GCSE
BIOLOGY
8461/1
Higher Tier Paper 1H
Tuesday 12 JUNE 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.
*jun20 4611H01*
IB/M/Jun20/E23 8461/1H
For Examiner’s Use
Questio
n
Mark
1
2
3
4
5
6
7
TOTAL
1 / 4
2
Do not write
outside the
*02
*
IB/M/
Jun20/8461/1H
0 1
0 1 1
0 1 2
Answer all questions in the spaces
provided.
box
This question is about photosynthesis.
. Complete the word equation for
photosynthesis. [2 marks]
+ → + oxygen
. 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
2 / 4
3
Do not write
outside the
*02
*
IB/M/
Jun20/8461/1H
45 1.9 14.2 2.2 2.1
3 / 4
Do not write
outside the
4
IB/M/
Jun20/8461/1H
*03
*
0 1 3
0 1 4
0 1 5
0 1 6
0 1 7
. Calculate mean value
X.
[2 marks]
box
X = cm3
/hour
The students identified one anomalous result in Table 1.
. Draw a ring around the anomalous result in
Table 1.
[1 mark]
. Suggest one possible cause of the anomalous
result. [1 mark]
. How did the students deal with the anomalous
result? [1 mark]
. Give one factor the students should have kept constant in this
investigation. [1 mark]
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