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Pearson Edexcel Level 3 GCE 9BN0/03 2022 Biology A (Salters Nuffield) Advanced PAPER 3: General and Practical Applications in Biology

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nswer ALL questions. Write your answers in the spaces provided. 1 When oat seeds germinate, they produce roots and a coleoptile. (a) The effect of shading the tip of the coleoptile was investigated... . The diagram shows how the coleoptile of an oat seedling can bend towards light. coleoptile in the dark illuminated for 2 hours 1 cm direction of light angle of curvature roots seed Oat seeds were germinated. When the coleoptiles were 2 cm long the seedlings were split into three groups. • Group 1 none of the tip of the coleoptile was shaded • Group 2 5 mm at the tip of the coleoptile was shaded • Group 3 10 mm at the tip of the coleoptile was shaded All the coleoptiles were then exposed to light from one side. The curvature of the coleoptiles was measured after intervals of 2 hours and 3 hours. The results of this investigation are shown in the graph. 0 5 10 Length of coleoptile tip shaded / mm 35 [Show More]

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