Select one answer for each question. This version contains questions 1–30 only.
Which characteristic of living things is described as the removal of toxic materials and substances in excess of requirements?
The photographs show some onion cells before and after being placed in a concentrated solution of glucose. What explains the appearance of the onion cells after placing them into the concentrated solution of glucose?
Three food tests are carried out on a sample of food. The results are shown. Benedict’s: blue; biuret: blue; iodine: blue-black. From these results, which nutrient is in the food?
One method of preventing food spoilage is to store it at 4 °C in a refrigerator. Why does storing food at low temperatures help to prevent food spoilage?
The diagram shows a plan of the cross-section of a dicotyledonous leaf. What is the name of the part labelled P?
What is the dietary importance of fibre?
Selexipag is a drug used to treat a condition where the blood pressure going to the lungs is too high. The drug works by widening the blood vessel leading to the lungs to reduce the pressure. Which blood vessel going to the lungs is selexipag widening?
The list shows some processes that occur in the body. 1 cell division; 2 oxygen diffusion; 3 protein synthesis; 4 temperature regulation. Which processes use energy released by respiration?
In which order does an impulse pass along neurones during a reflex action?
Before fertilisation in flowering plants, which structure must the pollen nucleus pass through to reach the nucleus in the ovule?
Albinism is a genetic condition which results in an absence of pigment in the skin, hair and eyes. If two black mice produce an albino offspring, which Punnett square shows the correct cross?
What is the correct order for the food chain from the information given? Beetles are herbivores; mice eat the beetles; owls are the tertiary consumers; the leaves of a plant are the producer.
The diagram shows part of the carbon cycle. Which process does X represent?
A student adds 5 g of magnesium ribbon to 20 cm³ of dilute hydrochloric acid in a beaker. The student measures how long it takes for the effervescence to stop. Which pieces of apparatus does the student use in this experiment?
Sea water is a mixture that contains sodium chloride dissolved in water. Which row describes sea water?
What is the dot-and-cross diagram for a water molecule?
The electronic structures of carbon and of hydrogen are shown. What is the formula of a compound formed between carbon and hydrogen?
Which elements are formed at the electrodes during the electrolysis of concentrated aqueous sodium chloride?
Four different substances are added to the same acid of the same concentration in reactions W, X, Y and Z. The initial temperature of the acid before each reaction is 21 °C. The final temperatures are W: 28 °C, X: 19 °C, Y: 26 °C, Z: 17 °C. Which row is correct?
Dilute hydrochloric acid reacts with solid calcium carbonate. Which change decreases the rate of the reaction?
Which statement about oxidation is correct?
Which substance is classified as an acidic oxide?
The results of two tests on compound P are shown. Flame test: red flame. Addition of acidified silver nitrate: white precipitate. What is P?
What is not a property of transition elements?
What is the order of reactivity of metals, from highest to lowest?
A colourless liquid is tested with blue cobalt(II) chloride paper. The blue paper turns pink. What does this test prove that the liquid contains?
What are the products of the complete combustion of ethanol?
A person runs 5000 m in 1200 s and then walks a further 3000 m in 1800 s. What is their average speed for this journey?
The diagram shows the two forces acting on a skydiver. What is the resultant force on the skydiver?
When a ball is kicked vertically upwards, its initial kinetic energy is 12 J. When the ball arrives back at its starting point, its kinetic energy is 8.0 J. Which statement explains the change in the kinetic energy of the ball?