Chapter 2G2 / G3

Sec 3 Combined Science (Biology) Movement of Substances topical questions

12 exam-style questions (53 marks) in three tiers. Try each one on paper first, then check the model answer and mark scheme.

Chapter 2 notes

In this set

Foundation4 Qs · 9 marks
Standard4 Qs · 18 marks
Challenging4 Qs · 26 marks

Every question has a model answer and a mark scheme.

12 questions · 53 marks

Foundation

Recall and simple application

Q1Foundation[2 marks]
Define diffusion.
Q2Foundation[3 marks]
Define osmosis and name the property of the membrane it requires.
Q3Foundation[2 marks]
State one role of diffusion in humans and one role in plants.
Q4Foundation[2 marks]
An animal cell is placed in a concentrated salt solution. State what happens to it and why.

Standard

Structured, exam-style

Q5Standard[5 marks]
Potato strips of equal mass were placed in three solutions for one hour.
Potato strip results
Solution Initial mass / g Final mass / g Percentage change
A: pure water 5.0 5.3 ________
B: dilute sugar 5.0 5.0 ________
C: concentrated sugar 5.0 4.6 ________
Potato strip results
Solution A: pure water B: dilute sugar C: concentrated sugar
Initial mass / g 5.0 5.0 5.0
Final mass / g 5.3 5.0 4.6
Percentage change ________ ________ ________
Q6Standard[4 marks]
Explain why (a) a plant cell in pure water becomes firm, and (b) the same cell does not burst.
Q7Standard[4 marks]
Describe how oxygen reaches a red blood cell in the lungs, naming the process and the gradient that drives it.
Q8Standard[5 marks]
A model tube has a partially permeable membrane separating 2% sugar solution (left) from 8% sugar solution (right). After 30 minutes the right-hand level has risen. (a) Explain the level change. (b) State what has happened to the concentration of the right-hand solution. (c) State one property the membrane must have.

Potato strip results
Solution	Initial mass / g	Final mass / g	Percentage change
A: pure water	5.0	5.3	________
B: dilute sugar	5.0	5.0	________
C: concentrated sugar	5.0	4.6	________

Potato strip results
Solution	A: pure water	B: dilute sugar	C: concentrated sugar
Initial mass / g	5.0	5.0	5.0
Final mass / g	5.3	5.0	4.6
Percentage change	________	________	________

Challenging

Data, evaluation and explanation

Q9Challenging[6 marks]
A student claims: "At equilibrium, the particles stop moving, and osmosis could still occur if the membrane were fully permeable." Identify and correct both errors.
Q10Challenging[7 marks]
Two identical celery stalks are placed: stalk P in water, stalk Q in a strong salt solution. After two hours, P is crisp and Q is floppy. (a) Explain each result using osmosis. (b) Predict and justify the mass change of each stalk. (c) State one control variable the experiment must keep fixed.
Q11Challenging[7 marks]
A dye front spreads 10 cm in 100 s at 20 °C. (a) Calculate the spread rate. (b) At 40 °C the front spreads four times further in the same time; calculate the new rate and the factor increase. (c) Explain the factor increase using particle ideas. (d) State one other change, besides temperature, that would increase the rate.
Q12Challenging[6 marks]
Compare and contrast diffusion and osmosis: (a) state two similarities, (b) state two differences, (c) classify each example — oxygen entering the blood, water entering a raisin — as diffusion or osmosis, with one-word reasons.

Next step

Sit the practice paper

A 30-mark paper set out like a school paper, with a separate mark scheme. Give yourself 40 min.

Question paper

Chapter 2 Practice Paper

30 marks · 40 min · 5 pages

5 multiple-choice questions and structured questions with answer lines. Chapter 2 (diffusion and its roles; osmosis and its effects on plant and animal tissues).

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Mark scheme

PRO

Chapter 2 Practice Paper — mark scheme

Answers · Marking points · 3 pages

Model answers with a mark for each creditworthy point — for marking at home or in class.

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