Prac_exam_style_paper_3.pdf

Candidate name Centre number

BIOLOGY Practice exam-style Paper 3

Candidate number

0610/3 1 hour 15 minutes

Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand in. 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. DO NOT WRITE IN ANY OF THE BARCODES. Answer all questions. Electronic calculators may be used. You may lose marks if you do not show your working or if you do not use appropriate units. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question.

0610/3 Practice exam-style Paper

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Practice exam-style Paper 3

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1 a

Fig. 1.1 shows a motor neurone, which is a specialised type of animal cell. B C

D

A

E

Fig. 1.1

i

Name the structures A to E. A B C D E

[5]

ii Give the letters of two structures that you would expect to find in all animal cells. [2] iii Name two structures that are found in plant cells, but are not present in the cell in Fig. 1.1. 1 b

i

2

[2]

On Fig. 1.1, draw one arrow to show the direction in which a nerve impulse travels in this neurone.

[1]

ii The neurone shown in Fig. 1.1 is part of a reflex arc. Describe the role of this neurone in the reflex arc.

[3]

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Practice exam-style Paper 3

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iii The transmission of a nerve impulse requires energy. Outline how energy is released in a cell, so that the cell can use it.

[3]

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Practice exam-style Paper 3

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2 Fig. 2.1 shows some wind-pollinated flowers.

Fig. 2.1

a

Describe three visible features of these flowers that indicate that they are pollinated by wind, and not by insects. 1

2

3 [3] b

Suggest how the pollen produced by these flowers would differ from the pollen produced by insect-pollinated flowers.

[2]

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Practice exam-style Paper 3

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c

In one species of plant, the flowers may have either green or brown stamens. This is controlled by a gene with two alleles. Allele G codes for green stamens, and allele g codes for brown stamens. When a homozygous plant with green stamens is crossed with a homozygous plant with brown stamens, all the resulting plants are heterozygous and have green stamens. i

State the genotype of a homozygous plant with brown stamens. [1]

ii Which allele, G or g, is recessive? Explain your answer. recessive allele explanation [2] iii Draw a complete genetic diagram, including a Punnett square, to predict and explain the results of a cross between two heterozygous plants with green stamens.

[5]

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Practice exam-style Paper 3

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3 Table 3.1 shows the volume and composition of the urine produced by a boy on two consecutive days. Table 3.1

feature of urine

day 1

day 2

volume of urine / dm3

1.2

1.5

urea / percentage

2.0

1.9

salt / percentage

0.4

0.3

a

i

Compare the urine produced on Day 2 with that produced on Day 1.

[3] ii Suggest two reasons for the differences in the volume and composition of urine produced on these two days. 1

2 [2] b

The urea in urine is being excreted. i

Define the term excretion.

[2] ii Name the organ in which urea is produced. [1] iii Name the substances from which urea is formed. [1] iv Describe how urea is transported from where it is formed to the kidneys.

[2] © Cambridge University Press 2014 IGCSE Biology

Practice exam-style Paper 3

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4 Fig. 4.1 shows a section through a human heart and the blood vessels entering and leaving it.

pulmonary artery G pulmonary vein A

right atrium F

wall of left ventricle B vena cava E septum C right ventricle D

Fig. 4.1

a

Give the letter of the part that matches each description. i

b

receives blood from the parts of the body other than the lungs

[1]

ii one part that contains oxygenated blood

[1]

iii separates oxygenated blood from deoxygenated blood

[1]

iv contains muscles that contract to push blood into the aorta

[1]

v

[1]

transports blood to the lungs

The muscular wall of the heart is supplied with oxygen by the coronary arteries. i

Describe what may happen if the coronary arteries become blocked.

[3] ii State four factors, other than gender and age, that increase the risk of a blockage occurring in the coronary arteries. 1 2 3 4

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[2]

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c

Fig. 4.2 shows the numbers of men and women of different ages, living in the USA, who developed cardiovascular disease. Cardiovascular disease is caused by damage to the heart or blood vessels. The figures are the number of people in every thousand who developed the disease. 80 74.4 70

65.2 59.2

60 50

40.2

number of people 40 per thousand developing CVD 30

Men

34.6

21.4

20.0

20 10.1

10

75-84

85-94

75-84

85-94

Women

8.9 4.2

0 0

45-54

55-64

65-74 age / years

Fig. 4.2

i

With reference to Fig. 4.2, describe how a man’s risk of developing cardiovascular disease changes with age.

[3] ii Compare the risk for a woman of developing cardiovascular disease with that for a man.

[2]

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Practice exam-style Paper 3

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5 a

i

Write the word equation for photosynthesis. [2]

ii Explain the importance of photosynthesis in food webs.

[3] b

Leaves need water in order to carry out photosynthesis. Fig. 5.1 shows a root hair cell, which absorbs water from the soil.

Fig. 5.1

i

Describe how the root hair cell absorbs water by osmosis.

[3] ii Water is transported from the roots to the leaves through tubes made of dead cells. Name these dead cells

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[1]

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c

Water is lost from leaves by transpiration. Table 5.1 shows the volume of water that was lost from a plant each hour, between 3 pm and 3 am. Table 5.1

time of day water loss / cm3 per hour

i

3 pm 4 pm 15

15

5 pm

6 pm

7 pm

8 pm

9 pm

13

10

7

7

5

10 pm 11 pm 12 pm 1 am 2

2

1

1

Calculate the total volume of water lost from the plant during the 10-hour period. cm3

[1]

ii Describe how the rate at which water was lost from the plant changed during this 10-hour period.

[2] iii Suggest an explanation for the changes you have described in ii.

[2]

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6 a

Selective breeding has been used for thousands of years. For example, selective breeding has developed varieties of rice that produce more grains than wild varieties of rice. i

Describe how this selective breeding could be carried out.

[3] ii Rice has been genetically engineered to produce grains containing large amounts of vitamin A. This rice is called Golden Rice. Explain the difference between genetic engineering and selective breeding.

[3] b

Rice contains large amounts of starch. In the human digestive system, starch molecules are broken down by enzymes to produce glucose. Glucose is then absorbed into the blood. i

Name one part of the digestive system in which starch is broken down by enzymes. [1]

ii Name the part of the digestive system in which glucose is absorbed into the blood. [1] c

If cooked rice is left uncovered at room temperature for a long period of time, eating the rice can cause food poisoning. Explain why this is less likely to happen if the rice is kept in a fridge.

[3]

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Practice exam-style Paper 3

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