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Course: AQA A Level Biology 7402
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Curriculum

AQA A Level Biology 7402

1. Biological Molecules

0/102

2. Cell Structure

0/95

3. Exchange and Transport

0/98

4. Genetics, Variation and Interdependence

0/94

5. Energy Transfers In and Between Organisms (A Level only)

0/63

6. Organisms Respond to Changes in their Environments (A Level only)

0/93

7. Genetics, Populations, Evolution and Ecosystems (A Level only)

0/55

8. The Control of Gene Expression (A Level only)

0/72

9. Exam Guidance and Skills

0/38
Quiz

3.4.1 Mass Transport – Exam questions

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  • Questions count: 7
  • Passing grade: B+
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1.
Mass of a potted plant was recorded under different conditions. Under which condition was transpiration fastest?
Still and cool
Still and warm
Windy and warm
Humid and still
2.
Leaves coated with petroleum jelly on the lower surface lose far less mass than uncoated ones. What does this show?
Upper surfaces have most stomata
Most water is lost through stomata on the lower surface
Jelly adds mass
Water leaves through roots
3.
Using the table, what is the percentage change in mass at 0.0 mol/dm³?
+30%
−15%
+15%
+2.3%
4.
Why do the potato cylinders at 0.8 mol/dm³ lose mass?
Sucrose enters and dissolves the potato
The solution is hypotonic
Active transport pumps water out
The solution is hypertonic, so water leaves the cells by osmosis
5.
Why is percentage change in mass used instead of change in grams?
It gives larger numbers
It removes the need for a balance
It measures sucrose directly
Cylinders may start with different masses, so percentages allow fair comparison
6.
Cylinders in 0.0 mol/dm³ gained mass but then stopped gaining after 12 h. Why?
Cell walls resist further expansion as cells become fully turgid
Water stopped moving by diffusion forever
The cells burst
Sucrose entered
7.
Potato cylinders gain mass in a sucrose solution. What does this show?
The solution has a higher water potential than the cells
Sucrose entered the cells
The cells are dead
The solution is more concentrated than the cells
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Part of 3. Exchange and Transport — see every lesson and quiz in this unit.
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