Selection

The diagram illustrates a species changing so that it can survive in two different habitats. Which process causes these changes?

May/June 2015

As time passes, one bird species evolves a beak that is more sharply pointed. This pointed beak shape makes it easier for the birds to catch small insects that could be concealed in cracks among the rocks. What is a reason for the change in the shape of the birds’ beaks?

May/June 2015

Which plants are most likely to adapt successfully when the climate in their environment changes?

May/June 2017

Across many hundreds of years, the milk production of a specific kind of farm animal has risen steadily. How has this been achieved?

May/June 2017

Which plants are most likely to adapt successfully when the climate changes in their environment?

May/June 2017

What is required for natural selection to take place?

May/June 2017

Fig. 7.1 shows bacteria growing on the surface of a dish of nutrient jelly. Paper discs, for example M and N, were first soaked in different antibiotic solutions and then placed on the bacterial growth. A transparent region in the jelly shows that the bacteria there have been killed.

May/June 2017

Which statements concerning natural selection are correct?

May/June 2018

Which term refers to reproduction among the members of a species that are most suited to their environment?

May/June 2019

Which term is used for reproduction among the members of a species that are most well adapted to their environment?

May/June 2019

The diagram displays three insect varieties, C, D and E, from the same species, together with three leaf patterns, F, G and H, from the same plant species, which the insect feeds on.

May/June 2019

The photograph depicts a species of tree frog. Every tree frog in this species is coloured either grey or green.

May/June 2019

Which of these statements about natural selection are correct?

May/June 2021

Which characteristic of a cereal crop cannot be improved through selective breeding on its own?

May/June 2021

Which of the following statements about natural selection are correct?

May/June 2021

The number of weed plants in a grass field was counted every month. The results are shown in the table. From August 2020 onwards, the field was mown on a regular basis and used as a football pitch. Using this information, which two weeds are most suited to surviving in mown grass?

May/June 2022

In one population of lizards, some individuals had leg bones that were longer than those of others. These lizards could climb more effectively than the ones with shorter legs, which helped them avoid predators on the ground. As time passed, the lizards with shorter legs died out, so every lizard in the population now has longer legs. Which process has led to this change in the lizard population?

May/June 2023

In the United States of America, Lake Washington is a large lake of fresh water. From 1941 to 1963, ever larger quantities of untreated sewage contaminated the lake.

May/June 2023

As time passes, a bird species acquires a beak that is more pointed. This pointed beak enables the birds to पकड़? no English. It helps them catch small insects that may be concealed in cracks in the rocks. What is one reason for the change in the shape of the birds’ beaks?

May/June 2024

Which process is reproduction carried out by the members of a species that are most suited to their environment?

May/June 2024

Poachers hunt elephants for their tusks, because tusks provide ivory. In $1930$, at a National Park, $1\%$ of the elephants were born with no tusks. The absence of tusks was caused by a gene mutation. At present, in the same area, $15\%$ of the females and $9\%$ of the males are tuskless. Which statements could account for this rise in the number of tuskless elephants?

Oct/Nov 2019

A farmer aims to breed oranges that are extra-large and sweet by selective breeding. From the information in the table, which plant types should the farmer choose for breeding?

Oct/Nov 2020

Describe, with examples, what the term mutation means. Name factors that may increase the rate of mutation.

Oct/Nov 2020

What is one outcome of natural selection?

Oct/Nov 2021

What is one outcome of natural selection?

Oct/Nov 2021

In a garden, there is an insect species that may be red or green in colour. The green insects are very well camouflaged. Birds that feed on insects begin to live in the garden. The graph shows how the numbers of red and green insects then change. What is this an example of?

Oct/Nov 2022

As carbon dioxide concentrations in the atmosphere rise, the Earth’s climate is warming. How could this climatic change influence natural selection?

Oct/Nov 2022

What is necessary for natural selection to happen?

Oct/Nov 2024

What results might farmers hope to achieve by using artificial selection?

Oct/Nov 2024

Which row indicates possible consequences of natural selection?

Oct/Nov 2025

Three statements about natural selection are given. Which of the statements are correct?

Oct/Nov 2025