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Which process occurs both in plants and in animals?
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Some statements about species are given. 1. Members of a species all look identical. 2. Members of a species belong to the same genus. 3. Members of a species can produce fertile offspring. 4. Species are named using an international system. Which statements are correct?
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Which structures are found in the cells of all living organisms?
1. Cell membrane
2. Chloroplast
3. Cytoplasm
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In the diagram of the palisade cell, the distance between X and Y is 20 mm. The actual width of the cell between X and Y is 40 \mu m. What is the magnification of the diagram?
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The diagram shows a root hair cell.
When does water enter the cell by osmosis?
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Which row shows the changes that occur during the germination of a seed? [Table_1]
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The diagram shows the human alimentary canal. In which structure is most glucose absorbed into the blood?
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DNA contains pairs of bases. Which pair shows a correct combination of bases?
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In which region of the alimentary canal is maltose digested?
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The graphs show the effect of temperature on enzyme activity. This enzyme has an optimum temperature of 30 °C.
Which graph shows the effect of temperature on the activity of this enzyme?
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The diagram shows a leaf on a plant used in a photosynthesis experiment. At the start of the experiment, there is no starch in the leaf. A piece of black paper is attached to the upper surface of the leaf. The plant is placed in bright light for 12 hours. Four discs are then cut from the leaf in the positions shown on the diagram. The discs are tested for starch. Which disc contains starch?
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The graph shows the effect of temperature on the rate of photosynthesis.
Which statement explains the change in rate of photosynthesis between 15°C and 20°C?
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The lack of which component of a balanced diet will lead to the development of scurvy?
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Which structure is the duodenum?
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Humidity and wind speed are two factors that affect the rate of transpiration. How do these two factors affect the concentration gradient of water molecules between the inside of the leaf and the outside atmosphere? [Table_1]
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During an investigation into the movement of substances in a plant, a ring of tissue containing the outer part of the transport tissue is removed, as shown.
Which statement explains why a swelling develops in the stem?
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The diagram shows the human heart.
Which label shows the left ventricle?
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Which row shows the features of an artery or a vein? [Table_1]
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Cholera bacteria in the gut cause secretion of chloride ions which leads to diarrhoea. Which diagram shows the correct movement of chloride ions (Cl^-) and water (H2O)?
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Different stages in the process of expiration are listed.
1. Rib cage moves downwards and inwards.
2. Volume of thorax decreases and pressure in lungs increases.
3. Air is pushed out of lungs.
4. Diaphragm and external intercostal muscles relax.
What is the correct order of these stages?
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Which row shows aerobic respiration?\n[Table_1] substrates | products \nA \( 6\text{CO}_2 + 6\text{H}_2\text{O} \) | \( \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \) \nB \( \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{CO}_2 \) | \( 6\text{H}_2\text{O} + 6\text{O}_2 \) \nC \( 6\text{CO}_2 + 6\text{O}_2 \) | \( \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{H}_2\text{O} \) \nD \( \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \) | \( 6\text{CO}_2 + 6\text{H}_2\text{O} \)
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In which organ is lactic acid respired aerobically to remove an oxygen debt?
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The diagram shows a cross-section of a kidney. What are the correct names for structures P, Q, and R?
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Which statement describes what happens during the transmission of an electrical impulse along a reflex arc?
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During the pupil reflex in bright light, what describes the actions of the muscles in the iris?
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Which distribution of auxin will cause the shoot tip to grow towards the light?
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What is an advantage of asexual reproduction in a wild population?
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The diagram shows the structure of part of a flower. The arrow represents the transfer of pollen. Which statement about the arrow is correct?
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In a sperm cell, which structure contains enzymes that can digest the jelly coat of an egg cell?
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The following are involved in protein synthesis.
1. amino acids assembled in order
2. mRNA moves to the cytoplasm
3. mRNA passing through a ribosome
4. DNA in the nucleus
In which order do they become involved when proteins are made?
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A man of genotype $I^A I^o$ and woman of genotype $I^B I^o$ have a child. What is the chance that the child will have the same blood group as one of its parents?
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A man who has red-green colour blindness has a child with a woman who does not have red-green colour blindness. The child has red-green colour blindness. The man and woman decide to have another child. What is the percentage probability that their next child will have red-green colour blindness?
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Which types of variation can be inherited? [Table_1]
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Which feature is a leaf adaptation for living in a hot, dry desert?
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Which term is used to describe an organism that makes its own organic nutrients?
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The diagram shows two pyramids based on food chains in which the producer is a large tree. What do the two pyramids represent?
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What is a negative impact on the environment caused by deforestation?
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The diagram shows the positions of four farms and the concentrations of nitrate at different points in a river. Which farm is likely to have been using too much fertiliser on its land?
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The diagram shows a bacterial cell containing a plasmid. What is inserted into the plasmid if this cell is to be used for the production of insulin?
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Yeast carries out anaerobic respiration, making carbon dioxide and ethanol as end-products.
Which end-products can be used to make biofuel and bread?
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