AQA · GCSE · Biology

Homeostasis and response

06.5 · 2 marks Controlling reaction-time investigations Control variables between the different people in the investigation included age, sex, and food and drink consumed before and... 04.1 · 2 marks Hormonal control of metabolic rate When rats compete, the basal metabolic rate of the rats increases. Basal metabolic rate is controlled in the same way in humans... 06.2 · 1 mark Adrenaline and the fight-or-flight response Adrenaline can increase blood glucose concentration. What is one other effect of adrenaline? Tick one box.

AQA · GCSE · Biology

Ecology

01.1 · 1 mark Marine food chain ordering Limpets eat algae. Limpets are prey for crabs. Give the food chain for algae, crabs and limpets. 01.2 · 2 marks Quadrat area unit conversion Calculate the area of the quadrat in m². 01.3 · 2 marks Scaling a quadrat sample The total area of the sea shore was 1800 m². The students sampled 2% of the total area of the sea shore. Calculate the number of... 01.4 · 2 marks Bias from thrown quadrats Explain why throwing a quadrat is not a random method to estimate population size. Do not refer to safety in your answer. 01.5 · 2 marks Random quadrat placement method Describe one method the students could use to plan where the quadrat should be randomly placed each time. 01.6 · 1 mark Sea-shore fieldwork hazards Suggest one hazard the students should be aware of when collecting data on the sea shore. Do not refer to throwing quadrats in... 01.7 · 1 mark Water pollution affecting limpets Populations of limpets are monitored to assess the impact of pollution in water. Suggest one type of pollution in water that may... 05.1 · 1 mark Living and non-living ecosystem interactions Define the term ‘ecosystem’. 05.2 · 2 marks Animal roles in stable communities Otters are an important species for the stability of the river community. Describe two ways animal species may be important for... 05.3 · 1 mark Comparing bacterial population values The number of bacteria at 5.0 km was greater than the number of bacteria where the sewage was added. Calculate how many times... 05.4 · 2 marks Testing proportional relationships in data A student concluded: ‘number of bacteria ∝ concentration of dissolved oxygen’. Explain why the student’s conclusion is not... 05.5 · 3 marks Dissolved oxygen and otter populations Otters live in water and on the land and eat mainly fish. The concentration of dissolved oxygen has decreased in a river where...

AQA · GCSE · Biology

Inheritance, variation and evolution

02.2 · 1 mark Features of asexual reproduction Which statement is true for asexual reproduction? Tick one box. 02.3 · 1 mark Chromosome number in gametes How is a gamete different from other cells in a potato plant? Tick one box. 02.4 · 1 mark Evidence for shared genus Plants in the same genus as potatoes have been studied by scientists. Describe one way a new plant species could be identified... 02.5 · 6 marks Climate-resilient genetically modified crops Explain why genetic modification of crop plants may be important for the human population to survive climate change. 03.1 · 1 mark Recessive inheritance in pedigrees Describe how Figure 3 shows that the allele for AKU is recessive. 03.2 · 1 mark Identifying a heterozygous parent Which person is definitely heterozygous for AKU? Tick one box. 03.4 · 2 marks Mutations and enzyme function Suggest how a mutation can result in the production of a non-functioning enzyme. 03.6 · 2 marks Arguments against embryo screening Embryos can be screened to detect inherited disorders. Give two arguments against embryo screening. Do not refer to religion in... 04.2 · 6 marks Evolution of warfarin resistance Explain the trends in the data when warfarin was being given and when warfarin was no longer given. Use Table 1.