GCSE SCI Double Award Modular Non Modular PP November 2009 Higher Tier Living Organisms and the...

8/6/2019 GCSE SCI Double Award Modular Non Modular PP November 2009 Higher Tier Living Organisms and the Processes

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General Certificate of Secondary Education

20092010

Science: Double Award (Modular)

Living Organisms and the Processes of LifeEnd of Module Test

Higher Tier

[GDA02]

MONDAY 16 NOVEMBER 2009, AFTERNOON

5492

TIME

45 minutes.

INSTRUCTIONS TO CANDIDATES

Write your Centre Number and Candidate Number in the spaces

provided at the top of this page.

Write your answers in the spaces provided in this question paper.

Answer all thirteen questions.

INFORMATION FOR CANDIDATES

The total mark for this paper is 50.

Figures in brackets printed down the right-hand side of pages indicate

the marks awarded to each question or part question.

71

Centre Number

Candidate Number

A

TotalMarks

GDA02

For Examinersuse only

QuestionMarks Number

1

2

3

4

5

6

7

8

9

10

11

12

13


2/16

5492 2 [Turn over

Examiner Only

Marks Remark

1 When disease-causing bacteria enter the body, some white blood cells

respond by producing antibodies as shown in the diagram.

White blood cell

AntibodiesBacteria

Structure X

+

(a) Name the structures X on the surface of the bacteria that stimulate the

white blood cell to produce antibodies.

_______________________________________________________[1]

(b) Use the diagram and your knowledge to describe how the antibodies

combat the bacteria.

_________________________________________________________

_________________________________________________________

_______________________________________________________[2]


3/16

5492 3 [Turn over

Examiner Only

Marks Remark

2 The diagram shows a section through an eye.

B

Iris

(a) What is the function of the iris?

[1]

(b) Name part B.

[1]

(c) Use the diagram and your knowledge to explain how light rays that

enter the eye are focused onto the retina.

[2]


4/16

5492 4 [Turn over

Examiner Only

Marks Remark

3 (a) Give two functions of the circulatory system.

1. _______________________________________________________

2. _____________________________________________________[2]

(b) An outline of the human circulatory system is shown.

Lungs

Liver

Stomachand intestine

Kidneys

A

(i) Name blood vessel A.

___________________________________________________[1]

(ii) Give one difference in the composition of the blood in vessel A and

in the vena cava.

_____________________________________________________

___________________________________________________[1]

(c) Name the blood vessel, not shown in the diagram, that can become

blocked resulting in a heart attack.

_______________________________________________________[1]


5/16

5492 5 [Turn over

Examiner Only

Marks Remark

4 The energy content of a piece of bacon was measured using the apparatus

shown.

Water (20 g)

Test-tube

Bacon (10 g)

Thermometer

In the experiment, the bacon was set alight and used to heat up the water

(20 g) in the test-tube.

The energy in the bacon can be calculated using the equation:

Energy (J) = Mass of water (g) 4.2 temperature rise in water (C)

(a) If the burning of the bacon caused the temperature to rise by 22 C,

calculate the energy in the bacon.

_________________ J [1]

(b) Explain why the calculated energy value given in (a) is an

underestimate of the total energy in the bacon.

_______________________________________________________[1]

(c) If you were comparing the energy in bacon with that in a piece of

biscuit, give two ways in which you would ensure that the comparison

would be fair.

1. _______________________________________________________

2. _____________________________________________________[2]


6/16

5492 6 [Turn over

Examiner Only

Marks Remark

5 Red blood cells were examined before and after being placed in a strong

salt solution.

Before After

Explain the change in the appearance of the cells after being placed in the

strong salt solution.

[3]


7/16

5492 7 [Turn over

Examiner Only

Marks Remark

6 The apparatus shown is used to measure the rate of anaerobic respiration.

Water

Layer of oil

Sugar solution

and microbe

Graduated cylinder

(a) The sugar solution was made with water that had been boiled and

allowed to cool. Suggest the reason for boiling the water.

[1]

(b) Name the microbe used in this experiment.

[1]

(c) Use the diagram to suggest how you would measure the rate of

anaerobic respiration.

[1]


8/16

5492 8 [Turn over

Examiner Only

Marks Remark

7 The diagram shows the structures involved in a reflex action when a person

pricks a finger on a drawing pin.

B

A

Finger (sensory organ)

Muscle in arm

(effector organ)

>

>

(a) (i) Use arrows to show the direction in which a nerve impulse travels

along the neurones A and B. [1]

(ii) Name the neurone labelled B.

[1]

(b) Co-ordination in the body is controlled by both nerves and hormones.

Name a hormone responsible for increasing heart rate.

[1]


9/16

5492 9 [Turn over

Examiner Only

Marks Remark

8 The apparatus shown was used to investigate the effect of light on gas

exchange in a water plant. Hydrogencarbonate indicator was used to show

any changes in carbon dioxide levels. At normal atmospheric levels of

carbon dioxide the indicator is orange-red.

Bright light

Water bath

Hydrogencarbonate

indicator

Tin foil Muslin

(blocks out

some light)

A B C

Decreased IncreasedPurple Indicator Yellow

carbondioxide

carbondioxide

The experiment was left for one hour. Complete the table below to show the

results of the experiment and give an explanation of these results.

TubeInitial colour

of indicator

Final colour

of indicatorBiological explanation of result

A Orange-red

B Orange-red Orange-red

C Orange-red

[5]


10/16

5492 10 [Turn over

Examiner Only

Marks Remark

9 An enzyme which breaks down starch to sugar (maltose) was mixed with

starch and the time taken to completely break down the starch was recorded.

The experiment was carried out at different temperatures and the results are

shown in the table below.

Temperature/C Time taken to completely break downthe starch/minutes

5 Starch not broken down

10 15

20 7

30 3

40 1

50 6



(a) Name the enzyme used in this experiment.

[1]

(b) Between which two temperatures was the starch broken down most

rapidly?

and C [1]

(c) Explain why the starch was not broken down at 60 C.

[1]

(d) Name one variable that must be controlled in this experiment.

[1]


11/16

5492 11 [Turn over

Examiner Only

Marks Remark

10 The concentration of nitrate ions in a root hair cell and the surrounding soil

water is shown.

Soil water

Root hair cell

Explain how the cell is able to build up the high concentration of nitrate

ions as shown.

____________________________________________________________

____________________________________________________________

____________________________________________________________

__________________________________________________________[3]


12/16

5492 12 [Turn over

Examiner Only

Marks Remark

11 The graph shows the effect of increasing levels of carbon dioxide on the rate

of photosynthesis in wheat.

00

Rate ofphotosynthesis

/arbitrary

units

0.04 0.08 0.12

Carbon dioxide concentration/%

0.16 0.20

A B

(a) Suggest why the rate of photosynthesis levelled off between A and B.

_________________________________________________________

_______________________________________________________[1]

(b) Commercial tomato growers sometimes add extra carbon dioxide to

their glasshouses.

(i) Describe and explain a likely benefit of adding extra carbon

dioxide.

_____________________________________________________

_____________________________________________________

___________________________________________________[2]

(ii) Explain why the addition of the extra carbon dioxide is stopped

about one hour before darkness falls.

_____________________________________________________

___________________________________________________[1]


13/16


14/16

5492 14 [Turn over

Examiner Only

Marks Remark

13 The apparatus shown below is used to measure gas exchange in a snail.

Volume changes in the apparatus are measured by the movement of the

coloured dye.

Potassiumhydroxide

solution

Air tight bung

Snail

Wire basket

Scale markings

U-tube

Coloured dye

Potassium hydroxide absorbs carbon dioxide. Explain why the coloured

dye would move upwards in the left arm of the U-tube as the experiment

proceeds.

[4]

THIS IS THE END OF THE QUESTION PAPER


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GCSE SCI Double Award Modular Non Modular PP November 2009 Higher Tier Living Organisms and the...

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