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Which process do living organisms use to remove excess carbon dioxide from their bodies?
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When a donkey is bred with a zebra, a zebronkey is produced. Zebronkeys are not fertile animals.
Which statement is correct?
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The diagram shows a leaf.
Use the key to identify the leaf.
1 leaf with several small leaflets .............................. go to 2
leaf with one large leaf blade .............................. go to 3
2 leaflets are broad and flat ................................... A
leaflets are narrow and hair-like ............................. B
3 leaf with a smooth edge ..................................... C
leaf with a toothed edge ....................................... D
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The diagram shows a cell from the leaf of a plant. Which part contains the highest amount of magnesium?
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What is a leaf?
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An experiment is set up as shown.
After several hours, the water turns blue.
Which process causes this colour change to take place?
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A cell has an actual length of 0.2 mm. A student wants to make a drawing of this cell so that it appears two hundred times bigger.
How long should the student draw this cell?
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What are features of osmosis? [Table_1]
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Which chemical is used to test for the presence of protein in a food sample?
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Four test-tubes were set up as shown in the table. In which test-tube would starch be broken down the fastest?
[Table_1]
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The average number of chloroplasts in four different types of cell taken from a plant is shown.
Which is a root hair cell?
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What must be increased in the diet of a person suffering from constipation?
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The diagram shows the human alimentary canal, with a string marked in metres beside it. How long is the small intestine?
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Which stage of nutrition takes place when food molecules become part of a body cell?
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The diagram shows a transverse section through a plant organ.
What is M?
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What is a description of transpiration?
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The diagram shows a cross-section through a human blood vessel.
Which type of blood vessel does the diagram show?
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The diagram shows a section through a mammalian heart.
Which part carries blood directly from the lungs?
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Which is a mechanical barrier to pathogens?
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What is the approximate percentage of oxygen in exhaled air?
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In an experiment to investigate anaerobic respiration, two bottles are set up in a warm room, as shown.
What would happen to each balloon after one day?
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The diagram represents the exchange of gases during breathing and during respiration in the body.
What is represented by X and by Y?
[Table_1]
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What is the most important function of sweating?
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What shows the order in which these structures are involved in a reflex action?
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The diagram shows a person sweating in hot weather.
What part is played by sweat glands during the process of sweating?
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Which disease is caused by bacteria?
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Where does fertilisation occur in a flowering plant?
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Which method of birth control works by preventing an egg from being released?
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Which environmental factor is not always a requirement for seed germination?
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In some plants, $H$ is the dominant allele for hairy stems and $h$ is the recessive allele for smooth stems. A pair of these plants produce 37 offspring, 18 with hairy stems and 19 with smooth stems. What are the most likely genotypes of the parents?
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The family tree shows the inheritance of the ability to smell flowers called freesias. The allele for the ability to smell freesias is dominant.
Which individual's symbol is \textit{not} correct?
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What is an example of continuous variation?
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Which pyramid of numbers has more herbivores than producers?
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The diagram shows the flow of energy along a food chain.
Which process in the rabbit will allow energy to be passed on to the fox?
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The diagram shows part of the carbon cycle.
Which two numbered arrows represent the process of respiration?
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When making commercial apple juice, the fruit is crushed to separate cells and to release the cell contents. Chemical Q is found between the cells. It holds the cells together but it makes the extracted juice cloudy.
Which process is used to produce a clear juice?
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The table shows the amount of carbon dioxide in the atmosphere in three different years.
[Table_1]
What is the most likely cause of this change?
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