Variation — Paper 1 · IGCSE Biology (9-1) 0970

34 What will cause the rate of mutation to increase? A increase in exposure to ionising radiation B increase in genetic variation in a population C increase in phenotypic variation in a population D increase in the rate of reproduction

1 marks

Answer: A

This question in 0970/11 May/June 2018

40 What is a negative impact to an ecosystem of large-scale monoculture? A Crops need harvesting at the same time. B Monocultures produce less food. C Monocultures produce more food. D The genetic variation of organisms is reduced.

1 marks

Answer: D

This question in 0970/11 May/June 2018

32 Which is an example of discontinuous variation? A height B skin colour C tongue rolling D weight

1 marks

Answer: C

This question in 0970/12 Oct/Nov 2018

32 Which human characteristics are inherited? earlobe eye skin anguage shape colour colour A J J x J B J J x x Cc v x x Jv D x J J J key J = inherited X = not inherited

1 marks

Answer: A

This question in 0970/11 May/June 2019

34 Which definition of continuous variation is correct? A variation that results in a limited number of phenotypes between two extremes B variation that results in a limited number of phenotypes with no intermediates C variation that results in a range of phenotypes between two extremes D variation that results in a range of phenotypes with no intermediates

1 marks

Answer: C

This question in 0970/11 May/June 2019

35 When is evolution by natural selection most likely to occur? A when there is a stable population of predators B when there is a stable environment C when there is less variation in the population D when there is more variation in the population

1 marks

Answer: D

This question in 0970/11 May/June 2019

34 The graph shows the masses of two different types of tomato. type 1 type 2 number of tomatoes 0 20 40 60 80 100 120 140 160 180 200 220 240 mass / g What can be concluded from the graph? A Genes do not affect the mass of tomatoes. B Type 1 tomatoes show continuous variation. C Type 2 tomatoes are sometimes smaller than type 1 tomatoes. D Type 2 tomatoes show discontinuous variation.

1 marks

Answer: B

This question in 0970/11 May/June 2020

34 The graph shows the masses of two different types of tomato. type 1 type 2 number of tomatoes 0 20 40 60 80 100 120 140 160 180 200 220 240 mass / g What can be concluded from the graph? A Genes do not affect the mass of tomatoes. B Type 1 tomatoes show continuous variation. C Type 2 tomatoes are sometimes smaller than type 1 tomatoes. D Type 2 tomatoes show discontinuous variation.

1 marks

Answer: B

This question in 0970/12 May/June 2020

34 Some human phenotypes are listed. 1 body mass 2 foot size 3 height 4 sex Which features are examples of continuous variation? A 1, 2 and 3 B 1, 3 and 4 C 1 and 4 only D 2 and 3 only

1 marks

Answer: A

This question in 0970/12 Oct/Nov 2020

35 The graph shows the distribution of blood groups in one area. 60 50 40 percentage 30 of population 20 10 0 AB A B O blood group This is an example of discontinuous variation. Which statement about discontinuous variation is correct? A There is a range of genotypes between two extremes. B There is a range of phenotypes between two extremes. C There are intermediates between the phenotypes. D There are no intermediates between the phenotypes.

1 marks

Answer: D

This question in 0970/11 May/June 2021

35 Which statement about selective breeding is correct? A It does not involve humans. B It involves a struggle for survival. C It always involves only one parent. D It involves parents that possess desirable features.

1 marks

Answer: D

This question in 0970/11 May/June 2022

29 The graph shows the relationship between deaths from lung cancer and the number of cigarettes smoked per day. Cigarettes contain tobacco. 300 250 deaths from 200 lung cancer 150 per 100 000 people 100 50 0 0 10 20 30 40 number of cigarettes smoked per person per day Which statement is a possible conclusion for the data shown in the graph? A A person will die of lung cancer only if they smoke. B A person’s health is only affected if they smoke more than 10 cigarettes per day. C A person will have less chance of dying of lung cancer if they smoke fewer cigarettes. D If a person smokes more than 40 cigarettes per day, their risk of dying from lung cancer is the same as a person who smokes 40 cigarettes per day.

1 marks

Answer: C

This question in 0970/12 May/June 2022

34 The graph shows the different heights of people in a human population. number of people height Which row describes the variation shown by the graph? has intermediate type of variation phenotypes A continuous no B continuous yes C discontinuous no D discontinuous yes

1 marks

Answer: B

This question in 0970/12 May/June 2022

34 Which phenotype shows discontinuous variation in humans? A foot length B height C sex D weight

1 marks

Answer: C

This question in 0970/12 Oct/Nov 2022

35 What can increase the genetic variation in a species? A growth B malnutrition C mitosis D mutation

1 marks

Answer: D

This question in 0970/12 Oct/Nov 2022

35 Which term is a genetic change? A allele B genotype C mutation D phenotype

1 marks

Answer: C

This question in 0970/11 May/June 2023

31 Which human characteristics are inherited? 0 0O WwW > blood group Ko 4 eye colour ~ KOK language \ & \& x Sex Q 48M key J = inherited X = not inherited

1 marks

Answer: A

This question in 0970/12 May/June 2023

35 Which definition of continuous variation is correct? A variation that results in a limited number of phenotypes between two extremes B variation that results in a limited number of phenotypes with no intermediates C variation that results in a range of phenotypes between two extremes D variation that results in a range of phenotypes with no intermediates

1 marks

Answer: C

This question in 0970/12 May/June 2023

35 Some phenotypes are listed. 1 blood group 2 body mass 3 height 4 seed colour in peas Which phenotypes are examples of continuous variation? A 1, 2 and 3 B 2 and 3 only C 2 and 4 D 3 and 4

1 marks

Answer: B

This question in 0970/12 Oct/Nov 2023

36 The list shows statements about selection. 1 Individuals reproduce and pass on their alleles to the next generation. 2 Genetic variation exists between individuals and many offspring are produced. 3 Individuals struggle for survival and compete for resources. 4 Individuals that are better adapted to the environment survive. 5 Individuals with desirable features are selected by humans. Which statements are correct descriptions of natural selection? A 1, 2, 3 and 4 B 1, 2 and 5 only C 2, 3 and 4 only D 3, 4 and 5 only

1 marks

Answer: A

This question in 0970/11 May/June 2024

37 When white-flowered pea plants are crossed with red-flowered pea plants, the offspring plants all have red flowers. If these offspring plants are crossed, the next generation of plants contains both red-flowered and white-flowered plants. Which statement explains this? A The allele for red flowers is dominant, and the offspring plants are heterozygous. B The allele for red flowers is dominant, and the offspring plants are homozygous. C The allele for red flowers is recessive, and the offspring plants are heterozygous. D The allele for red flowers is recessive, and the offspring plants are homozygous.

1 marks

Answer: A

This question in 0970/12 Oct/Nov 2024

33 Humans produce two types of ear wax, either wet or dry. Which row describes the variation in human ear wax? type of variation controlled by A continuous genes and environment B continuous genes only C discontinuous genes and environment D discontinuous genes only

1 marks

Answer: D

This question in 0970/11 May/June 2025

31 Which characteristic is an example of continuous variation? A ABO blood groups in humans B body mass in cats C seed colour in pea plants D seed shape in pea plants

1 marks

Answer: B

This question in 0970/12 May/June 2025

30 Which statement about variation and example is correct? A Continuous variation is caused by the environment and genes. An example is ABO blood groups. B Continuous variation is usually caused by genes only. An example is body mass. C Discontinuous variation is caused by both the environment and genes. An example is body mass. D Discontinuous variation is usually caused by genes only. An example is ABO blood groups.

1 marks

Answer: D

This question in 0970/12 Oct/Nov 2025