Cambridge & Pearson Edexcel Past Paper Questions
Browse 35,704 questions from Cambridge O-Level & A-Level and Pearson Edexcel IGCSE & IAL exams. Click any question to practice.
The diagram shows four ecological pyramids. In a food chain, grass is eaten by cows. The cows have insects living on their skin. The insects are ea...
Which row shows a disease and the organism that causes it?
What is not a result of changing the size of the holes in fishing nets?
New plants may be grown from groups of cells that are taken from other plants. The diagram shows part of plant X. From which structure will cell sa...
What is a major advantage of feeding breast milk rather than milk made up from milk powder to a baby?
On which date is a woman most likely to ovulate if the first day of menstrual loss was 1 February?
Which conditions are necessary to activate enzymes when a seed germinates? [Figure 36.1]
A recessive homozygote is crossed with a heterozygote of the same gene. What will be the phenotypes of the F₁ generation?
A child has blood group O. Which couple could be the parents of this child?
Which process is used to produce insulin commercially?
Two heterozygotes are crossed. Some of the offspring show the recessive characteristic. What is the probability that one of these offspring that sh...
The diagram shows some cells in the root of a plant that is absorbing water from the soil. How does the water potential of the cell marked 2 differ...
According to the lock and key hypothesis, which is the lock and which is the key for the enzyme lipase?
Four test-tubes are set up as shown. In which test-tube will the concentration of oxygen decrease most rapidly?
The elements, listed, are found in all living organisms. Which one is not obtained by plants from the soil?
A person tries eating a diet consisting only of lettuce leaves and water. Which condition might develop?
The table shows changes in the concentrations of blood components as the blood flows through an organ. Which organ has the blood passed through?
Which bar chart represents the amount of starch digested in the mouth, stomach and ileum of a human?
The diagram shows a tree trunk, with a ring of bark, which includes the phloem, removed. The tree will eventually die because this action cuts off ...
The diagrams show a plant in a flask of water. It is left in the light at 16°C for six hours. What explains the change in mass after six hours?
In the human circulatory system, what causes the transfer of materials from the capillaries to the tissue fluid?
The graph shows changes in the blood pressure in the left ventricle of the heart. During which period is the left atrium contracting?
The table shows the percentage composition of four samples of air. Which sample has been breathed out by a person?
The diagram illustrates changes in air pressure taking place inside the lungs during a complete cycle of breathing. Which position on the graph cor...
The diagrams show an athlete throwing a javelin. Which row describes the change in position of the right arm, and the action of the muscles involve...
Which changes will occur when a person walks from a very cold room into a hot room?
What happens in the eye when a person walks from a dark room into sunlight?
The diagram shows a section of the brain. What could be a result of damage to the part labelled X?
A person with diabetes mellitus is receiving treatment with insulin injections. The graph shows how this person's blood glucose concentration chang...
Which component of tobacco smoke may cause lung cancer?
The diagram shows some of the stages in cheese production. At which stage in the production of cheese are the bacteria added?
The diagram shows a fermenter used for the production of antibiotics. Where do air and nutrients enter, and where do antibiotics and waste leave?
The diagram shows part of a food web. What is the original source of energy for this food web?
The table shows the mean dry biomass for the organisms in a food chain. Which pyramid of biomass is correct for this food chain?
The diagram shows part of the carbon cycle. Which process causes the largest amount of carbon to be converted from one form to another?
Which area of the diagram best describes mosquitoes?
The presence of high concentrations of nitrogen-containing fertilisers in a pond can lead to the death of fish. What is the sequence of events lead...
The diagram represents gametes P and Q fusing to give cell R. Cell R then produces gametes S, T, U and V. Which statement about the numbers of chro...
How do condoms reduce the risk of HIV infection?
Which method could not be used to produce human insulin from genetically engineered bacteria?
One gene has two codominant alleles, A and A, and one recessive allele, Ag. How many different genotypes and phenotypes are possible?
Some normal fruit flies are subjected to radiation in a laboratory. As a result, they produce offspring with unusual characteristics, such as white...
What would be the genotype(s) of the offspring from a cross between two organisms with the genotype Tt?
A plant is grown in bright sunlight. The diagram shows what is seen when a cell from a leaf is placed under a microscope. After a few hours, a leaf...
The diagram represents apparatus used to investigate osmosis. Which molecules will move across the partially permeable membrane and which change wi...
Which statements are correct for all enzymes? 1 They are proteins. 2 They are secreted into the alimentary canal. 3 They speed up biochemical react...
Which signs show that a plant has been grown in soil deficient in magnesium ions?
What is a function of each of these types of plant cell?
The diagram represents a cross section of part of a leaf. How does the oxygen content of the air at X compare to normal atmospheric air, when the l...
What are the substrate and end-products of digestion by the enzyme lipase?