Plant Hormones And Their Uses

in seeds

• because it causes starch in a seed to turn into sugars - which the seed needs uses for energy to grow

• stem growth • flowering • fruit development

• selective weed killers • rooting powder • seedless fruit • fruit ripening

• they are sprayed on crops and kill any plants with broad leaves like weeds by making them grow too fast • it doesnt affect the crop sprayed on because they would have narrow leaves or be cereals

• the powder contains auxins - so when the shoot is dipped into the powder it stimulates it to grow roots rapidly

• normally if a flower doesnt get pollinated the seeds wont grow • if plant hormones such as giberellins are applied to the unpollinated flowers of some types of plant • the fruit will grow but the seeds won’t • some seedless citrus fruits can be grown this way

• ethene is made by many fruits • it is a hormone that causes them to ripen • fruits are picked green and ripened in storage using ethene gas.

• auxin • gibberellin • ethene / ethylene

• diffusion • active transport • or mass flow

• ripen and grow crops faster means more money • can get rid of pests like weeds and cause them to not grow back • quicker than digging out weeds

• may not work and weeds may still grow which is promising something that isnt met • adding hormones to change them is said to be poisoning by some people • weedkiller is dangerous to the surrounding environment

• fruit with seeds in the middle normally only grows on flowering plants that have been pollinated by insects • If the flower doesn’t get pollinated the fruit and seeds don’t grow