13 Turn over 5 Gibberellin stimulates cells in the aleurone layer of cereal grains, such as barley, to produce the enzyme amylase. The diagram shows the location of the aleurone layer in a barley grain. seed coat aleurone layer X (a) The part labelled X contains triploid cells. Name the part labelled X. (1) .................................................................................................................................................................................................................................................................................... (b) The diagram shows a cell from the aleurone layer with some of the structures involved in the production of amylase. GA receptor GA cell wall plasma membrane amylase 14 Gibberellin binds to a protein receptor in the cell surface membrane and this stimulates transcription in the nucleus. (i) Describe the process of transcription in the nucleus of this cell. 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(ii) Describe the processes occurring after transcription that result in the release of amylase from the cell shown in the diagram. 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A student read that salt (NaCl) inhibits gibberellin synthesis. This could affect amylase production in cereal grains. Devise an investigation to show the effect of salt concentration on amylase production in cereal grains. 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(Total for Question 5 = 13 marks)