*jun2084611H01*

IB/M/Jun20/E23 8461/1H

For Examiner’s Use

Question Mark

1

2

3

4

5

6

7

TOTAL

Tuesday 12 May 2020 Afternoon Time allowed: 1 hour 45 minutes

Materials

For this paper you must have:

• a ruler

• a scientific calculator.

Instructions

• Use black ink or black ball-point pen.

• Pencil should only be used for drawing.

• Fill in the boxes at the top of this page.

• Answer all questions in the spaces provided.

• If you need extra space for your answer(s), use the lined pages at the end of

this book. Write the question number against your answer(s).

• Do all rough work in this book. Cross through any work you do not want

to be marked.

• In all calculations, show clearly how you work out your answer.

Information

• The maximum mark for this paper is 100.

• The marks for questions are shown in brackets.

• You are expected to use a calculator where appropriate.

• You are reminded of the need for good English and clear presentation

in your answers.

Please write clearly in block capitals.

Centre number Candidate number

Surname

Forename(s)

Candidate signature

I declare this is my own work.

GCSE

BIOLOGY

Higher Tier Paper 1H

H

AQA

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*02*

IB/M/Jun20/8461/1H

Answer all questions in the spaces provided.

0 1 This question is about photosynthesis.

0 1 . 1 Complete the word equation for photosynthesis.

[2 marks]

+ → + oxygen

0 1 . 2 Describe how energy for the photosynthesis reaction is gained by plants.

[2 marks]

Students investigated the effect of temperature on the rate of photosynthesis.

The students shone light from a lamp onto pondweed and measured the volume of

oxygen produced per hour.

Table 1 shows the results.

Table 1

Temperature

in °C

Rate of photosynthesis in cm3

/hour

Test 1 Test 2 Test 3 Mean

20 18.5 19.3 19.5 X

25 32.6 34.1 32.9 33.2

30 41.9 45.2 44.9 44.0

35 38.6 39.8 44.0 40.8

40 23.1 20.5 22.4 22.0

45 1.9 14.2 2.2 2.1

Do not write

outside the

box

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*03*

Turn over ►

IB/M/Jun20/8461/1H

Do not write

outside the

box 0 1 . 3 Calculate mean value X.

[2 marks]

X = cm3

/hour

The students identified one anomalous result in Table 1.

0 1 . 4 Draw a ring around the anomalous result in Table 1.

[1 mark]

0 1 . 5 Suggest one possible cause of the anomalous result.

[1 mark]

0 1 . 6 How did the students deal with the anomalous result?

[1 mark]

0 1 . 7 Give one factor the students should have kept constant in this investigation.

[1 mark]

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*04*

IB/M/Jun20/8461/1H

Do not write

outside the

box Table 1 is repeated below.

Table 1

Temperature

in °C

Rate of photosynthesis in cm3

/hour

Test 1 Test 2 Test 3 Mean

20 18.5 19.3 19.5 X

25 32.6 34.1 32.9 33.2

30 41.9 45.2 44.9 44.0

35 38.6 39.8 44.0 40.8

40 23.1 20.5 22.4 22.0

45 1.9 14.2 2.2 2.1

0 1 . 8 Why did the rate of photosynthesis decrease from 35 °C to 45 °C?

[1 mark]

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