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9 Cards in this Set

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  • Back

describe the direction that shoots grow in, relating to the things that they are sensitive to

shoots are sensitive to light, they grow towards light.

describe the direction that the roots grow in, relating to the things that they are sensitive to

roots are sensitive to gravity they grow towards the force of gravity

what is the name of the hormones in plants

auxin

what is photoropism

plant growth reponse to light

describe how auxin controls phototropism

causes cell elongation in the shoot

what is geotropism

plant growth response to gravity

describe how auxin controls geotropism

stops cell elongation in the root

what do negative and positive tropisms means

positive tropism = towards stimulus





negative tropism = away from the stimulus

how can plant growth hormones be used in agriculture

selective weed killers- auxin makes broad leaved plants grow out of control and die.


rooting powder- auxin makes cutting develop roots quickly.


seedless fruit- flowers sprayed with hormones to make fruit develop but not seeds.


fruit ripening- farmers use hormones to control fruit ripening