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.
Four types of cell found in the leaf of a green plant are listed below. 1 epidermal cells (not including guard cells) 2 guard cells 3 palisade meso...
Which statements about osmosis are correct? 1 Glucose molecules can move by osmosis. 2 Molecules pass through a partially permeable membrane. 3 Mol...
A seedling is placed, with its roots, in a solution containing potassium ions and left for 48 hours. The relative concentrations of the potassium i...
Enzyme action can be explained by the lock and key hypothesis. Where is the active site and does the substrate act as the lock or as the key?
Some organisms live at the bottom of the sea where it is very dark. To synthesise glucose, they use energy from chemicals in the very hot water tha...
Which graph shows the effect of temperature on the rate of oxygen released by an aquatic plant when placed in strong light?
The diagram represents a cross-section of part of a leaf. [Figure showing a cross-section of a leaf with 'X' pointing to an air space] How does the...
What is the main function of the colon?
What is least likely to increase the transpiration rate in a plant?
The diagram shows part of a tree trunk. A ring of bark including the phloem has been removed. [Figure showing a tree trunk with a ring of bark remo...
Which of these organs will receive blood from both an artery and a vein?
The diagram shows a section through the human heart. [Figure showing a section through the human heart with labels P, Q, R, S, T, U] Which suggests...
The diagram shows chemicals being exchanged between some cells and a blood capillary. [Figure showing a blood capillary with chemicals P moving out...
How many molecules of lactic acid will be produced by the breakdown of two molecules of glucose in anaerobic respiration?
Which process does not require energy from respiration?
By which route does oxygen pass into the blood?
Which organ excretes most carbon dioxide from the human body?
What happens to the ciliary muscle and what happens to the lens when the eye focuses on a distant object?
Which statement about brain structure and function is not correct?
What is not an example of a simple reflex action?
Which row shows the type of joint and the type of movement permitted at a joint in the forelimb?
The graph shows the death rates from liver disease in two different countries. [Figure showing a bar graph of death rates per 100 000 of population...
Which statement is correct for all viruses but not for all bacteria and fungi?
The graph shows how the rate of penicillin production from the fungus Penicillium varies with temperature at two different oxygen concentrations. [...
Which organisms always obtain their energy from dead organic matter?
The diagram shows part of a food web. [Figure showing a food web with eagles, foxes, badgers, ladybirds, thrushes, hedgehogs, aphids, caterpillars,...
Draining stagnant water is one method of controlling the malarial mosquito. Which stages in the mosquito life cycle does this method destroy?
In recent years, important rivers in many parts of the world have become more acidic. What has caused this change?
The diagram shows a section through a flower. [Figure showing a section through a flower with labels W, X, Y, Z] What are the names of the labelled...
Some seeds are sown in four dishes under different conditions as shown in the table. In which dish will the seeds germinate most rapidly?
Which row shows a disease and the pathogen that causes it?
The graph shows the concentration of a hormone in the blood during one menstrual cycle. [Figure showing a graph of concentration of hormone in the ...
What is the primary function of DNA?
In the ABO blood group system, which genotype is homozygous dominant?
In a species of plant, the allele for yellow flowers is dominant to the allele for white flowers. Which offspring is it possible to produce from a ...
A cell is observed under a microscope. Which feature identifies it as a plant cell?
The diagram shows a root hair cell and surrounding soil particles. [Figure 3.1] Osmosis occurs when regions of higher and lower concentration of wa...
What are enzymes?
An experiment is set up as shown. The volume of gas collected is measured after 30 minutes. [Figure 6.1] The experiment is repeated several times. ...
The diagram represents a cross-section of part of a leaf. [Figure 7.1] How does the oxygen content of the air at X compare to normal atmospheric ai...
What are the smaller basic units that make up glycogen and protein?
Which pathway provides humans with the most fibre (roughage) in the diet?
A gland secretes different types of enzymes into part of the alimentary canal which allows digestion of proteins and starch. It also receives alkal...
What is not a function of transpiration?
The diagram shows a section through the human heart. [Figure 14.1] Which suggests that blood leaves the heart at different pressures, when going to...
The diagram shows chemicals being exchanged between some cells and a blood capillary. [Figure 15.1] What could be the identities of chemicals P and Q?
How does anaerobic respiration in muscle cells cause a reduction in blood pH?
Which row shows the events that occur to cause air to flow into the lungs?
Why is it important that the lungs remove carbon dioxide from the body?
The diagrams show the eye viewed from the front and its lens in cross-section. [Figure 21.1] Which diagrams show the appearance of the pupil and th...