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.
Which combination of features is characteristic of a phloem sieve tube element as it unloads into a sink? [Table 28.1]
Which statements correctly describe transport pathways in dicotyledonous plants? 1 In the symplast pathway, water may move through intercellular sp...
The diagrams show transverse sections of parts of a plant. Which labelled structures transport mineral ions? [Figure 30.1]
Which feature of transport in plants is correct for both xylem and phloem?
What is the main function of a companion cell in phloem tissue?
The contraction of the heart is coordinated through electrical impulses passing through the cardiac muscle. What is the correct order of part of th...
As blood flows from an artery to a vein, the thickness of the walls of the vessels changes. Which bar chart shows these changes correctly? [Figure ...
The graph shows the oxygen dissociation curves of haemoglobin from two species of mammal, S and T. Which statements could explain the difference in...
Which tissues may be found in bronchioles?
Which of these statements could describe the effect of carbon monoxide in cigarette smoke? 1 It binds irreversibly to haemoglobin. 2 It causes mucu...
The global mortality figures for some diseases in 2002 are shown in the table. How many millions of people died from viral diseases listed in the t...
Which of the statements could describe both B-lymphocytes and T-lymphocytes? 1 They contain specific protein receptors in their cell surface membra...
Two people, G and H, were each given an injection to protect them against a particular pathogen. One person was injected with antibodies. The other...
A diagram of a chromosome from a dividing cell is shown in Fig. 1.1. [Figure 1.1]
The infectious disease cholera is caused by a bacterium. (a) Fig. 2.1 shows a transmission electron micrograph of this bacterium. ×30 000 [Figure 2.1]
Catalase is an enzyme that catalyses the breakdown of hydrogen peroxide, a toxic waste product of metabolism. 2H2O2 catalase 2H2O + O2 Fig. 3.1 sho...
The transport systems of plants and mammals both function to transport substances to and from cells. (a) Table 4.1 contains descriptions concerning...
(a) Smooth muscle and cartilage are two of the tissues found in the walls of structures of the gas exchange system of mammals. Complete Fig. 5.1 to...
(a) A student investigated the effect of changing the surface area to volume ratio on diffusion. • Two different-sized blocks of agar, X and Y, wer...
Enzyme E hydrolyses (breaks down) starch to reducing sugar. You are required to investigate the effect of temperature (independent variable) on the...
P1 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 ...
Section A Answer all the questions. (a) Fig. 1.1 shows diagrams of nephrons from the kidneys of three different mammals, P, Q and R. These are all ...
(a) During a sporting event, an athlete carries out respiration in aerobic conditions.
One example of chemical control and co-ordination in plants is in the breakdown of food reserves during the germination of cereal grains, such as w...
(a) An investigation was carried out to measure the rate of photosynthesis at different concentrations of carbon dioxide. Two different plants, bar...
The foxglove, Digitalis purpurea, is a common plant in many parts of the world. Fig. 5.1 shows a foxglove. [Figure 5.1] Flower colour in foxgloves ...
The Hardy-Weinberg principle may be used to calculate allele and genotype frequencies for a gene, within a population. The Hardy-Weinberg principle...
(a) Most reflex arcs pass through the spinal cord and involve different types of neurones. Name and state the functions of the three types of neuro...
Palm oil is an edible vegetable oil that comes from the fruit of oil palm trees. • Palm oil is cheap. • It is the world's most widely used vegetabl...
Section B Answer one question. (a) Explain what is meant by the terms ecosystem and niche.
Section B Answer one question. (a) Describe the principles of the polymerase chain reaction (PCR).
(a) A group of students investigated the effects of glucose and ATP on the contraction of muscle fibres. Muscle tissue was cut into pieces along th...
Melanism (dark-coloured wings) in a species of moth is controlled by a gene with two alleles. The dominant allele codes for the melanic form and th...
The eyepiece lens of a microscope can be fitted with an eyepiece graticule. Which of these statements about eyepiece graticules are correct? 1 They...
A student was asked to use the scale bar shown to calculate the magnification of a cell on a photomicrograph. [Figure showing a scale bar: 2 μm] Wh...
Which eyepiece and objective lens combination of a light microscope allows the greatest number of cells in a field of view to be seen? [Table showi...
Which row correctly matches each cell structure with its function? [Table matching microtubules and rough endoplasmic reticulum with functions]
Which animal cells would have the most extensive Golgi bodies?
Which of these processes will require ATP? 1 transport of water in the xylem 2 semi-conservative replication of DNA 3 facilitated diffusion of amin...
Which concentrations could be produced by a serial dilution of an 8.00% glucose solution?
A student wrote these statements about polysaccharides. 1 Amylose is formed from condensation reactions between β-glucose monomers. 2 Branches in a...
Which diagram correctly shows the formation of a peptide bond between two amino acids?
Sugars with a ring structure can also have a linear structure. Which sugar molecules could be represented by the linear structure shown in the diag...
Which molecules are globular proteins? 1 amylase 2 haemoglobin 3 DNA polymerase
When hydrolysed, which molecules have products containing a carboxyl group? 1 phospholipids 2 polysaccharides 3 proteins
Lysosomes contain many different hydrolytic enzymes that may act within cells (intracellular enzymes) or outside cells (extracellular enzymes). Whi...
The diagram shows an enzyme, its substrate and an enzyme/substrate complex. [Figure showing enzyme, substrate, and enzyme/substrate complex] Which ...
What could be used to calculate the rate of an enzyme-catalysed reaction? 1 the appearance of product 2 the disappearance of substrate 3 the Michae...
Cholesterol is an integral component of the cell surface membrane. Which statement about cholesterol is correct?
Which type of bond in phospholipids has a role in increasing the fluidity of cell surface membranes?