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.
Water passes across leaf tissues by different routes as a result of • differences in water potential • the pull transmitted by cohesive forces betw...
The diagram shows a transverse section of a stem. [Figure 26.1 showing a TS of a stem with regions A, B, C, D labeled] Which area is the phloem?
The diagram shows the water potential (Y) in some plant cells and in their environment. [Figure 27.1 showing three plant cells and environment with...
In mammals, some carbon dioxide is transported by red blood cells in combination with haemoglobin. What is the product of this combination?
The graph shows pressure changes during a cardiac cycle. [Figure 30.1 showing a graph of pressure vs time with points W, X, Y, Z] Which row correct...
Some babies are born with a hole between the right and left atria. These newly born babies are found to have an increased number of red blood cells...
Which row correctly shows the areas of the respiratory tract that contain cartilage, epithelium), goblet cells and smooth muscle? cartilage cilia g...
Which of the effects listed occur as a result of inhaling both carbon monoxide and nicotine from cigarette smoke? 1 increased heart rate 2 increase...
During an investigation on gas exchange, three measurements were made on four efficiency of gas exchange was the same in all four people. Which per...
The data shows how the number of human deaths caused by the bacterium Staphylococcus aureus has changed from 1997 to 2005. Methicillin is an antibi...
The diagram shows the response to a pathogen by the immune system. [Figure 38.1 showing an immune response pathway with P, Q, R, S] Which row corre...
The diagram represents part of the nitrogen cycle. [Figure 39.1 showing a nitrogen cycle diagram with processes A, B, C, D labeled] Which process i...
The diagram shows the flow of energy between organisms in an ecosystem. [Figure 40.1 showing an energy flow diagram with organisms 1, 2, 3, 4] Whic...
Where would cisternae be found in a cell? 1 endoplasmic reticulum 2 Golgi apparatus 3 mitochondrion
Ribosomes exist as separate subunits that bind together during protein synthesis. What do these subunits consist of?
Which cell components contain mRNA? 1 chloroplast 2 mitochondrion 3 nucleus 4 rough endoplasmic reticulum
The diagram shows a stage micrometer on which the small divisions are 0.1 mm. through an eyepiece containing a graticule. [Figure 5.1] The stage mi...
Which processes occur in eukaryotes and prokaryotes? 1 hydrolysis 2 mitosis 3 transcription 4 translation
High concentrations of urea break all bonds, except covalent bonds, in protein molecules. Which level of protein structure would remain unchanged w...
Two disaccharides are cellobiose and sucrose. Cellobiose is formed from two molecules of glucose, whilst sucrose is formed from fructose and glucos...
The diagram shows part of a carbohydrate molecule. [Figure 9] Which polymers could this be part of? 1 amylopectin 2 amylose 3 glycogen 4 starch
When a lake begins to freeze, which properties of water are needed for fish to survive? 1 Water has a high surface tension. 2 Water has a high lat...
In an enzyme-catalysed reaction, which combination of inhibitor and substrate would result in the highest rate of reaction? [Table 12]
Following a heart attack, the enzyme lactate dehydrogenase leaks into the blood plasma from damaged heart muscle. Which steps are required to obtai...
Red blood cells were placed in a solution of sodium chloride with a less negative water potential than the cell contents. Haemoglobin was released ...
The table shows three processes that contribute to transport across cell surface membranes. Which processes are the result of random movement of mo...
The cell surface membranes of plants adapted to cold conditions change as the weather gets colder, allowing the plants to carry out exocytosis. Whi...
Which statements about a diploid cell are correct? 1 can divide by mitosis to repair itself 2 possesses two complete sets of chromosomes 3 undergo...
Meiosis and mitosis are two types of cell division. A cell has 20 chromosomes before it divides. How many chromosomes will it have after dividing b...
The graph shows the length of the spindle fibres during mitosis. [Figure 19] Which region of the graph shows when the centromeres detach from the s...
In a genetic engineering experiment, a piece of double-stranded DNA containing 12 × 10³ nucleotides coding for specific polypeptide is transcribed ...
The diagram shows part of a DNA molecule. [Figure 22] Which row correctly identifies the structures labelled 1, 2, 3 and 4?
Bacteria were grown in a medium containing 15N. After several generations, all bacteria contained 15N. Some of these bacteria were transferred to a...
The diagram shows pressure changes in the aorta, left atrium and left ventricle during a cardiac cycle. [Figure 24] Which row explains the changes ...
Which row shows the changes in concentration in the red blood cells when carbon dioxide diffuses from respiring cells?
The following are all structural components of blood vessels. 1 collagen fibres 2 elastic fibres 3 endothelial cells 4 smooth muscle cells Which ...
Which components of blood are also present in tissue fluid?
The diagram shows a longitudinal section through transport tissue in a plant stem. [Figure 28] What are the names of the element labelled X and the...
The diagram shows the tissues of the transport system of flowering plants. [Figure 29] Where is the water potential most negative?
Which evidence supports the theory of water movement by root pressure in flowering plants? 1 When the rate of transpiration of a tree is maximum, ...
Cardiovascular disease is said to be multifactorial. What does this mean?
The first diagram shows a spirometer, which is an apparatus used to measure changes in lung volume. The cover rises during exhalation and falls dur...
Which row shows a correct location of cartilage and smooth muscle in the human gas exchange system?
Which observation would indicate a difference between the structure of the gas exchange system of a cigarette smoker and a non-smoker?
Why is passive immunity effective for only a short time?
Within an ecosystem, the top consumers in a food chain are few in number. Which statement explains this?
The diagram shows the flow of energy through a food chain. Figures are in kJ m⁻² year⁻¹. [Figure 39] What percentage of light energy is converted t...
The diagram shows part of the nitrogen cycle. [Figure 40] Which process is increased in poorly drained soil?
Which eyepiece and objective lens combination of a light microscope enables you greatest number of cells in the field of view?
What are the characteristics of a prokaryotic cell?