Cambridge Secondary Progression Science Paper 2 Stage 9 2024

Cambridge Secondary Progression Science
Paper 2 Stage 9 2024
2024




45 minutes

No additional materials are needed.


INSTRUCTIONS
• Answer all questions.
• Write your answer to each question in the space provided.
• You should show all your working on the question paper.



INFORMATION
• The total mark for this paper is 50.
• The number of marks for each question or part question is shown in brackets [ ].




3146_02_7RP
© UCLES 2024

, 2

1 Look at the diagram of part of the cross-section of a plant leaf.



upper layer


palisade layer


vein

spongy layer


lower layer


stoma

(a) The palisade layer contains many chloroplasts.

(i) What process happens inside chloroplasts?

[1]

(ii) Name two gases exchanged through the stoma.

1

2
[2]


(b) Chloroplasts contain chlorophyll.

What is the function of chlorophyll?

[1]




© UCLES 2024 S/S9/02

, 3

2 The diagram shows a model of the atomic structure of a sodium atom and a chlorine atom.




Na Cl




A sodium atom and a chlorine atom react together to make a sodium ion, Na+, and a chloride ion,
Cl –.

(a) Describe how a sodium atom and a chlorine atom become charged ions.

sodium atom



chlorine atom



[2]


(b) Describe how ions are held together in an ionic compound.



[2]




© UCLES 2024 S/S9/02 [Turn over