Model Test Paper 2

8/3/2019 Model Test Paper 2

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Index: Name: Class:

MODEL TEST-2011

GRADE 10

Biology 5090/22

Paper 02 September 2011

1 hour 45 minutesMaterials Required: Nil

INSTRUCTIONS TO CANDIDATES

Write your Name, index number and class on all the work you hand in.Write in dark blue or black pen.

You may use a pencil for any diagrams, graphs or rough working.

Do not use staples, paper clips, highlighters, glue or correction fluid.

Section A

Answer all questions.

Write your answers in the spaces provided on the Question Paper.

Section B

Answer all the questions including questions 6, 7

Write your answers in the spaces provided on the Question Paper.

Section C

Answer only one question either 8 or 9.

You are advised to spend no longer than one hour on Section A and no longer

than 45 minutes on Section B and Section C.

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.

This paper consists of 15 printed pages including the cover page.

Muhibbuddin School

S. Hithadhoo, Rep. of Maldives [Turn Over]



For Examiner’s

Use Section A

Answer all the questions in this section.Write your answers in the spaces provided.

1 The fungus Penicillium chrysogenum is grown in a fermenter to produce penicillin. Fig.1.1

shows some of the changes which occur during this process.

Fig.1.1

(a) Explain why the concentration of lactose and ammonia decreases.

Lactose…………………………………………………………………………………………………

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Ammonia……………………………………………………………………………………………….

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[2]

(b) Explain why without a water jacket, the temperature in the fermenter would rise.

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[1]



For Examiner’s

Use

Muhibbuddin School, Model Test 2011, Biology P2, Gr. 10 3 of 15

(c) Use the graph to calculate the maximum rate of penicillin production per hour. Show your

working.

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[2]

(d) Explain why penicillin is usually produced commercially using a batch process, rather than

by a continuous process.

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(e) Explain how X-rays might produce strains of Penicillium chrysogenum which give greater

yields of penicillin.

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[2]

[Total: 9]



For Examiner’s

Use 2 (a) Fig. 2.1 shows a cross-section of the heart at the level of the valves.

Fig.2.1

(i) Complete the following flow chart to show the pathway of blood through the heart.

[2]

(ii) Explain how the valves P and Q ensure one-way flow of blood through the heart.

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[2]



For Examiner’s

Use (b) The cardiac cycle describes the events that occur during one heart beat.

Fig. 2.2 shows the changes in blood pressure that occur within the left atrium, left ventricle

and aorta during one heart beat.

Fig.2.2



For Examiner’s

Use In the table below, match up each event during the cardiac cycle with an appropriate number 1 to 7

on Fig. 2.2.

You should put only one number in each box. You may use each number once, more than once

or not at all.

The first answer has been completed for you.

[4]

(c) Some people are born with structural defects of the heart and its associated blood vessels.

One such condition is called patent ductus arteriosus, where a link between the pulmonary

artery and aorta fails to close after birth.

Suggest and explain how the flow of blood in a person with patent ductus arteriosus differs

from that of a person with a healthy heart.

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[Total: 11]



For Examiner’s

Use 3 In cattle the presence of horn is controlled by a single pair of alleles. Animals with horns have a

homozygous recessive genotype.

Fig.3.1 shows two cows, C1 and C2.

Fig.3.1

A bull is crossed with two cows, C1 and C2.

C1 was without horns and produced a calf which grew horns.

C2 had horns and produced a calf which did not grow horns.

(a) Using the symbol H to represent the dominant allele and h the recessive allele, write down

the following.

The genotype of cow C1………………………………………………………………………….

The genotype of the calf produced by cow C2…………………………………………………

The genotype of the bull………………………………………………………………………….

The phenotype of the bull………………………………………………………………………...

[4]

(b) Draw a fully labeled genetic diagram to show a cross between two cows producing more

number of calves without horns than calves with horns.

[4]

(c) A bull had its horn removed by a farmer to make it less dangerous. In a further cross this bull

was mated with a cow with horns. Describe the appearance of the calves from this cross

and give a reason for your answer.

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[2]

[Total: 10]

C1 C2



For Examiner’s

Use 4 Carbon dioxide and methane are two important greenhouse gases. The effect of human

activities in increasing the concentration of greenhouse gases, such as carbon dioxide and

methane, is known as the enhanced greenhouse effect.

Fig. 4.1 shows the concentrations of carbon dioxide and methane in the atmosphere over the

past 1000 years.

Fig.4.1

(a) Using information in Fig. 4.1, describe the trend in the concentrations of carbon dioxide and

methane over the past 1000 years.

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For Examiner’s

Use


(b) Suggest and explain reasons for the trend in the concentrations of carbon dioxide and

methane that you described in (a).

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(c) Explain how gases, such as those shown in Fig. 4.1, contribute to the greenhouse effect.

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[Total: 10]



For Examiner’s

Use 5 (a) Fig.5.1 shows flowers of two plants A and B belonging to the same species.

Fig.5.1

(i) Using an arrow ( ) show on Fig.5.1 how self-pollination takes place.

[1]

(ii) Using a broken lined arrow ( ) show on Fig.5.1, how cross pollination takes

place.

[1]

Fig.5.2 shows a tranverse section of a flower.

Fig.5.2

A

B

C

X

Y



For Examiner’s

Use


(b) (i) Name the parts lablled A, B and C.

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B…………………………………………………………………………………………………….

C…………………………………………………………………………………………………….

[2]

(ii) State the function of part A.

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[1]

(c) Structures lablled X and Y both contain gametes of this flower.

(i) What type of cell division takes place during the formation of such gametes.

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[1]

(ii) Why should such a type of cell division takes place during the formaton of gametes.

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[1]

(d) Describe what happens to X, inside the flower for it to develop into seeds.

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[3]

[Total: 10]



For Examiner’s

Use


Section B

Answer all the questions

Write your answers in the spaces provided.

6 (a) list the principal sources of, and describe the dietary importance of

(i) carbohydrates,

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(ii) fats,

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(iii)proteins

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[6]

(b) Describe the structure of the villus in relation to its function.

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[4]

[Total: 10]



For Examiner’s

Use


7 (a) Distinguish between the terms, excretion and egesetion.

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(b) Describe how a kidney dialysis machine is use to treat pateints with kidney failure.

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[Total: 10]



For Examiner’s

Use


Section C

Answer only one questions

Write your answers in the spaces provided.

8 (a) Name four structures of a root hair cell and describe how each structure is involved in

carrying out its function.

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[8]

(b) Describe how the absorbed material by root hair cells are used by the plant.

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[2]

[Total: 10]



For Examiner’s

Use 9 (a) Explain how the structure of the leaf is related in carrying out the function of

(i) photosynthesis,

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(ii) gas exchange,

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(iii) transport.

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[6]

(b) Explain why most forms of life are completely dependent on photosynthesis

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Model Test Paper 2