Uses of Plant Hormones

• why do humans use plant hormones in agriculture

  to increase yield , to obtain desirable features, to lower costs
• what is auxin used for

  weed killers
• how is auxin used as weed killers

  weeds are broad leaved

  weedkillers contain auxin , are synthesised to only affect broad-leaved plants

  increased amount of auxin causes cells to grow too rapidly

  weed dies
• how is auxin used as rooting powders

  plants with desirable features are cloned to make more plants with that feature

  take a cutting from original plant

  root powder placed on cutting , placed in ground

  roots grow and new plant grows very quickly
• how is auxin used to promote growth in tissue culture

  tissue culture is a way to clone a plant

  cells from plant are placed in growth medium containing nutrients

  auxin is added

  cells form roots and shoots
• what does ethen control

  ripening
• how is ethene used in the food industry

  fruit picked when its unripe

  it gets exposed to ethen and warm temperature

  ethene contols cell division and stimulates enzymes that result in fruit ripening
• how does ethene help the food industry

  ripening reduces wastage as fruit is suitable to be sold and doesnt ripen too early
• what are gibberellins used for in seeds

  ending seed dormancy

  germination of barley seeds increased to make malt
• what are gibberellins used for in flowers

  promoting flowering

  applying it to flowers allows it to flower in any conditions and much larger flowers
• what are gibberellins used for in fruit

  increasing fruit size

  the seeds in fruit produce gibberellins to increase they're size (seedless fruits are smaller) , seedless fruit is sprayed with gibberellins to increase their size