biology topic 5 - plant horomones
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8 Terms
how can plants respond to their enviroment
sense light and grow their shoots towards it to maximise photosythesis
snese gravity - grow their shoots downwards to fix themselves into the soil and find more mineral and water ions
sense touch so they can climb around other objects
what are auxins
plants hormone which control growth at the ends of the shoots and the roots and once they are produced in the tips they then disslove in the solution then diffuse backs in the shoots.
in the shoots they stimulate growth
in the roots they inhibit growth
what is phototropism
response to light
what is geotropism
response to gravity
2 rules for auxins
for the shoots they will always acculmate on the shaded side and for the roots the lower side rather than the upper side
what do auxins do as well as growth
use them to kill weeds
what are the 3 main uses of gibberllin
controlling dormancy - induce germination - grow more crops
inducing flowering - more flowers and bigger ones
growing larger fruit - grower larger fruits
what can ethene do
stimulate the ripening of fruit