Unit-4 Tutorial on practice of Commend words Edexcel Examinations Comment on: Requires the synthesis of a number of factors from data/information to form a judgement. More than two factors need to be synthesised. 1. The composition of three seaweeds, U. fasciata, S. linifolium and C. officinalis, collected from a beach in Egypt, was determined. The table shows some of the compounds found in two of these seaweeds. *(i) These seaweeds are considered to be a healthy, environmentally-friendly and economic food source. Comment on this statement. Use the information in the table and your own knowledge to support your answer. 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AIS/BIOLOGY/DEEBAN CP/ Tutorial on practice of Commend words Edexcel Examinations 1 2. The photograph shows a tawny owl. These owls live in areas close to the Arctic Circle. The scientists concluded that feather colour in owls is controlled by a single genetic locus. The brown allele is dominant to the grey allele *(a) The scientists investigated the effect of climate change on the frequencies of these two alleles for feather colour in populations of tawny owls. The percentage survival rates of both colours of owl were measured when there were different depths of snow. The mean depth of snow was recorded each year between 1980 and 2007. The percentage of owls that were coloured brown between 1960 and 2007 was also recorded. The graphs show the results. AIS/BIOLOGY/DEEBAN CP/ Tutorial on practice of Commend words Edexcel Examinations 2 The scientists concluded that increased greenhouse gases from human activity are resulting in an increase in the frequency of the brown allele. Evaluate Review information then bring it together to form a conclusion, drawing on evidence including strengths, weaknesses, alternative actions, relevant data or information. Come to a supported judgement of a subject’s qualities and relation to its context. Analyse the data to evaluate this conclusion. 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AIS/BIOLOGY/DEEBAN CP/ Tutorial on practice of Commend words Edexcel Examinations 3 3. Grassland is an important habitat for grazing animals such as cattle. (a) Fields used for grazing cattle must have a high gross primary productivity. Give/State/Name All of these command words are really synonyms. They generally all require recall of one or more pieces of information. State what is meant by the term gross primary productivity and include the units in which it is measured. (2) ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... Describe To give an account of something. Statements in the response need to be developed as they are often linked but do not need to include a justification or reason. (b) Cattle graze on the plants on grassland. Describe what happens to the energy in the plants that are not eaten by cattle. (2) ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... *(c) When grazing animals such as cattle, sheep and horses are kept in fields, their faeces are left on the ground, and are known as dung. The dung is eaten by dung beetles, which in turn are eaten by other animals. Dung beetles bury dung up to one metre underground in tunnels they have made. This removes the dung from the surface of the field. A cow can produce over eight tonnes of dung per year. There are around 60 species of dung beetle in the UK. In 2016, 50% of these were identified as being scarce or threatened. The photograph shows a dung beetle. AIS/BIOLOGY/DEEBAN CP/ Tutorial on practice of Commend words Edexcel Examinations 4 Scientists believe factors causing the decline of dung beetles include: • farmers using more land to grow crops, and using more land for building and development • keeping some grazing animals in sheds over the winter, rather than them spending the winter in fields • fewer habitats for dung beetles, leading to populations of dung beetles becoming isolated and preventing outbreeding • grazing animals routinely being treated with anti-parasitic drugs that can kill dung beetles. Some scientists have stated that farming practices need to change to conserve the species of dung beetle, and to maintain biodiversity and the stability of ecosystems. Discuss Identify the issue/situation/problem/argument that is being assessed within the question. Explore all aspects of an issue/situation/problem. Investigate the issue/situation/problem etc. by reasoning or argument. Discuss the validity of this statement. 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AIS/BIOLOGY/DEEBAN CP/ Tutorial on practice of Commend words Edexcel Examinations 5 ANSWERS: 2. AIS/BIOLOGY/DEEBAN CP/ Tutorial on practice of Commend words Edexcel Examinations 6 3. a) b) AIS/BIOLOGY/DEEBAN CP/ Tutorial on practice of Commend words Edexcel Examinations 7 c) AIS/BIOLOGY/DEEBAN CP/ Tutorial on practice of Commend words Edexcel Examinations 8
