Biology (New syllabus)

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A1.1 Water

Question 1

SL & HLPaper 1

The diagram shows a pond with floating ice on the surface. How does the low density of ice benefit aquatic life in cold climates?

Question 2

SL & HLPaper 1

The image shows water droplets on a leaf. What property of water is being demostrated here?

Question 3

SL & HLPaper 1

The diagram shows ice floating on water. Why does ice float?

Question 4

SL & HLPaper 1

Which property of water contributes to its ability to moderate temperature in organisms?

Question 5

SL & HLPaper 2

1.

Explain how cohesion arises in water molecules at a molecular level.

[3]

Question 6

SL & HLPaper 2

1.

Explain how cohesion and adhesion enable the transport of water from roots to leaves.

[8]

Question 7

SL & HLPaper 1

Which property of water allows it to act as a solvent in biological systems?

Question 8

SL & HLPaper 2

Compare and contrast the thermal properties of water with those of methane, explaining why water is more suitable as a medium for life.

1.

Compare and contrast the thermal properties of water with those of methane.

[6]

2.

Explain why water is more suitable as a medium for life than methane.

[4]

Question 9

SL & HLPaper 2

1.

Describe how water's ability to buffer changes in pH makes it essential for living organisms.

[8]

Question 10

SL & HLPaper 2

1.

Explain how the high latent heat of vaporization of water benefits organisms in maintaining their body temperature.

[8]