IGCSE Co-ordinated Sciences (9–1) 0973 · Biology · 11

0654.B3.1.01 — Describe diffusion as the net movement of particles from a region of their higher concentration to a region of their lower concentration (i.: past paper questions

6 real questionsasked in 2 of the last 10 exam series2019–2024usually: Name, Describe, Explain, Define

Real questions on 0654.b3.1.01 — describe diffusion as the net movement of particles from a region of their higher concentration to a region of their lower concentration (i.

The newest 6 of 6 written questions. Open one to see it on the real paper.

0973/32 · May/June 2024 · Q12a[1]
A student investigates the motion of smoke particles in air using a microscope. Fig. 12.1 shows the apparatus the student uses. microscope glass box containing smoke particles and air molecules bright light from lamp Fig. 12.1 The student sees the smoke particles moving in random directions. This movement is caused by...
See it on the paper →
0973/31 · October/November 2021 · Q1d[1]
Substances enter and leave cells. Name the process by which substances enter the cells.
See it on the paper →
0973/41 · October/November 2019 · Q11b(i)[2]
Describe the process that causes the effect in Fig. 11.2. Explain this process in terms of movement of molecules. process explanation
See it on the paper →
0973/41 · May/June 2019 · Q7b[2]
Explain why the red dye diffuses into the agar jelly.
See it on the paper →
0973/42 · May/June 2019 · Q10a(i)[1]
Add one arrow to each diagram to show the net movement of carbon dioxide molecules across the cell membrane by diffusion.
See it on the paper →
0973/42 · May/June 2019 · Q10b(i)[2]
Define the term excretion.
See it on the paper →

What examiners said

There were many good answers explaining that the dye particles move from the solution where concentration is highest, down the concentration gradient into the agar cube. The random motion of dye particles was not often cited as the mechanism.
— Examiner report, May/June 2019, 0973/41 Q7(b) (Cambridge)

The stronger candidates were able to draw correct arrows across the cell membrane.
— Examiner report, May/June 2019, 0973/42 Q10(a)(i) (Cambridge)

Candidates need to be able to distinguish between the biological processes of egestion and excretion. The meanings of these terms are both stated in the syllabus and are not interchangeable. Candidates that gained credit generally referred to removal of waste products from the body. Fewer referred to toxic materials, waste products of metabolism or materials in excess.
— Examiner report, May/June 2019, 0973/42 Q10(b)(i) (Cambridge)

Practise this topic

Answer these questions online and get each one marked against the official mark scheme, with what you missed and how to fix it.

Practise these questions

In the syllabus

11 0654.B3.1.01 — Describe diffusion as the net movement of particles from a region of their higher concentration to a region of their lower concentration (i.

Describe diffusion as the net movement of particles from a region of their higher concentration to a region of their lower concentration (i.e. down a concentration gradient), as a result of their random movement
State that some substances move into and out of cells by diffusion through the cell membrane
Describe the importance of diffusion of gases 4 Investigate the factors that influence diffusion, and solutes in living organisms limited to: surface area, temperature, concentration gradient and distance

Past papers, syllabus and examiner reports © UCLES (Cambridge University Press & Assessment). Questions are matched to topics from the official syllabus. AssessPro is independent and not endorsed by Cambridge.