BIOL 115 Lecture Notes - Lecture 20: Gravitropism, Auxin, Phototropism
25 Jun 2016
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Auxin: auxin controls plant shape by controlling the growith of the lateral branches through apical dominance, darwin discovered that the very tip of the coleoptile reacts to the light (positive phototropism) If you remove the shoot apex (apical bud), side branches start growing (this is the basis of pruning) Asexual reproduction: vegetative or asexual reproduction: parts of the vegetative body regenerates shoots and roots, potato tuber (?) Is an underground stem modified for storage of food materials: potato eyes are actually axillary buds in the axils of scale leaves, under appropriate conditions, the bud grows out into shoots. Flowers: the structure of a dicot angiosperm flower: Each carpel has an ovary, style and stigma. If one of the plants is induced, the other one also flowers. Fertilization in angiosperms: double fertilization virtually unique to angiosperms, a process in which the nuclei of two sperm fertilize one egg.
