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 process involves the movement of molecules against a concentration gradient?
Many reactions in cells are dependent on enzyme activity. Which statement about enzymes is not correct?
Which changes occur in the air spaces of a green leaf on a sunny day?
Which diagram correctly links the carbohydrates made as a result of photosynthesis with their uses?
An investigation is carried out on the rate of photosynthesis in different environmental conditions. The graph shows the results. [Figure 9.1] Whic...
The diagrams show sections through a dicotyledonous root, stem and leaf. The vascular tissues are labelled using numbers 1–6. [Figure 11.1] The end...
Which nutrient deficiency causes scurvy?
Which sets of muscles contract to cause the body to breathe in?
Which processes use energy obtained from respiration? 1 contraction of intercostal muscles during breathing 2 nitrate ions entering a root hair cel...
During vigorous exercise, lactic acid builds up in the muscles. Blood leaving these muscles will have a high concentration of lactic acid. Which pr...
The table shows the mean rate of blood flow through some blood vessels. [Table 16.1] Which row correctly identifies the blood vessels?
What happens during blood clotting?
Which statement explains the association between smoking tobacco and emphysema?
What prevents pathogens from entering the human body?
A doctor obtains some bacteria from an infected patient. The bacteria are grown in a Petri dish containing nutrient agar jelly. The bacteria produc...
The table shows the concentration of five substances in the blood entering the kidney, in fluid entering the nephron and in the urine. [Table 21.1]...
The graph shows blood glucose concentration over 6 hours in a day. [Figure 22.1] What is the set point for blood glucose concentration shown by thi...
Which hormone can be used to treat Type 1 diabetes?
An athlete's resting body temperature is 37.0 °C. After vigorous exercise for 30 minutes, the athlete's body temperature rises to 38.6 °C. The athl...
Which endocrine gland produces follicle-stimulating hormone?
The diagram shows a plant grown on its side without light. [Figure 26.1] Which row explains the responses shown by the roots and the shoot?
The tips of growing shoots of a plant are cut off and placed on small blocks of jelly which contain no auxin. Small pieces of impermeable clear gla...
Which part of the flower develops into a fruit?
Which row shows possible effects of natural selection?
All organisms in the same species show variation. Some features of different types of variation are listed. 1 an example is body mass 2 has a limit...
Bacteria reproduce by splitting into two. This can happen every 20 minutes in ideal conditions of sufficient water, food and at a warm temperature....
What could be an advantage of genetically modifying crop plants?
An investigation is done to find out how effective different biological washing powders are at digesting protein. Four equal-sized cubes of cooked ...
Which enzyme is added to fruit to aid juice production?
The diagram shows a food web. [Figure 37.1] Which organisms in this food web are primary consumers?
The processes listed occur in living organisms in a food chain. 1 excretion 2 photosynthesis 3 respiration Which processes would result in a loss o...
Trees in a forest need a constant supply of nitrates to continue growing. The diagram shows some of the stages of the nitrogen cycle that provide t...
What is a method of conserving fish stocks?
A student has drawn a cell structure as seen using a light microscope. The magnification of the drawing is ×600. The length of the structure on the...
The electron micrograph shows part of a eukaryotic cell. Which of the labelled organelles is a site of protein synthesis? [Figure 2.1]
Inside a cell, a damaged mitochondrion can be surrounded and enclosed by a membrane to form a vesicle. What happens after the fusion of a lysosome ...
Which units are the most appropriate to record the diameter of a lymphocyte and a red blood cell? [Figure 4.1]
Which structures will be present in a cell that causes cholera? 1 circular DNA 2 naked DNA 3 70S ribosomes
What may take place during a hydrolysis reaction? 1 a molecule of water is produced 2 a glycosidic bond is broken 3 a sucrose molecule is split int...
The table shows some information about four carbohydrate polymers. Which two polymers form starch? [Figure 7.1]
Which molecule in the key is sucrose? [Figure 8.1]
Which statements about triglycerides and phospholipids are correct? 1 Triglycerides and phospholipids both have a hydrophobic region. 2 Triglycerid...
When proteins are mixed with some organic solvents, hydrophobic interactions and hydrogen bonding are changed in the protein molecules. Which level...
The rate of enzyme-catalysed reactions in human cells is regulated. What may be involved in such regulation? 1 a change in enzyme concentration 2 a...
The graphs show the effects of temperature and pH on enzyme activity. Which statement is a correct explanation of the enzyme activity? [Figure 12.1]
Which statement correctly describes the action of competitive enzyme inhibitors?
Which row correctly links molecules in the cell surface membrane with their roles? [Figure 14.1]
Antimycin is a chemical that inhibits the function of mitochondria. Which methods of transport across the cell surface membrane would be inhibited ...
Which statements about the cell cycle are correct? 1 The cell cycle consists of both interphase and mitosis. 2 DNA replication takes place in inter...
The diagram shows cells in different stages of the cell cycle. Which is the last stage before cytokinesis? [Figure 17.1]