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 a cross-section through a mammalian heart. [Figure: Cross-section of a mammalian heart with W and X labelled] Which chambers of t...
At a certain point in a cardiac cycle, the pressure in the right ventricle is lower than that in the right atrium and lower than that in the pulmon...
The diagram shows the pathway for the transport of carbon dioxide that occurs in red blood cells. [Figure: Diagram of CO2 transport pathway] Which ...
The diagram shows a transverse section through an artery. [Figure: Transverse section through an artery with layer X labelled] Which statement desc...
The large arteries close to the heart have a thick elastic layer in their walls. Which statements about this layer are correct? 1 helps to maintain...
Which tissues are present in the walls of a trachea and an alveolus?
The surface tension of the layer of liquid lining the alveoli tends to pull the walls inwards so alveoli could collapse. Which statements could exp...
The diagram shows some of the effects of nicotine and carbon monoxide in cigarette smoke. [Figure: Venn diagram showing overlapping effects of nico...
Which row correctly identifies the causative organism of each disease?
The following advice was given to a person travelling to a country where there had been an outbreak of an infectious disease. • cook food well and ...
What is a social factor that affects the spread of malaria?
Which are specific immune responses? 1 phagocytosis 2 production of antibodies 3 production of memory cells
Newborn babies have natural passive immunity. What is correct for this type of immunity?
The diagrams show three different types of antibody structure. [Figure: Diagrams of IgG, IgA, IgM antibody structures] Which row is correct?
Antibody molecules are proteins that show primary structure, secondary structure, tertiary structure and quaternary structure. [Figure 1.1] shows ...
Linoleic acid is an unsaturated fatty acid that is found in some triglycerides and some phospholipids. Phospholipids are components of cell membran...
Neutrase® is an enzyme that is used to hydrolyse proteins in solution. When the enzyme is mixed with a 2% protein solution the reaction mixture cha...
Meristematic tissue is found in the growing regions of plants, such as shoot tips. Meristematic cells have a similar role to stem cells in animals....
The mammalian circulatory system is described as a closed double circulation. Explain why it is called a closed and double circulation. closed d...
The DNA in the nucleus is known as nuclear DNA.
Fig. 1.1 is a photomicrograph of a low power image of part of the common sunflower, Helianthus annuus. Fig. 1.1 is a transverse section. [Figure 1.1]
Some tissues of the gas exchange system include cells that are able to produce and secrete mucins. Mucins are stored in vesicles in these cells, re...
Fig. 3.1 is a photomicrograph of human blood cells from a healthy individual who lives at sea level. The cells labelled C, D and E are white blood ...
The bacterium Vibrio cholerae is the causative organism of the infectious disease cholera. V. cholerae has structural features typical of all bacte...
Cells contain carbohydrates, proteins, lipids and nucleic acids. (a) Fig. 5.1 is a list of biological molecules, some of which are components of la...
Catalase is an enzyme that catalyses the breakdown of hydrogen peroxide, which is a waste product of cell metabolism. The reaction catalysed by cat...
Fig. 1.1 is a diagram showing the structure of a section of a DNA molecule. [Figure 1.1]
Fig. 2.1 is a photomicrograph showing a transverse section through a bronchus and the surrounding lung tissue. [Figure 2.1]
Cholera is an infectious disease caused by the bacterium Vibrio cholerae. The pathogen causes disease by disrupting the activity of the epithelial ...
Phloem sieve tube elements and xylem vessel elements are cells that are involved with the transport of substances in plants.
Fig. 5.1 is a photomicrograph of human blood cells that have been placed in a solution of sodium chloride. [Figure 5.1]
Fig. 6.1 is a diagram of a vertical section of the human heart and the associated blood vessels. [Figure 6.1]
J1 is a slide of a stained transverse section through a plant root. You are not expected to be familiar with this specimen. Use a sharp pencil for ...
Fusicoccin is a chemical that increases the sucrose concentration in phloem at the source. In this investigation you will be provided with a sample...
M1 is a slide of a stained transverse section through a plant organ. You are not expected to be familiar with this specimen.
Fig. 1.1 shows part of a cell in a growing region of a plant. [Figure 1.1]
The interpupillary distance (IPD) is the distance in millimetres between the centres of the pupils of the eyes. Fig. 2.1 shows how IPD is measured....
Some neurones in the brain produce a neurotransmitter known as dopamine. Parkinson's disease occurs when the neurones that produce dopamine die. A ...
The link reaction and Krebs cycle take place in the mitochondrion. The main stages of the link reaction and Krebs cycle are listed in Table 4.1. Th...
Researchers investigated the extent to which the founder effect and natural selection affected evolutionary change. Fig. 5.1 shows the brown anole ...
Maize, Zea mays, is an important food crop for human consumption and for feeding to animals. Two varieties of maize are MON810 and Justina. Justina...
Some people have a condition called diabetes. In type 1 diabetes the pancreas does not produce enough insulin. Fig. 7.1 shows the blood glucose con...
Table 8.1 shows the total number of plant species, the total number of insect species and the number of habitats in three areas, A, B and C. [Table...
(a) Explain what is meant by the term limiting factor and explain how knowledge of limiting factors is used to increase crop yields in glasshouses....
(a) Explain how a cholinergic synapse functions. (b) Describe how you would carry out an investigation into the effect of wavelength of light on th...
(a) Fig. 1.1 is an electron micrograph showing a cross-section of a myelinated neurone. [Figure 1.1] Name A and B. A B
Steelhead trout, Oncorhynchus mykiss, are fish that live in streams in North America. To increase the number of steelhead trout, captive breeding h...
Soybean, Glycine max, is an important food crop for human consumption and for feeding to animals. Two varieties of soybean are Vinton 81 and GTS 40...
Oculocutaneous albinism (OCA) is a type of albinism. There are many different forms of OCA. OCA1A is one form of OCA, caused by a recessive mutatio...
(a) Fig. 5.1 is a photomicrograph of part of the cortex of a kidney.