Nervous System and Hormones ~ Biology 0.0 / 5 ? BiologyNervous system, hormones and behaviourGCSEEdexcel Created by: NettleShipCreated on: 14-01-14 19:34 Tropism A response to a stimulus in which an organism grows towards or away. 1 of 11 Negative Tropism Tropism in which the response is away from the stimulus. 2 of 11 Phototropism Tropism in response to light. 3 of 11 Auxins Plant hormone that affects the growth and elongation of cells in plants. 4 of 11 Geotropism Tropism in response to gravity. 5 of 11 Germination When a seed starts to grow a shoot and a root. 6 of 11 Gibberellins Set of plant hormones that can cause seeds to germinate and flowers and fruit to form. 7 of 11 Are plant shoots positively or negatively phototropic? Positively. 8 of 11 Are plant roots positively or negatively phototropic? Negatively. 9 of 11 Do auxins in roots reduce or stimulate cell growth? Reduce. 10 of 11 Do auxins in shoots reduce or stimulate cell growth? Stimulate. 11 of 11
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