Igcse Biology

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  • Topic: Heart, Blood, Pulmonary artery
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BIOLOGY

Paper 2 Core

1 hour 15 minutes
No Additional Materials are required.
READ THESE INSTRUCTIONS FIRST
Write in dark blue or black pen.
You may use a pencil for any diagrams or graphs.
Do not use staples, paper clips, highlighters, glue or correction fluid.

Answer all questions.

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Total

This document consists of 14 printed pages and 2 blank pages. IB10 11_0610_21/4RP
© UCLES 2010

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1

(a) Fig. 1.1 shows a mammal.

For
Examiner's
Use

Fig. 1.1
Describe two external features that occur in mammals but do not occur in other vertebrates.
1.

2.
[2]

(b) Fig. 1.2 shows an arthropod.

Fig. 1.2
Describe two external features that occur in all arthropods. 1.

2.
[2]
[Total: 4]

© UCLES 2010

0610/21/O/N/10

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2

Fig. 2.1 shows a population growth graph for a herbivorous insect that has just entered a new habitat.

For
Examiner's
Use

C

number of
insects

B

D

A

time

Fig. 2.1
(a) (i) Which of the four phases, labelled A, B, C and D, represents the stationary phase and which the lag phase?
stationary phase
lag phase

[2]

(ii) During which phases will some of this insect population die? phases

[2]

(b) (i) State two factors that could affect the rate of population growth during phase C. factor 1
factor 2

[2]

(ii) Suggest how these two factors might change. Explain how each change would affect the rate of population growth.
factor 1

factor 2

[4]
[Total: 10]

© UCLES 2010

0610/21/O/N/10

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3

Fig. 3.1 shows a section through the heart.

semilunar
valve

For
Examiner's
Use

B

C

tricuspid
valve
A

D

Fig. 3.1
(a) (i) Name the chamber of the heart labelled D.
[1]
(ii) State which of the chambers, A to D, contain deoxygenated blood. [1]

(b) The pulmonary blood vessels carry blood into and away from the heart. Complete Table 3.1 to give three differences between the pulmonary artery and the pulmonary vein.
Table 3.1
pulmonary artery

pulmonary vein

1
2
3
[3]

© UCLES 2010

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(c) (i) State the function of the valves within the heart.
[1]

For
Examiner's
Use

(ii) Suggest what causes the tricuspid valve to open.

[2]
(iii) Suggest why it is important that when the semilunar valves are open, the tricuspid and bicuspid valves are closed.

[2]
[Total: 10]

© UCLES 2010

0610/21/O/N/10

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4

Fig. 4.1 shows a section through a leaf.

For
Examiner's
Use

Fig. 4.1
(a) On Fig. 4.1, label a stoma, the cuticle and a vascular bundle. Use label lines and the words ‘stoma’, ‘cuticle’ and ‘vascular bundle’ on Fig. 4.1.

[3]

(b) (i) The upper layers of a leaf are transparent. Suggest an advantage to a plant of this feature.

[1]
(ii) The cuticle is made of a waxy material. Suggest an advantage to a plant of this feature.

[1]
(iii) State two functions of vascular bundles in leaves.
1.

2.
[2]

© UCLES 2010

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(c) Most photosynthesis in plants happens in leaves.

For
Examiner's
Use

(i) Name the two raw materials needed for photosynthesis.
1.
2.

[2]

(ii) Photosynthesis produces glucose.
Describe how plants make use of this glucose.

[3]

[Total: 12]

© UCLES 2010

0610/21/O/N/10

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5

(a) (i) In the box, state the word equation for aerobic respiration.

For
Examiner's
Use

[2]
(ii) Complete Table 5.1 to show three differences between aerobic respiration and anaerobic respiration in humans.
Table 5.1
aerobic respiration
in humans

anaerobic respiration
in humans

…………………………………………

…………………………………………

………………………………………….

………………………………………….

…………………………………………

…………………………………………

………………………………………….

………………………………………….

…………………………………………

…………………………………………

………………………………………….

………………………………………….

1

2

3

[3]

© UCLES 2010

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(b) Yeast is used in...
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