plumiBiodiversity and endemism: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 4.5.1 Biodiversity and endemism, 2019–2025, with mark schemes and examiner’s reports where available.
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Q1(b)
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All 29 questions on Biodiversity and endemism, as a list
- June 2025, Unit 4, Q1(b) (1 mark): Which term describes the species of lizards found only on Redonda? (1) A Archaea B endemic C epigenetic D sustainable
- January 2025, AS Unit 2, Q8(a)(i) (2 marks): Suggest why the population of the St Helena plover decreased after the introduction of cats and rats to the island. (2)
- October 2024, AS Unit 2, Q3(a) (1 mark): This plant is endemic to Indonesia. State what is meant by the term endemic. (1)
- October 2024, AS Unit 2, Q5(a)(i) (2 marks): This species of tree is endangered. Identify two reasons why this species of tree is endangered. Use the information above and the photographs to support your a
- June 2024, AS Unit 2, Q7(c)(i) (1 mark): Give one similarity between the current and earlier distribution of the Malayan tapir. (1)
- June 2024, AS Unit 2, Q7(c)(ii) (1 mark): One difference is that the distribution has reduced due to human activity. Suggest one reason why human activity has caused this change in distribution. (1)
- January 2024, AS Unit 2, Q8(a)(i) (1 mark): Which of the following is a term used to describe the fact that this subspecies of island fox is found only on Santa Cruz? (1) A diversity B endemic C mutation
- June 2023, AS Unit 2, Q5(a)(i) (1 mark): Which of the following is a term used to describe the fact that this fish is found only in Lake Tanganyika? (1) A diversity B endemic C homozygous D specific
- June 2023, AS Unit 2, Q8(c)(ii) (1 mark): Suggest one reason for this decrease in the number of snow leopards. (1)
- January 2023, Unit 4, Q7(b)(i) (1 mark): State the meaning of the term endemic, as used in the context of this question. (1)
- January 2023, Unit 4, Q7(b)(ii) (1 mark): Give one reason why habitat fragmentation could endanger these birds. (1)
- 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, AS Unit 2, Q5(a)(i) (1 mark): The Hawaii palila honeycreeper is found only in the mountainous forest on one island. Which of the following is the term used to describe this distribution? (1)
- June 2022, AS Unit 2, Q8(d) (6 marks): Beavers and elk eat the shoots of young trees. Beavers use older trees to build dams in the rivers, which create new habitats, such as ponds. Beavers live in co
- January 2022, AS Unit 2, Q9(a) (1 mark): Which of the following is a term that would be used to describe the fact that this species of giant tortoise is found only on the Galapagos Islands? (1) A diver
- October 2021, AS Unit 2, Q5(a) (3 marks): This species of tree is endangered and the export of wood from these trees is forbidden from some countries. Suggest three reasons why this species of tree is e
- October 2021, Unit 4, Q6(a) (2 marks): State the meaning of the term biodiversity. (2)
- June 2021, AS Unit 2, Q7(a) (3 marks): The population of Santa Cruz increases by approximately 6.4% per year. The majority of the population, 85%, live in urban areas. The population of Santa Cruz li
- June 2021, AS Unit 2, Q7(b) (1 mark): Non‑endemic species have been introduced to the Galapagos Islands. The graph shows the number of tourists to all the islands and the number of recorded non‑ende
- June 2021, AS Unit 2, Q7(c)(ii) (5 marks): Explain why the spread of the wild blackberry affects the biodiversity of the island. (5)
- June 2021, AS Unit 3, Q2(a)(ii) (2 marks): State what is meant by the term biodiversity. (2)
- January 2021, AS Unit 2, Q8(a) (3 marks): Suggest how human activity could cause the extinction of the Sehuencas water frog in the wild. (3)
- October 2020, AS Unit 2, Q8(a)(ii) (2 marks): It has been predicted that the population will continue to decline by 5.3% per year. Calculate the predicted albatross population after one year. (2) Answer
- January 2020, AS Unit 2, Q5(a)(i) (1 mark): State what is meant by the term endemic with reference to this kingfisher. (1)
- January 2020, AS Unit 2, Q8(b) (3 marks): Saltwater crocodiles are found in the rivers in this area. The numbers of this endangered species have decreased over the past 40 years. Explain the possible ca
- January 2020, Unit 4, Q4(a)(i) (3 marks): From 2000 to 2012, Malaysia lost 14.4% of its rainforest. This is equivalent to 47 278 km2. Calculate the area of Malaysia covered by rainforest in 2000. Give y
- January 2020, Unit 4, Q4(a)(ii) (2 marks): A decrease in the area covered by rainforest results in both a decrease in biodiversity and a decrease in populations. Explain why a decrease in the area covere
- June 2019, AS Unit 2, Q2(b) (4 marks): Explain the relationship between the concentration of herbicide and the mean number of species of insects in the three fields. Use the information in the graph
- June 2019, AS Unit 2, Q8(a) (4 marks): Explain how the reintroduction of beavers resulted in a change in the biodiversity in Scotland. (4)
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