Plants, Tropisms and Hormones

Plants, Tropisms and Hormones 

                                        The unfurling of a flower as a day breaks

                                          or the snap of a venus flytrap shutting

                                                 


                                            occasionally plants can respond very

                                                         quickly to a stimulus

                                            but most responses in plants are too far

                                                         slow to see in real time

                                           these responses are controlled by growth

                                          growth responses are constantly at work

                                          directing plants towards or away from a

                                  stimulus to seek out the best conditions they're called

                                      tropisms the most crucial plant tropisms are to

                                                           light gravity and water

                                         responses to light are called phototropism

                                                 responses to gravity a  geotropism

                                            and responses to water are hydrotropism

                                                 growth responses are either positive or

                                             negative towards or against the stimulus

                                                                for example

                                                  when this seed germinates the chute will

                                                          always grow towards light

                                                         and upwards against gravity

                                                  whilst the roots always grow down into

                                                        the soil and towards water

                                            but how do plants control these growth

                                             responses the answer is a plant hormone

                                                   made at the tips of stems and roots

                                             auxin the amount of auxin can be affected by

                                            external conditions and it encourages growth

                                                                           for instance

                                                because light falls unevenly on this stem

                                                  more oxygen accumulates on the shaded

                                                        side causing it to grow faster

                                       the result is a stem which bends towards the light

                                                   knowing the effects of plant hormones

                                                means we can use them for own benefit

                                                    auxins are used in rooting powder

                                                         to stimulate root growth on plant

                                               cuttings and increase fruit yields for all plants

                                                tropisms provide a critical response system

                                                       allowing them to seek out the best

                                                                conditions for survival.

 

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