AQA GCSE Biology paper 2 higher tier questions and answers

AQA GCSE Biology paper 2 higher tier -
June 2022 ( mark scheme answers)
Complete table 1 to compare sexual reproduction with asexual reproduction.
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Write a tick in the box if the statement is true.
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The first row has been completed for you. - Correct Answer - Sexual reproduction
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-cell division occurs
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-fertilisation occurs e




asexual reproduction e




-cell division occurs
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-genes are passed on from parent to offspring
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-offspring are genetically identical to each other
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Students investigated the population of earthworms in the soil in two different areas.
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-Area A: a grass lawn
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-Area B: a farmer's field
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Chemical X can be mixed with water and poured onto the soil.
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The mixture beings earthworms to the surface of the soil but does not harm the earthworms.
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Plan an investigation using chemical X to compare the number of earthworms per m^2 in areas A and B. -
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Correct Answer - -Same concentration of chemical applied to the soil
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-Same volume of chemical applied to the soil
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-Same size of area sampled e.g. 1m^2 or 0.25m^2
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-Use of quadrat
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-Same time between application and collecting worms
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-Same time allowed for collecting worm after application
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-Each sample area selected randomly
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-Method achieving randomness e.g. random coordinates
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, -Count worms in each of the areas A and B
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-At least 5 repeats in each of the areas A and B
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-Calculate mean e




-Compare means e




Explain the effect of a high concentration of insulin has on blood glucose concentration. - Correct Answer -
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Effect: lowered
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Explanation: Glucose is taken in by cells e e e e e e




Table 2 shows: e e e




-the results of the blood test
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-the mean results for people who do not have diabetes
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Type 2 diabetes occurs when body cells have a reduced response to insulin.
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Give two ways the results of the blood test show that person C might have Type 2 diabetes. -
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Correct Answer - high concentration of insulin
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high glucose e




Give two ways that a person can reduce the chance of developing type 2 diabetes - Correct Answer -
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more exercise
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eat a low carbohydrate diet
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Name three harmful substances that could cause water pollution
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Do not refer to plastic or to litter in your answer - Correct Answer - Fertiliser
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Sewage

herbicide

Describe how substances that pollute air and water could be harmful to humans and other living organisms
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- Correct Answer - Air pollution
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- Sulfur dioxide causes damage to leaves so less photosynthesis take place.
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-damage to roots or alters ions in soil so less protein is made.
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- damage to lungs which can lead to breathing difficulties.
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-Carbon monoxide combines with haemoglobin so less oxygen is carried.
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-Particulates blocks light leading to less photosynthesis taking place and less glucose being made
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