GCSE Combined Science: Trilogy - Biology Paper 1H (Higher Tier) - Exam Questions June 2021

Sep 5, 2026

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GCSE Combined Science Biology paper (Higher Tier) focusing on photosynthesis and fermentation, with additional questions on testing food samples for macronutrients. The exam includes an investigation into how light intensity affects the rate of photosynthesis using pondweed, requiring identification of the correct photosynthesis equation, selection of the independent variable, calculation of reaction rate from tabulated data, plotting results with a line of best fit, and prediction for an untested distance. It also tests understanding of exothermic reactions and interpreting practical chemistry procedures, including food tests for protein, starch and sugar.

LanguageEnglish

CategoryExam

FormatPDF

Pages28

Reading Time1 h 11 min

AccessFree to download

Photosynthesis

Photosynthesis equation

Independent variable

Effect of temperature and improving validity

Rate calculation and conclusions

Line of best fit and prediction

Testing food samples

Protein, starch and sugar color changes

Fermentation in yeast

Meaning of exothermic

Practical setup (temperature effect)

| Please write clearly in block capitals. | | | | | --- | --- | --- | --- | | Centre number | | Candidate number | | | Surname
Forename(s)
Candidate signature
I declare this is my own work. | | | | GCSE COMBINED SCIENCE: TRILOGY Higher Tier Biology Paper 1 H H Time allowed: 1 hour 15 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. | For Examiner’s Use | | | --- | --- | | Question | Mark | | 1 | | | 2 | | | 3 | | | 4 | | | 5 | | | 6 | | | TOTAL | | Information • The maximum mark for this paper is 70. • 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. *jun218464b1h01* IB/M/Jun21/E7 8464/B/1H | 0 1 Plants absorb light for photosynthesis.
| | --- | | 0 1 . 1
Which is the equation for photosynthesis? Tick ( 􀀹 ) one box.
C6 H 12O6 + 6 O2 → 6 CO2 + 6 H2O
6 CO2 + 6 H2O → C6 H 12O6 + 6 O2
6 H2O + 6 O2 → C6 H 12O6 + 6 CO2
6 O2 + 6 CO2 → C6 H 12O6 + 6 H2O

[1 mark] | | A student investigated the effect of light intensity on the rate of photosynthesis.
Figure 1 shows the apparatus.
Figure 1
| Do not write outside the box This is the method used. 1. Set up the apparatus as shown in Figure 1. 2. Place the pondweed 10 cm away from the lamp. 3. Switch on the lamp. 4. Record the number of bubbles of gas produced in 5 minutes. 5. Repeat steps 2 to 4 with the pondweed at different distances from the lamp. 0 1 . 2 What was the independent variable in this investigation? Tick ( 􀀹 ) one box. Distance of the pondweed from the lamp Length of the piece of pondweed Number of bubbles of gas produced Time taken to collect the gas [1 mark] Question 1 continues on the next page outside the box The lamp gets warm when it is on. This causes the temperature of the water to increase. Explain how an increase in temperature would affect the results of this investigation. [2 marks] Suggest one way the investigation could be improved so the temperature of the water does not increase. [1 mark] Suggest two improvements to the investigation so the results would be more valid. Do not refer to controlling the temperature of the water. [2 marks] 1 2 | 0 | 1 | . | 3 | | --- | --- | --- | --- | | 0 | 1 | . | 4 | | --- | --- | --- | --- | | 0 | 1 | . | 5 | | --- | --- | --- | --- | outside the box Question 1 continues on the next page DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED outside the box Table 1 shows the results. Table 1 | Distance of pondweed from the lamp in cm | Number of bubbles of gas produced in 5 minutes | | --- | --- | | 10 | 120 | | 20 | 56 | | 30 | 31 | | 40 | 16 | | 50 | 10 | | 0 | 1 | . | 6 | | --- | --- | --- | --- | Calculate the rate of photosynthesis when the pondweed was 40 cm from the lamp. Give the rate of photosynthesis as the number of bubbles of gas produced per minute. [1 mark] Rate = bubbles of gas produced per minute Give one conclusion that can be made from Table 1. [1 mark] | 0 | 1 | . | 7 | | --- | --- | --- | --- | outside the box | | | | | | Plot the data from Table 1 on Figure 2. | outside box | | --- | --- | --- | --- | --- | --- | --- | | | 0 | 1 | . | 8 | | | | Draw a line of best fit.
[3 marks]
Figure 2
| | | | | | | | | 0 | 1 | . |

FAQs

How can a food sample be tested for protein, starch and sugar?

Use the appropriate standard chemical tests for each macronutrient and record the observed colors to indicate whether protein, starch, and sugar are present.

Sep 5, 2026

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