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BIOLOGY

1. The document contains an exam question about the human heart and photosynthesis. It includes a diagram of the heart labeling parts P and S, and asking students to shade the ventricle containing oxygenated blood. 2. It also provides a table with data on the rate of photosynthesis in plants at different carbon dioxide concentrations and light intensities. Students are asked to plot the results on a graph. 3. The question examines the effect of carbon dioxide levels on the rate of photosynthesis and how plant leaves are adapted to absorb carbon dioxide from the atmosphere efficiently.

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Diana Nurul
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203 views5 pages

BIOLOGY

1. The document contains an exam question about the human heart and photosynthesis. It includes a diagram of the heart labeling parts P and S, and asking students to shade the ventricle containing oxygenated blood. 2. It also provides a table with data on the rate of photosynthesis in plants at different carbon dioxide concentrations and light intensities. Students are asked to plot the results on a graph. 3. The question examines the effect of carbon dioxide levels on the rate of photosynthesis and how plant leaves are adapted to absorb carbon dioxide from the atmosphere efficiently.

Uploaded by

Diana Nurul
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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SULIT

For examiners
use only

Section A

[60 marks]
Answer all questions in this section.
1

Diagram 1 shows a section through the human heart.

S
R

DIAGRAM 1
1 (a) (i)

(a)

(i) Name the parts labelled P and S.

P :
S :
[2 marks]
1 (a) (ii)
(ii) In Diagram 1, shade the cavity of the ventricle which contains
oxygenated blood.
[1 mark]
1 (a) (iii)

(iii) What is oxygenated blood?


.
..
[1 mark]

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SULIT

3
(b)

Explain why the wall that around the chamber Q is much thicker than that around
chamber R?

For examiners
use only

1 (b)

..
..
[2 marks]
(c)

1 (c) (i)

(i) In Diagram 1, label the bicuspid valve with letter T.


[1 mark]
(ii) Explain the function of bicuspid valve.
.
.

1 (c) (ii)

.
.
[2 marks]
(iii) Why are those valves supported by structure labeled U?
1 (c) (iii)

.
.
[1 mark]
(d)

The coronary arteries supply blood to heart muscle.


(i) Suggest one activity of human which might cause a blood clot in a coronary
artery.

1 (d)

[1 mark]
(ii) Explain what might be the result of such a blockage.

1 (d) (ii)

TOTAL

[2 marks]

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SULIT
For examiners
use only

4
2

An experiment was performed to find out how fast a plant


photosynthesized as the concentration of carbon dioxide in the air around
it was varied. The results are shown in Table 1.
Carbon dioxide
concentration / %

Rate of photosynthesis in arbitrary units


Low light intensity

0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
0.20
2 (a) (i)

0
20
29
35
39
42
45
46
46
46
46

High light intensity


0
33
53
68
79
86
89
90
90
90
90

TABLE 1
(a)

(i) Plot these result on a graph paper provided in page 5.


[3 marks]

2 (a) (ii)

(ii) What is the carbon dioxide concentration of normal air?

[1 mark]

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For examiners
use only

(iii)
Based on the graph that has been plotted, what is the rate of
photosynthesis at this carbon dioxide concentration in a high light
intensity?

2 (a) (iii)

[1 mark]

(b) Market gardeners often add carbon dioxide to the air in greenhouses.
What is the advantage of doing this?
2 (b)

.
.
[2 marks]

2 (c)

(c) Up to what values does carbon dioxide concentration act as a limiting


factor at high light intensities? Explain your answer.
.
.

2 (d)

..
[2 marks]
(d) Explain how leaves are adapted to be efficient at absorbing carbon
dioxide from the atmosphere.
..
.
[2 marks]

TOTAL

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