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 statements about cancer are correct? 1 Exposure to UV light from the sun always causes skin cancer. 2 Some viruses can cause cancer. 3 The mu...
The diagram represents the life cycle of a sexually reproducing animal. [Figure 18.1] Which row correctly identifies meiosis and mitosis?
Which feature of a plant cell is an adaptation for water uptake from the soil solution?
A student used a potometer to measure the rate of water loss from a plant by transpiration. The internal diameter of the capillary tube and the dis...
Which feature of xylem vessel elements helps the cohesion of water?
What determines the rate of water movement from the roots to the leaves?
The graph represents data on blood vessels and blood flow. [Figure 27.1] Which row correctly identifies the curves?
What occurs during ventricular systole in a mammalian heart? 1 aortic pressure increases 2 atrial pressure does not change 3 ventricular pressure i...
The diagram shows a defect in the walls between the atria. [Figure 29.1] What effect would this defect have on the blood circulatory system?
Which will not be formed in the plasma in capillaries surrounding active tissue?
Goblet cells are found in the trachea. Which organelles would be found in large numbers in a goblet cell? 1 lysosomes 2 mitochondria 3 rough endopl...
Which tissues are present in a bronchus? [Figure 32.1]
Which statements are correct effects of tar in tobacco smoke on the human gas exchange system? [Figure 33.1]
The diagram shows the relationship between cholera, measles and TB. [Figure 34.1] Which is correct?
New-born babies have natural passive immunity. What is the correct explanation for this? [Figure 35.1]
Which is a correct description of different types of immunity? [Figure 36.1]
The World Health Organization (WHO) set a target to eradicate polio, using vaccines, by the year 2000. However, cases are still being reported in s...
The graph shows the annual changes of the following factors in a lake. intensity of light per day numbers of producers numbers of primary consumers...
Which events can occur in the nitrogen cycle? 1 Inorganic nitrogen in the atmosphere undergoes denitrification by specific prokaryotes. 2 Nitrate c...
Two different ecosystems of the same size, X and Y, were compared. Both ecosystems were in the same climate. The results of the comparison are show...
Which combination of lenses for a light microscope will give the greatest magnification?
Which steps are needed to find the actual width of a xylem vessel viewed in transverse section using a ×10 objective lens? 1 Convert from mm to µm ...
The statements are all descriptions of cell structures. 1 surrounded by a single membrane and enclosing a large fluid-filled space 2 surrounded by ...
Which structures are found in both typical eukaryotic cells and typical prokaryotic cells? 1 70S ribosomes 2 80S ribosomes 3 circular DNA
Which sequence shows some of the stages in the production and secretion of an enzyme?
Which plan diagram of a transverse section of a dicotyledonous leaf correctly shows the position of xylem and phloem in a palisade mesophyll layer ...
Proteases are a group of enzymes that digest proteins. Which statement about proteases is correct?
Two disaccharides are maltose and sucrose. Maltose is formed from two molecules of glucose whilst sucrose is formed from fructose and glucose. Whic...
The diagram shows a carbohydrate molecule. [Figure 9] Of which polymers could this be a part?
Which of the bonds stabilising the tertiary structure of a protein would be least likely to break when the temperature is increased above the optim...
The diagram shows the structure of four amino acids in solution. [Figure 11] Which amino acids have no overall charge?
The statements are about the properties of water. 1 It requires a lot of heat to evaporate. 2 It retains a lot of heat. 3 It is able to form hydrog...
Which words from the table correctly complete the paragraph about enzymes? When the pH of an environment is decreased below an enzyme's optimum pH,...
Lipase is a digestive enzyme produced by the pancreas that catalyses the hydrolysis of dietary lipids. The table shows how the pH of a liquid food ...
The AIDS virus produces a long polypeptide that is hydrolysed by a protease enzyme to several smaller peptides. This viral protease is the target o...
What is the width of the cell surface membrane?
Some functions of molecules found in cell surface membranes are listed. 1 cell recognition 2 ion transport 3 maintaining fluidity 4 mechanical stab...
The enzyme lactase is found in the membranes of epithelial cells lining the small intestine. The enzyme is formed by a single polypeptide that fold...
A student examined the cells in the growing region (meristem) of an onion root and recorded the data below. [Figure 19] What percentage of cells co...
Which definitions of diploid and haploid are true for typical eukaryotic cells? 1 diploid – any cell with an even number of homologous chromosomes ...
Which type of sugar and types of bonds are found in a DNA molecule?
Which nucleic acid bases are purines?
A short piece of DNA 15 base pairs long was analysed to find the number of nucleotides in each of the polynucleotide strands. Some of the results a...
The diagram shows a transverse section of a stem. [Figure 24] Which area is the phloem?
A leafy shoot was attached to a potometer and exposed to a variety of conditions. The time taken for the meniscus to move 50 mm along the capillary...
The diagram shows four plant cells. [Figure 26] In which direction could there be net movement of water by osmosis?
How will the root pressure in a plant be affected by waterlogged soil?
Small arteries (arterioles) are found near tissues. One function of an arteriole is to increase or decrease the flow of blood to the tissues. Which...
The graph shows a dissociation curve for haemoglobin. [Figure 30] Which are suitable labels for the x-axis and the y-axis?
One type of congenital heart defect is called atrial septal defect (ASD) where the left and right atria are not completely separated. ASD usually r...