Uses of Plant Hormones, CBSE Class 10 Biology Video Lecture

so by this point you already know all
about tropisms auxins and gibber aliens
and are now ready to have a think about
how our knowledge of plant hormones can
actually be put to use you may want to
watch these two videos first so how do
you think growth hormones or auxins can
be used as selective weed killers pause
the video and have a think if you
thought of the following then give
yourself a pat on the back because it's
definitely not obvious the selective
weed killers contain growth hormones
which cause the weeds to grow really
quickly this means the weed is absorbing
nutrients from the soil at a much higher
rate and so the weeds absorb the weed
killer in much larger quantities than
beneficial plants this can be used for
getting rid of weeds without killing the
grass or thistle in a field without
killing the crop but they aren't just
good at killing plants
gardez use growth hormones to promote
growth they take cuttings of plants and
dip the stalk into a rooting powder
which contains growth hormones this
makes stem cuttings quickly develop
roots and establish as functioning
plants but the use of plant hormones
doesn't stop there they can also be used
in controlling fruit ripening some slow
it down and others speed it up we can
use this knowledge to inhibit hormones
during transport so that the fruit does
not ripen too quickly
or we can promote ripening when it is in
the shops so that it is in the perfect
condition for consumers bite into a
banana and you don't expect seeds do you
almonds sprayed onto flowers he'll stop
seeds developing leaving us with big
juicy seedless fruits in nature plants
only germinate when conditions are ideal
for growth this is called seed dormancy
and is controlled by hormones how do you
think we can make use of dormancy pause
the video and have a think we can use
hormones and inhibitors to remove the
dormancy of seeds
thus in anything else to germinate seeds
at all times of the earth we can also
use these hormones to make plants grow
bushier and make them flower at control
times exactly what you want if you are
entering a flower show crunchy red
apples juicy ripe mangoes sweet bananas
you can thank Italy for ripe fruit
ethylene breaks down components of the
cell walls to make them softer and makes
them sweeter by converting
two sugars ever wonder why you are told
to put unripe fruit next to ripe fruit
it isn't as if ripe fruit can chat up
the unripe fruit and tell them to ripen
up so what is happening ethylene is
different to other hormones because it
is an airborne gas and works on a
positive feedback loop start with a
little ethylene and this causes more
ethylene to be released which in turn
causes even more ethylene to be released
and so on therefore promoting wrapping
in all local fruit so from this video
you should know now that plot hormones
have many uses from weed killers to
promoting growth in rooting powders from
controlling fruit ripeness to insurance
e-business and controlling dormancy