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CAIE A-Level Biology AS 4.2 Movement Into and Out of Cells Questions

Practise CAIE AS Biology 4.2 by explaining transport across membranes, interpreting diffusion and osmosis investigations, and using SA:V and water-potential evidence.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • Differentiate diffusion, facilitated diffusion, osmosis, active transport, endocytosis and exocytosis by route and energy.
  • Interpret diffusion and osmosis experiments in plant tissue, Visking tubing and agar using gradients and controls.
  • Calculate SA:V ratios for 3D shapes and explain how increasing size reduces exchange efficiency.
  • Use agar-block diffusion results to relate block dimensions and SA:V to penetration time.
  • Estimate plant-tissue water potential from percentage-mass-change graphs or the zero-change point.
  • Predict water movement along water-potential gradients and compare plant-cell turgor or plasmolysis with animal-cell swelling or lysis.

Covered syllabus points

4.2.1—Membrane transport processes4.2.2—Diffusion and osmosis investigations4.2.3—Surface area to volume ratios4.2.4—SA:V ratio investigation4.2.5—Water potential investigation4.2.6—Water movement between cells

Question 1

[Maximum number: 1]

The statements describe some events in the process of exocytosis of glycoprotein molecules.
1 Membrane of the Golgi body folds around glycoprotein molecules.
2 Vesicle binds to and fuses with the cell surface membrane.
3 Vesicle attached to microtubules moves through the cytoplasm.
4 Secretory vesicle forms.
What is the correct order of events for exocytosis?

A

1→4→2→31 \rightarrow 4 \rightarrow 2 \rightarrow 3

B

1→4→3→21 \rightarrow 4 \rightarrow 3 \rightarrow 2

C

2→3→1→42 \rightarrow 3 \rightarrow 1 \rightarrow 4

D

4→1→3→24 \rightarrow 1 \rightarrow 3 \rightarrow 2

Question 2

[Maximum number: 1]

Visking tubing is often used as a model during experiments to investigate osmosis in plants.
What could Visking tubing be used to represent?

cell surface membrane

cell wall

tonoplast

key

✓ = represents

x = does not represent

✓

✓

✓

✓

x

✓

✓

x

x

χ\boldsymbol{\chi}

✓

✓

Question 3

[Maximum number: 1]

A student was asked to calculate the surface area: volume ratio for an agar cube with a side length of 5.5 mm .

Which surface area: volume ratio is correct?

A

0.2: 1

B

0.9: 1

C

1.0:1

D

1.1:1

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