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Course: Edexcel A Level Biology A (SNAB) 9BI0
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Edexcel A Level Biology A (SNAB) 9BI0

Topic 1 · Lifestyle, Health and Risk

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Topic 2 · Genes and Health

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Topic 3 · Voice of the Genome

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Topic 4 · Biodiversity and Natural Resources

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Topic 5 · On the Wild Side

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Topic 6 · Immunity, Infection and Forensics

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Topic 7 · Run for your Life

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Topic 8 · Grey Matter

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Quiz

1.1.2 The Importance of Water in Transport – Exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.

Which property of water makes it a good transport medium in blood plasma?

It is a solvent for many substances
It is less dense than air
It has a low boiling point
It is non-polar
2.
Which tissue transports water?
Xylem
Cambium
Phloem
Epidermis
3.
Why is water a good transport medium?
It is non-polar
It has a low specific heat capacity
It is a polar solvent
It is less dense as a liquid
4.
Water moves from:
−200 kPa to −600 kPa
−600 kPa to −200 kPa
−400 kPa to 0 kPa
−500 kPa to −100 kPa
5.
Which key term matches this description: "Breaking bonds by adding water."
Which key term matches this description: "Breaking bonds by adding water."
Hydrolysis
Peptide bond
Ester bond
Hydrogen bond
6.
Which key term matches this description: "Diffusion of water across a membrane."
Which key term matches this description: "Diffusion of water across a membrane."
Plasma membrane
Osmosis
Hypotonic
Active transport
7.
Using the transpiration table, why is water loss lowest in humid air?
Stomata are forced fully open
Humid air is colder
The water potential gradient between leaf and air is small
Xylem stops working
8.
Stomata counts on leaf surfaces are shown. Which leaf surface loses most water, if other factors are equal?
Upper surface of leaf A
Upper surface of leaf B
Lower surface of leaf A
Lower surface of leaf B
9.
A potometer bubble moved 45 mm in 15 minutes. What is the rate of water uptake?
45 mm per minute
0.33 mm per minute
3 mm per minute
60 mm per minute
10.
The graph shows water uptake over a day. Why is it highest around midday?
Dr Dabour Hub Academy - figure 1
Stomata are open and warmth increases evaporation
Stomata are closed at midday
Phloem is fastest at noon
Roots stop working at night only
11.
Why must the shoot be cut and fitted to the potometer under water?
To wash the leaves
To add sugar
To kill the shoot
To stop air entering the xylem and breaking the water column
12.
Why does a potometer measure water uptake rather than exact transpiration?
Some absorbed water is used in photosynthesis or kept in cells
All water is used in the phloem
Potometers measure sugar
Transpiration uses no water
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Part of Topic 1 · Lifestyle, Health and Risk — see every lesson and quiz in this unit.
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