The study of plant hormones provides a fascinating insight into the way plant growth and development is controlled. This Plant Hormones set can be used to demonstrate the role of plant hormones and their use by man, thus experiments on breaking dormancy in seeds, rooting cuttings, killing weeds, preventing leaves from dropping, etc. are included. These experiments are not difficult to perform and many are suitable for GCSE students. Possible investigations include:. Encouraging root formation. Preventing buds from sprouting. Controlling the germination of seeds. Controlling leaf fall. Selective herbicidal action. Growing fruits without seeds. Acceleration of fruit ripening. The effect of I.A.A. on shoot growth. The effect of I.A.A. on root growth. The effect of Gibberellic Acid on genetically dwarf plants. Tropic responses. The set contains:. Full teaching notes. Culture Medium - enough to make up 20 Litres. Indol-3-yl acetic acid - 1.5g. Lanolin - 100g. Gibberellic acid - 0.5g. 2.4D Herbicide - 10ml. 0.1% IAA in lanolin paste - 100g. Coumarin - 5g. N.A.A. - 10g. 0.01% IAA in lanolin paste. Thiourea - 10g. Ethrel C - 10ml. Tetrazolium chloride - 1g. Agar - 10g.
