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.
Some organisms live at the bottom of the seas where it is very dark. To synthesise glucose, they use energy from chemicals in the very hot water th...
The diagram shows cells in a section through a leaf of a typical green plant. (No cell contents are shown.) [Figure 7.1] Which cells usually contai...
The element nitrogen is needed to form
Which process involves the use of nutrients inside cells?
Five tubes containing cooked egg-white are set up as shown. Protease solutions of different pH are added to each tube. [Figure 10.1] Which diagram ...
Under which set of conditions will the transpiration rate of a well-watered plant be fastest?
A plant was placed in water containing black dye. After 24 hours the plant was removed and sections were taken from the root and the stem. [Figure ...
The diagram represents the heart and some major blood vessels. [Figure 13.1] What are possible blood pressures (in kPa) for the vessels shown on th...
The diagram shows changes in pressure in the aorta and the left ventricle during one complete heart beat. [Figure 14.1] What causes the increase in...
The diagram shows the liver and its blood supply. [Figure 15.1] What is the name of blood vessel X, and which substance increases in concentration ...
In the equations that follow, ☐ represents energy or an energy-rich compound. Which equation best represents aerobic respiration?
The diagram shows the rib cage and some of the muscles involved in breathing as seen from the side. [Figure 17.1] What happens when the intercostal...
The diagram shows a section of an alveolus and a capillary in a lung. [Figure 18.1] What are the relative concentrations of carbon dioxide at X, Y ...
Where are most nitrogen compounds excreted from humans?
When the temperature of the air is higher than body temperature, which of these control mechanisms can help to maintain a constant body temperature?
A motor neurone transmits impulses from
In which order does light pass through these structures in the eye?
Why is glucose found in the urine of diabetics?
Which bones form a joint at the shoulder?
Which facts about alcohol are correct?
In a practical lesson, a student makes the following observations about some organisms. 'They are spherical, unicellular organisms which are visibl...
The fungus Penicillium is grown in fermenters to make penicillin. The table shows the time taken for the mycelium of the fungus to double in size w...
Which sequence describes the flow of energy in an ecosystem?
The diagram shows a food web. [Figure 29.1] What is likely to happen to the owl population if foxes die out?
Which organisms convert ammonium compounds to nitrates?
The malarial parasite can be transferred from mosquitoes to humans when
The graph shows the concentration of dissolved oxygen at different points along a river. [Figure 32.1] At which point is sewage emptied into the ri...
What describes the chromosome number of these human cells?
A plant has flowers whose anthers mature and fall off before the stigma is fully developed. What will this prevent?
Which diseases can be cured with antibiotics?
Which row correctly shows an advantage of feeding babies breast milk and an advantage of feeding them bottle milk?
A red-flowered plant is crossed with a white-flowered plant. All the offspring have red flowers. What is the genotype of these offspring?
A person with Down's syndrome is born with 47 chromosomes in each cell, instead of 46. What could cause this?
The diagram shows a species becoming modified to survive in two different habitats. [Figure 40.1] Which process is responsible for these modificati...
The diagram shows a plant cell. [Diagram] Which structure identifies this as a plant cell rather than an animal cell?
The diagram shows a plant cell. [Diagram] Compared with the rest of the cell, which row describes the concentrations of oxygen and magnesium inside...
A plant has leaves that are green in the centre but white around the edges. The plant is destarched and then has one of its leaves partly covered w...
What is an example of assimilation?
What are the basic units from which glycogen is synthesised?
A food is known to contain protein, but no reducing sugar. When this food is tested with biuret solution and Benedict's solution which colours woul...
The diagrams show transverse sections of a plant stem and of a plant root. [Diagram] Which regions contain xylem vessels?
In an experiment to investigate transpiration, the leaves of four identical shoots are treated as follows. 1 upper surfaces covered with waterproof...
The diagram represents the heart and some major blood vessels. [Diagram] What are possible blood pressures (in kPa) for the vessels shown on the di...
The diagram shows the liver and its blood supply. [Diagram] What is the name of blood vessel X, and which substance increases in concentration betw...
Which word equation shows anaerobic respiration in yeast?
The table shows the effect of exercise on the rate and depth of breathing. What is the increase in the volume of air exchanged per minute after exe...
The diagram shows a section of an alveolus and a capillary in a lung. [Diagram] What are the relative concentrations of carbon dioxide at X, Y and Z?
The diagram represents a kidney machine. [Diagram] Which two substances are both present in the dialysis fluid entering the machine?
The diagram shows some of the structures in human skin. [Diagram] Which labels describe the structures Y and Z in hot conditions?
What are characteristics of all neurones?