Be able to describe generally what happens at each stage. Give a bioassay for gibberellin activity. Gibberellic acid effects the transition from juvenile to adult phases in at least some plants. Describe two examples where this is the case. Describe the economic importance of one of these examples.
Gibberellic acid can play an important role in seed germination.
Describe two different ways that GA affects processes in seed germination. Draw the structure of ethylene. In the early part of the twentieth century, streets were lighted by coal burning lamps. It was noted that many trees close to the lamps dropped their leaves prematurely, relative to trees that were not close to the lamps. Based on your knowledge of ethylene and auxin, offer an explanation as to why the lamps might be the cause of leaf drop.