COMBINED SCIENCE 0653/22 45 minutes - CIE Notes

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Cambridge International Examinations Cambridge International General Certificate of Secondary Education

COMBINED SCIENCE Paper 2 Multiple Choice (Extended)

Additional Materials:

Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended)

0653/22 February/March 2018

45 minutes

READ THESE INSTRUCTIONS FIRST

Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, Centre number and candidate number on the Answer Sheet in the spaces provided unless this has been done for you. DO NOT WRITE IN ANY BARCODES.

There are forty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet.

Read the instructions on the Answer Sheet very carefully.

Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. A copy of the Periodic Table is printed on page 16. Electronic calculators may be used.

IB18 03_0653_22/2RP ? UCLES 2018

This document consists of 15 printed pages and 1 blank page.

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1 Which is a characteristic of all living organisms? A breathing B eating C egestion D movement

2 The diagram shows a typical animal cell. X

Y Z

What are the functions of structures X, Y and Z?

X

A

traps light

B

traps light

C

contains

genetic material

D

contains

genetic material

Y

contains genetic material

site of chemical reactions

site of chemical reactions

controls entry and exit of materials

Z controls entry and exit of materials provides support

controls entry and exit of materials provides support

3 The statements explain the activity of a human enzyme as the temperature increases from 20 ?C to 50 ?C. The statements are in the wrong order.

1 The enzyme is working at its optimum rate. 2 The kinetic energy of the enzyme molecules begins to increase. 3 The enzyme begins to change shape. 4 The enzyme is completely denatured.

What is the correct order of the statements? A 1324 B 1432 C 2134 D 3241

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3 4 Tests were performed on four samples of food. The results are shown in the table.

Which food contains protein only?

results of food tests

Benedict's test biuret test

iodine test

A

blue

B

blue

C

red

D

red

blue purple blue purple

blue/black brown

blue/black brown

5 A student is investigating how light affects photosynthesis.

gas

measuring cylinder

beaker

water

glass funnel

aquatic plant

X

Y

The student shines a light from point Y and measures the volume of gas produced in five minutes.

Which gas is produced and how does the rate of gas production change when the light is moved from Y to X?

gas produced

A carbon dioxide

B carbon dioxide

C

oxygen

D

oxygen

rate of gas production

decreases increases decreases increases

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4 6 The diagram shows the alimentary canal.

Which label shows where bile is stored?

A B C D

7 The graph shows the rate of water loss from a plant during daylight hours. X

rate of water loss / g per hour

Y

0

0

time / hours

What could cause the change in the rate of water loss between point X and point Y? A The air becomes cooler. B The air becomes drier. C The day becomes sunnier. D The stomata open wider.

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5 8 What are possible causes of coronary heart disease?

exercise

A

B

C

D

smoking

stress

9 During aerobic respiration of glucose, oxygen is used up and water is produced.

How many molecules of oxygen are used and how many molecules of water are produced when one molecule of glucose is respired?

number of molecules of oxygen used

number of molecules of water produced

A

1

1

B

1

6

C

6

1

D

6

6

10 Light shines on a shoot tip from the direction shown.

light XY

After three days the shoot tip has bent towards the light. What is the reason for this change? A Auxin moves away from the light causing cell elongation in area Y. B Auxin moves away from the light preventing cell elongation in area Y. C Auxin moves towards the light causing cell elongation in area X. D Auxin moves towards the light preventing cell elongation in area X.

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6 11 How do male gametes compare with female gametes?

size

A

larger

B

larger

C

smaller

D

smaller

move independently

12 The diagram shows part of the carbon cycle. Which arrow represents a process that releases oxygen into the atmosphere?

carbon dioxide in the air

B

A

carbohydrates in

dead organic matter

carbohydrates in animals

death death

C

D

carbohydrates in green plants

13 Eutrophication occurs after fertiliser is washed into a lake. What is not true of eutrophication? A Algae population in the lake decreases. B Bacteria population in the lake increases. C Nitrate concentration in the lake increases. D Oxygen concentration in the lake decreases.

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14 Which statement about atoms and molecules is correct? A Atoms gain or lose electrons to become molecules. B Atoms of the same element contain the same number of molecules. C Molecules are the simplest unit of an atom. D Molecules contain atoms which are covalently bonded.

15 Which diagram represents a mixture of two elements?

A

B

C

D

16 Which statement about atoms and ions is not correct? A A chlorine atom loses one electron to obtain a noble gas electronic structure. B A magnesium atom has two valency electrons. C A sodium ion, Na+, has eight electrons in its outer shell. D Oxygen atoms and oxide ions each have two occupied electron shells.

17 Which substance contains a multiple covalent bond? A hydrogen B methane C nitrogen D water

18 Which equation represents the reaction at the cathode during the electrolysis of aqueous

copper(II) chloride?

A 2Cl ? Cl 2 + 2e- B Cu2+ + 2e- Cu C 2H+ + 2e- H2 D 4OH? O2 + 2H2O + 4e-

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19 In the reaction between an acid and a metal, the rate of reaction decreases as the reaction proceeds.

A student suggests three reasons why the rate of this reaction decreases.

1 The concentration of the acid decreases as it gets used up. 2 The energy needed to break bonds is used up as the product forms. 3 The surface area of the metal increases as it gets smaller.

Which reasons are correct?

A 1, 2 and 3

B 1 and 2 only

C 1 only

D 3 only

20 The equation shows the reaction of copper oxide with carbon. copper oxide + carbon copper + carbon dioxide

In the reaction, the carbon is the ??1?? agent and is ??2?? during the reaction. Which words complete gaps 1 and 2?

1 A oxidising B oxidising C reducing D reducing

2 oxidised reduced oxidised reduced

21 Magnesium, magnesium oxide and magnesium carbonate are insoluble in water.

Which method is used to make pure crystals of magnesium sulfate? A Add an excess of magnesium carbonate to dilute sulfuric acid, filter and evaporate the filtrate

to dryness. B Add an excess of magnesium oxide to dilute sulfuric acid and leave overnight to crystallise. C Add magnesium oxide to an excess of dilute sulfuric acid and evaporate to dryness. D Add magnesium ribbon to an excess of dilute sulfuric acid, filter and evaporate to dryness.

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