plumiSpecies richness and heterozygosity index: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 4.5.2 Species richness and heterozygosity index, 2019–2025, with mark schemes and examiner’s reports where available.
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Q3(b)(iii)
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All 24 questions on Species richness and heterozygosity index, as a list
- June 2025, AS Unit 2, Q3(b)(iii) (1 mark): The heterozygosity index is a way of measuring the genetic diversity in a population. Write an equation for the heterozygosity index. (1)
- June 2025, Unit 4, Q1(d) (3 marks): Describe how to determine the biodiversity of Redonda to show the effectiveness of the conservation project. (3)
- June 2025, Unit 4, Q4(b)(ii) (4 marks): Deduce the importance of establishing a tiger corridor in Bhutan for a greater increase in the number and diversity of tigers. Use the information in the first
- January 2025, AS Unit 2, Q5(d)(i) (1 mark): How many of the peony plants in this population are heterozygous for gene PS105? (1) A 15 B 60 C 340 D 350
- October 2024, AS Unit 2, Q2(b) (3 marks): It is predicted that diatom populations will decrease in number due to global warming. Scientists have suggested that this will cause a decrease in ocean biodiv
- October 2024, AS Unit 2, Q8(b) (1 mark): A scientist calculated the heterozygosity index of a population of 5 457 Akhal-Teke horses to be 0.661. How many of these horses are heterozygotes? (1) A 1 850
- June 2024, AS Unit 2, Q7(b)(i) (1 mark): Scientists wanted to determine the heterozygosity index of the Malayan tapir species. Which equation can be used to calculate the heterozygosity index? (1) Equa
- January 2024, AS Unit 2, Q3(a)(ii) (1 mark): The heterozygosity index for a cluster of 8 000 Monarch butterflies was calculated as 0.166. Calculate the number of heterozygotes in this cluster. (1) Answer
- January 2024, AS Unit 2, Q3(b) (3 marks): Female Monarch butterflies lay fertilised eggs on the leaves of milkweed plants. Herbicides can be used by farmers to kill plants such as milkweed. Farmers in t
- January 2024, AS Unit 2, Q5(b)(i) (1 mark): State what is meant by species richness. (1)
- June 2023, AS Unit 2, Q8(b) (3 marks): Snow leopards are found in several areas in Asia. The map shows the areas where snow leopards can be found. Key Areas in which snow leopards are found Russia Ka
- October 2022, AS Unit 2, Q7(a) (1 mark): State what is meant by the term species richness. (1)
- June 2022, AS Unit 2, Q8(c)(i) (2 marks): Suggest what information the scientists would need to collect in order to calculate species richness in a habitat in Yellowstone National Park. (2)
- January 2022, AS Unit 2, Q7(a) (1 mark): Sumatra is described as having a high species richness. State what is meant by the term species richness. (1)
- January 2022, AS Unit 2, Q7(c)(ii) (1 mark): The heterozygosity index of the 500 titan arum plants in botanical gardens was found to be 0.166. Calculate the number of heterozygotes in this population. (1)
- January 2022, Unit 4, Q1(d) (3 marks): Climate change is resulting in habitat fragmentation. Habitat fragmentation causes groups of polar bears to become separated from one another. Explain the effec
- June 2021, Unit 4, Q1(a)(ii) (1 mark): What is the percentage increase in the number of species of moss between the fields cut regularly and the fields not cut? (1) A 23.3 B 70.0 C 233.3 D 333.3
- January 2021, AS Unit 2, Q8(c) (2 marks): One way of studying the genetic diversity within a species is to calculate the heterozygosity index. Describe how the scientists could calculate the heterozygos
- January 2020, AS Unit 2, Q8(a)(i) (1 mark): The biodiversity of this area of Bhitarkanika National Park could be measured by calculating species richness. Which of the following describes species richness
- January 2020, AS Unit 2, Q8(a)(ii) (2 marks): Describe one other way in which the biodiversity of this area of Bhitarkanika National Park could be measured. (2)
- June 2019, AS Unit 2, Q6(a)(i) (1 mark): Which of the following can be used to calculate genetic diversity? (1) A Hardy–Weinberg equation B heterozygosity index C index of diversity D mitotic index
- June 2019, AS Unit 2, Q6(a)(ii) (2 marks): Give two differences between genetic diversity and species richness. (2) 1 2
- June 2019, AS Unit 2, Q6(c)(ii) (4 marks): Banana plants can reproduce asexually. Most of the bananas grown by farmers around the world are clones from a single parent banana plant called ‘The Cavendish’
- June 2019, AS Unit 2, Q8(b) (6 marks): Some scientists were concerned that the low numbers of beavers reintroduced into Scotland from Norway could affect the genetic diversity of the population in Sc
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