PLANT RESPONSES and GROWTH

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Revision notes for Unit 2 for OCR Biology students A2 level

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PLANT RESPONSES and GROWTH
  1. TROPISM
    1. Phototropism
      1. Geotropism
        1. Chemotropism
          1. Thigmotropism
            1. Positive=towards
              1. Negative=Away
              2. HORMONES
                1. Auxin
                  1. Cytokinins
                    1. Gibberellins
                      1. Abscisic Acid
                        1. Ethene
                          1. Transport
                            1. Diffusion
                              1. Active Transport
                                1. Mass flow in Phloem sap/Xylem Tissue
                                2. COMMERCIAL USES
                                  1. Gibberellins
                                    1. Delay senescence in citrus fruit
                                      1. + Cytokinins = elongation of fruits
                                        1. Brewing
                                        2. Cytokinins
                                          1. Tissue culture - mass production
                                          2. Ethene
                                            1. 2-chloroethylphosphonic acid
                                              1. Fruit ripening
                                                1. Fruit drop
                                                  1. Female sex expression in cucumbers
                                                  2. Auxins
                                                    1. Rooting powder
                                                      1. Seedless Fruit
                                                        1. Herbicides
                                                    2. PLANT GROWTH
                                                      1. Meristems
                                                        1. Apical
                                                          1. Lateral bud
                                                            1. Lateral
                                                              1. Intercalary
                                                                1. Cell Division
                                                                  1. Cell Elongation
                                                                  2. Photopropism
                                                                    1. Blue Light
                                                                      1. Phototropin 1
                                                                        1. Phototropin 2
                                                                      2. Shedding Leaves
                                                                        1. Cytokinins
                                                                          1. Senescense
                                                                            1. Abscission
                                                                              1. Auxin
                                                                                1. Ethene
                                                                              2. APICAL DOMINANCE
                                                                                1. Apical bud = Dominant over side shoots
                                                                                  1. Saves energy
                                                                                    1. Prevents side shoot competition
                                                                                    2. Auxin
                                                                                      1. Inhibit side shoot growth
                                                                                        1. High concentration = apical bud
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