial cell in the small intestine.
Fig. 1.1
(a) In Fig. 1.1, arrow P represents the diffusion of oxygen molecules.
(i) Describe what is meant by the term diffusion.
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
..................................................................................................................................... [2]
(ii) State the type of energy needed for diffusion.
..................................................................................................................................... [1]
(b) Carbon dioxide molecules also move by diffusion.
(i) State the name of the process in human cells that produces carbon dioxide.
..................................................................................................................................... [1]
© UCLES 2025 0610/42/F/M/25
, 3
(ii) On Fig. 1.1, draw an arrow to show the direction of diffusion of carbon dioxide molecules.
[1]
, ,
(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]
(d) In Fig. 1.1, particle R moves from the lumen of the small intestine into the epithelial cell.
Suggest why particle R cannot be starch.
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
............................................................................................................................................. [2]
© UCLES 2025 0610/42/F/M/25 [Turn over
IGCSE™
● Answer all questions below.
● Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs.
● Write your name, centre number and candidate number in the boxes at the top of the page.
● Write your answer to each question in the space provided.
● Do not use an erasable pen or correction fluid.
● Do not write on any bar codes.
● You may use a calculator when necessary.
● You should show all your working and use appropriate units.
● There are detailed answers at the end of the paper for detailed explanation.
INFORMATION
● The total mark for this paper is 80.
● The number of marks for each question or part question is shown in brackets [ ].
, 2
This document has 20 pages. Any blank pages are indicated.
DC (WW/SG) 341318/4
© UCLES 2025 ,
1 Fig. 1.1 shows the movement of particles through an epithelial cell in the small intestine.
Fig. 1.1
(a) In Fig. 1.1, arrow P represents the diffusion of oxygen molecules.
(i) Describe what is meant by the term diffusion.
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
..................................................................................................................................... [2]
(ii) State the type of energy needed for diffusion.
..................................................................................................................................... [1]
(b) Carbon dioxide molecules also move by diffusion.
(i) State the name of the process in human cells that produces carbon dioxide.
..................................................................................................................................... [1]
© UCLES 2025 0610/42/F/M/25
, 3
(ii) On Fig. 1.1, draw an arrow to show the direction of diffusion of carbon dioxide molecules.
[1]
, ,
(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]
(d) In Fig. 1.1, particle R moves from the lumen of the small intestine into the epithelial cell.
Suggest why particle R cannot be starch.
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
............................................................................................................................................. [2]
© UCLES 2025 0610/42/F/M/25 [Turn over
