they need light to produce food; called positive phototropism - Why do plants bend toward light?, hormones - What controls how plants grow?, because some are short-day plants, some are long-day plants, and others are day neutral - Why do some plants bloom only at certain times of year?, it is worthwhile because people buy plants and growers can make money; flowers cheer people up - Should plants be used for purely decorative purposes?, growing away from light (roots) - negative phototropism, growing away from pull of gravity - negative gravitropism, growing toward objects plants touch - thigmotropism, cause shoots and stems to grow by causing their cells to enlarge - auxins, cause cells to divide (help when there isn't much water) - cytokinins, ripens fruit; closes phloem and xylem in the fall - ethylene, need longer nights to grow - short-day plants, need shorter nights to grow - long-day plants, uncencerned with length of night; just need right temperature and moisture - day-neutral plants,

Aaden Science Chapter 9

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