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

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Pearson Edexcel Level 3 GCE Biology A (Salters Nuffield) Advanced PAPER 3: General and Practical Applications in Biology 9BN0/03Answer ALL questions. Write your answers in the spaces provided. 1 Whe... n 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 [Show More]

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