AS & A Level Biology (9700) — May–June 2025, Paper 42
10 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Fig. 1.1 shows a diagram of part of the inner membrane of a mitochondrion with five numbered structures. Structures 1, 2, 3 and 4 are electron carriers (ETC components). Structure…
Answer this question and get it marked →When organisms reproduce, they pass on their alleles to the next generation. There are many factors that can affect how allele frequencies change over time in a population.…
Answer this question and get it marked →Rice, Oryza sativa, is an important grain crop. A rice grain is a seed and can have a structure known as an awn, which projects from the tip of the grain. The development of awns…
Answer this question and get it marked →Sexual reproduction in plants and animals involves the formation of gametes as a result of meiosis and the process of fertilisation. In most species of plants and animals, the…
Answer this question and get it marked →A number of diseases in humans can be treated using recombinant human proteins. These are produced by recombinant DNA technology. To produce a human protein for treatment of a…
Answer this question and get it marked →Guard cells are located in the epidermis of the leaves of most plants. When environmental conditions change, this causes changes in guard cells that control the opening and…
Answer this question and get it marked →An axon membrane is described as being at its resting potential when an action potential is not occurring. Describe and explain how a resting potential of an axon membrane is…
Answer this question and get it marked →A lichen describes a mutually beneficial association of a fungus with an organism termed a photobiont. An example of a photobiont is the green alga, Trebouxia sp., which is a…
Answer this question and get it marked →The biodiversity of an area can be assessed using a variety of sampling methods. Outline how a frame quadrat could be used to assess the biodiversity of plants in a field.
Answer this question and get it marked →The grey seal, Halichoerus grypus, is an aquatic mammal that lives in the North Atlantic Ocean. It feeds on fish, which it hunts at depths of up to 70 metres. Diving to hunt for…
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