plumiClimate change: Edexcel International A Level Biology questions
Every Edexcel International A Level Biology exam question on Climate change (specification points 5.16–5.22), 2019–2025, with its mark scheme and examiner’s report.
Paper
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Calculations
Q8(c)(i)
The whole paper ↗Q8(c)(ii)
The whole paper ↗Q5(a)
The whole paper ↗Q5(b)(i)
The whole paper ↗Your answerQ7(a)
The whole paper ↗Q7(b)
The whole paper ↗Q7(c)
The whole paper ↗Q7(d)(i)
The whole paper ↗Q7(d)(ii)
The whole paper ↗Q7(e)(iii)
The whole paper ↗Q8(a)
The whole paper ↗Q8(b)(i)
The whole paper ↗Q8(b)(iii)
The whole paper ↗Q3(b)
The whole paper ↗Your answerQ4(a)(i)
The whole paper ↗Q4(a)(ii)
The whole paper ↗Q6(c)
The whole paper ↗Q3(f)
The whole paper ↗Q7(a)(i)
The whole paper ↗Q7(b)(i)
The whole paper ↗
All 61 questions on Climate change, as a list
- June 2025, Unit 4, Q8(c)(i) (1 mark): Name one other anthropogenic activity that could affect the temperature of the sand. (1)
- June 2025, Unit 4, Q8(c)(ii) (6 marks): The Tpiv for flatback turtles is 29.4 °C. A temperature of 27.7 °C will result in all males and a temperature of 31.1 °C will result in all females being produc
- January 2025, Unit 4, Q5(a) (3 marks): Pollen grains in peat bogs can be used to determine the types of plants that grew in a particular area in the past. The diagram shows the types of pollen (shade
- January 2025, Unit 4, Q5(b)(i) (1 mark): Which is the difference between the maximum and minimum temperatures in May? (1) A 5°C B 8°C C 10°C D 16°C
- January 2025, Unit 4, Q7(a) (1 mark): State one anthropogenic source of carbon dioxide and one different anthropogenic source of methane. (1) Carbon dioxide Methane
- January 2025, Unit 4, Q7(b) (3 marks): Describe how greenhouse gases cause global warming. (3)
- January 2025, Unit 4, Q7(c) (1 mark): The graph shows the changes in mean global temperature from 1975 to 2023. 1.50 1.25 1.00 0.75 Changes in mean global 0.50 temperature / C 0.25 0.00 –0.25 –0.50
- January 2025, Unit 4, Q7(d)(i) (1 mark): Calculate the ratio of the WP of nitrous oxide to the WP of methane. Give your answer to two significant figures. (1) Answer : 1
- January 2025, Unit 4, Q7(d)(ii) (3 marks): Carbon dioxide can last in the atmosphere for thousands of years. Methane lasts for about 12 years and nitrous oxide for about 121 years. Discuss the implicatio
- January 2025, Unit 4, Q7(e)(iii) (2 marks): Suggest why the scientists analysed the cultures of methanotroph B for the production of nitrous oxide and carbon dioxide. (2)
- October 2024, Unit 4, Q8(a) (3 marks): In one drop of seawater there are between 1 000 and 10 000 E. huxleyi. The diagram shows the dimensions of one E. huxleyi. diameter of cell = 50 μm thickness of
- October 2024, Unit 4, Q8(b)(i) (1 mark): One E. huxleyi can contain 12 plates. It takes 75 minutes to produce one plate. Calculate the number of hours it takes one E. huxleyi to produce 12 plates. Assu
- October 2024, Unit 4, Q8(b)(iii) (6 marks): The plates can carry viruses that infect the E. huxleyi. Infected E. huxleyi produce a glue that sticks many cells and plates together to form a ‘marine snow’.
- June 2024, Unit 4, Q3(b) (1 mark): The production of textiles and the removal of textile waste is an example of human activity affecting the environment. Which term is used to describe the effect
- January 2024, Unit 4, Q4(a)(i) (1 mark): Calculate the mean drop in height from 1980 to 2000. Give suitable units for your answer. (1) Answer
- January 2024, Unit 4, Q4(a)(ii) (3 marks): Explain why the decrease in height is greater from 1995 to 2000 than it is from 1980 to 1985. (3)
- January 2024, Unit 4, Q6(c) (3 marks): Southeast Asian forests are the oldest rainforests on Earth. Explain how the age of a tree in a rainforest can be determined, without cutting it down. (3)
- October 2023, Unit 6, Q3(f) (1 mark): Some scientists predict that climate change will increase the destruction of crops in East Africa. Suggest one reason why some scientists think this. (1)
- June 2023, Unit 4, Q7(a)(i) (1 mark): There are 345 Right whales in the Gulf of Maine and together they release 15.9 kg of nitrogen per day. Calculate the mass of nitrogen released by one Right whal
- June 2023, Unit 4, Q7(b)(i) (1 mark): There were approximately 5 million whales before modern commercial whaling. Calculate the percentage decrease in the number of whales due to commercial whaling.
- June 2023, Unit 4, Q7(b)(ii) (1 mark): Calculations have shown that if numbers could be restored, 1.7 × 109 US tons of carbon dioxide could be removed from the atmosphere per year. A US ton is equiva
- June 2023, Unit 4, Q7(b)(iii) (6 marks): Discuss the possible effects of increasing the number of whales on climate change. Use the information in the diagram and the data given in this question to sup
- January 2023, Unit 4, Q4(c) (3 marks): A rubber tree can be used to harvest rubber until it is about 32 years old. Explain how dendrochronology could be used to determine the age of a tree that is st
- January 2023, Unit 4, Q5(a)(i) (2 marks): Explain why this diagram is described as a model of the effects of an increase in temperature. (2)
- January 2023, Unit 4, Q5(a)(ii) (1 mark): Calculate the percentage increase in the population exposed to drought if the temperature increased by 2 °C and not 1.5 °C. Assume the bars in the diagram are d
- October 2022, Unit 4, Q4(a) (1 mark): The core of mud removed has a diameter of 80 mm and a length of 900 mm. Which is the volume of this core of mud? Use the formula: V = πr2l Use π = 3.142 (1) A 4
- October 2022, Unit 4, Q4(b)(i) (2 marks): Calculate how many years the plants producing type D pollen grains were present in this rainforest. (2) Answer years
- October 2022, Unit 4, Q4(b)(ii) (4 marks): Explain the distribution of these three types of pollen grain in this mud column. Use the information in this diagram to support your answer. (4)
- October 2022, Unit 4, Q8(a)(i) (1 mark): State the term used to describe climate change caused by human activity. (1)
- October 2022, Unit 4, Q8(a)(ii) (2 marks): Explain why some people consider this claim to be controversial. (2)
- October 2022, Unit 4, Q8(b) (6 marks): Discuss the effects that forest fires have on the local atmosphere and local biodiversity, in the short term and the long term. (6)
- June 2022, Unit 4, Q8(b)(i) (2 marks): The graph shows the changes in environmental temperature before and after a volcanic eruption. time of eruption 0.2 Change in environmental 0.0 temperature / °C
- June 2022, Unit 4, Q8(b)(ii) (4 marks): When this volcano erupted, sulfur dioxide and particles of ash were released into the atmosphere. Sulfur dioxide and particles of ash cause less light to pass t
- June 2022, Unit 4, Q8(b)(iii) (1 mark): The eruption of one volcano resulted in 5 × 107 metric tons of carbon dioxide entering the atmosphere in one year. The mass of carbon dioxide released into the
- June 2022, Unit 4, Q8(b)(iv) (3 marks): The graph shows the levels of carbon dioxide in the atmosphere in one region of the world from 1958 to 2004. During this period there were volcanic eruptions in
- January 2022, Unit 4, Q7(b)(i) (3 marks): Explain how food production could contribute to the greenhouse effect. (3)
- October 2021, Unit 4, Q4(a)(i) (1 mark): Calculate the radius (r) of a tree with a circumference (C) of 8 m. C Use the formula: r = 2π Give your answer to two decimal places. (1) Answer m
- October 2021, Unit 4, Q4(a)(ii) (1 mark): Calculate the distance T as a percentage of this radius. (1) Answer %
- October 2021, Unit 4, Q4(b)(i) (1 mark): Which row of the table shows the newest and oldest rings in this tree? (1) newest ring oldest ring A P Q B P S C S R D S P
- October 2021, Unit 4, Q4(b)(ii) (3 marks): Explain how these core samples can be used to calculate the age of this tree. Use the information in the question and the diagram to support your answer. (3)
- October 2021, Unit 4, Q4(b)(iii) (2 marks): Describe how the growth rate of this tree can be calculated. (2)
- October 2021, Unit 4, Q7(b)(i) (1 mark): Suggest why each point on the graph has both a horizontal and a vertical error bar plotted with it. (1)
- October 2021, Unit 4, Q7(b)(ii) (3 marks): Explain which ecosystems should be conserved to have the greatest impact on climate change. Use the information in the graph to support your answer. (3)
- June 2021, Unit 4, Q6(b)(i) (1 mark): State how carbon is exchanged between the atmosphere and the oceans. (1)
- June 2021, Unit 4, Q6(b)(ii) (1 mark): Calculate the increase in the mass of carbon in plants as a result of carbon exchange between the plants and the atmosphere in one year. Give your answer in kil
- June 2021, Unit 4, Q6(c)(i) (2 marks): State what is meant by the term anthropogenic climate change. (2)
- June 2021, Unit 4, Q6(c)(ii) (2 marks): Explain one way in which the effects of anthropogenic climate change can be reduced. (2)
- January 2021, Unit 4, Q4(a)(i) (1 mark): Which of the following are greenhouse gases? (1) A carbon dioxide and oxygen B methane and water vapour C carbon dioxide, oxygen and water vapour D methane, car
- January 2021, Unit 4, Q4(a)(ii) (2 marks): State what is meant by anthropogenic climate change. (2)
- January 2021, Unit 4, Q4(b) (3 marks): The distribution of species has been affected by climate change. The diagrams show how the distribution of one species, in a country in the Northern Hemisphere,
- January 2021, Unit 4, Q4(c)(i) (2 marks): Identify two conclusions that can be drawn from this study. (2)
- January 2021, Unit 4, Q4(c)(ii) (3 marks): Explain the differences in the results obtained for the male and female beetles kept at different temperatures. (3)
- October 2020, Unit 4, Q9(a)(i) (1 mark): In 2016, the moose were not counted. The value shown on the graph is an estimate. Describe how these data were used to estimate the number of moose in 2016. (1)
- October 2020, Unit 4, Q9(a)(ii) (2 marks): Calculate the percentage decrease in the number of moose from 1994 to 2016. (2) Answer %
- October 2020, Unit 4, Q9(a)(iii) (3 marks): It has been suggested that global warming is responsible for the decrease in the number of moose from 1994 to 2016. Sketch a graph to show this relationship. (3
- October 2020, Unit 4, Q9(b)(ii) (6 marks): The diagram shows the life cycle of the tick. Early spring June Female ticks, fully engorged on After several weeks’ dormancy, blood, drop off the moose. the fe
- January 2020, Unit 4, Q3(a) (1 mark): Which of the following gases could be responsible for these temperature changes? (1) A carbon dioxide and methane B carbon dioxide and oxygen C carbon dioxide,
- January 2020, Unit 4, Q3(b) (1 mark): What is the estimated change in the mean temperature of the surface of the Earth in 2030? (1) A 1.3 B 1.1 C 0.8 D 0.2
- January 2020, Unit 4, Q3(c) (1 mark): Ultraviolet light has a shorter wavelength than infrared radiation. Which row of the table describes the passage of ultraviolet light and infrared radiation, re
- January 2020, Unit 4, Q3(d)(i) (1 mark): Which of the following involves the study of tree rings? (1) A dendrochronology B entomology C epigenetics D proteomics
- January 2020, Unit 4, Q3(d)(ii) (3 marks): Explain why the width of tree rings produced in 1970 would be different from the width of tree rings produced in 2010. (3)
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