AS
BIOLOGY
Paper 2
Thursday 23 May 2024 Morning Time allowed: 1 hour 30 minutes
For Examiner’s Use
Question Mark
1
2
3
4
5
6
7
8
9
TOTAL
7401/2
, 2
Answer all questions in the spaces provided.
0 1 . 1 Water has a high heat capacity and a large latent heat of vaporisation.
Describe the importance of each of these properties to living organisms.
[2 marks]
High heat capacity
Large latent heat of vaporisation
0 1 . 2 Figure 1 shows that water loss from a porous pot can cause the upward movement of
water.
Figure 1
*02*
, 3
Do not write
outside the
Biologists have concluded that the experiment in Figure 1 supports the box
cohesion–tension theory of water transport in the xylem.
Explain how this conclusion is supported by the experiment in Figure 1.
[3 marks]
0 1 . 3 An air bubble was introduced into the glass tubing in Figure 1. The air bubble moved
a distance (d) of 1.5 cm in 120 minutes. The radius of the lumen (hole) of the glass
tubing was 0.6 cm
Use this information and the formula πr 2 d to calculate the rate of water movement in
the glass tubing in cm3 hour –1.
Use π = 3.14 in your calculation.
[1 mark]
Answer cm3 hour –1 6
Turn over ►
*03*
IB/M/Jun24/7401/2
, 4
Do not write
outside the
0 2 . 1 Figure 2 shows an image of a red blood cell at a magnification of × 5500 box
Figure 2
Calculate the actual diameter in μm of the red blood cell between points P and Q.
Show your working.
[2 marks]
Answer μm
*04*
IB/M/Jun24/7401/2
BIOLOGY
Paper 2
Thursday 23 May 2024 Morning Time allowed: 1 hour 30 minutes
For Examiner’s Use
Question Mark
1
2
3
4
5
6
7
8
9
TOTAL
7401/2
, 2
Answer all questions in the spaces provided.
0 1 . 1 Water has a high heat capacity and a large latent heat of vaporisation.
Describe the importance of each of these properties to living organisms.
[2 marks]
High heat capacity
Large latent heat of vaporisation
0 1 . 2 Figure 1 shows that water loss from a porous pot can cause the upward movement of
water.
Figure 1
*02*
, 3
Do not write
outside the
Biologists have concluded that the experiment in Figure 1 supports the box
cohesion–tension theory of water transport in the xylem.
Explain how this conclusion is supported by the experiment in Figure 1.
[3 marks]
0 1 . 3 An air bubble was introduced into the glass tubing in Figure 1. The air bubble moved
a distance (d) of 1.5 cm in 120 minutes. The radius of the lumen (hole) of the glass
tubing was 0.6 cm
Use this information and the formula πr 2 d to calculate the rate of water movement in
the glass tubing in cm3 hour –1.
Use π = 3.14 in your calculation.
[1 mark]
Answer cm3 hour –1 6
Turn over ►
*03*
IB/M/Jun24/7401/2
, 4
Do not write
outside the
0 2 . 1 Figure 2 shows an image of a red blood cell at a magnification of × 5500 box
Figure 2
Calculate the actual diameter in μm of the red blood cell between points P and Q.
Show your working.
[2 marks]
Answer μm
*04*
IB/M/Jun24/7401/2
