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Plant Hormones and Growth

Auxins are plant hormones which control growth at the tips of roots and shoots
Auxins are dissolved in a solution of water
Auxins stimulates cell elongation
Inhibits growth in the roots
Promotes growth in the shoot
Auxins use light responses from light (phototropism) and gravity (geotropism)…

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Uses of Plant Hormones:



Selective Weed killers:

Attacks some plants but not others ­ only affects broad leaved plants

Contains a growth hormone which makes them grow too quickly



Rooting Powder:

Provides roots to stem cuttings quickly

Allows clones of plants to be make very quickly



Controlling Fruit Ripening:

Plant…

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