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SPECIMEN H
GENERAL CERTIFICATE OF SECONDARY EDUCATION
TWENTY FIRST CENTURY SCIENCE A163/02
BIOLOGY A
Unit 3: Module B7 (Higher Tier)


Candidates answer on the question paper
A calculator may be used for this paper.

OCR Supplied Materials:
None Duration: 1 hour

Other Materials Required:
Pencil
Ruler (cm/mm)


Candidate Candidate
Forename…

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Answer all the questions.
1 The bones of the human skeleton are held together at joints, which allow movement.
The diagram shows the knee joint of the human skeleton.




Explain how the parts of the knee joint enable it to function.

The quality of written communication will be assessed…

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2 This question is about the heart and heart disease.
(a) Look at the diagram of the heart.
(i) Complete the two labels on the diagram below.




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X

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[1]


(ii) Suggest what would happen if structure X was faulty and the problems that this could
cause.


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(b) Eating too much fatty food can increase the risk of heart disease.
Read the article about heart disease.
Heart disease is related to blood cholesterol levels
Doctors say that the number of cases of heart disease in the population is directly related to
the level of cholesterol in…

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3 Our bodies maintain a constant body temperature of 37 °C.
(a) These steps explain one way in which the body controls its own temperature.
They are in the wrong order.
A information sent to the hypothalamus

B blood flow to the skin's surface increases or decreases

C receptors…

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(b) When the human body is in danger of cooling down, it responds in order to maintain its core
temperature.
Draw a straight line from each structure to the action it takes to maintain core temperature.
Then draw a straight line from each correct action to the role it…

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4 Natural ecosystems can be unbalanced by human activity.
(a) A gardener notices that the pond in her garden has turned green and all of the fish have died.
She suspects that this may be because she used inorganic fertiliser in her garden.
Explain to the gardener how using…

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(c) Energy can be generated in many ways.
Which of the following ways to generate electricity could meet the requirements of a closed
loop system?
Put ticks () in the boxes next to the correct answers.

burning coal in a power station

generating electricity from the wind

using petrol…

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5 This question is about genetic modification.
(a) Explain how bacteria can be genetically modified to produce human insulin.
Suggest benefits of using human insulin rather than insulin extracted from animals.

The quality of written communication will be assessed in your answer to this question.

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(b) Wheat can be genetically modified to be resistant to weed killer.
This helps farmers to keep their wheat crop free of weeds, maximise the yield and earn
more profit. It also helps consumers by providing a larger supply of food.
However, some people are opposed to the genetic…

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