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Biology help HERE ONLY!!

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Nera:
can anyone explain 2 me phototropisms and specifically action of auxins

lana:
phototropism is growth in response to the direction of light 
auxin is a hormone made in the tips of roots and shoots one effect of auxin is to inhibit growth of side shoots that's why a gardener who wants a  plant to stop growing taller and become more bushy will cut off the shoot tip so removing the source of auxin .

1-auxin effect in shoots : auxin in the shoots move away from the light to the darker side and encourages growth by increasing cell elongation so the darker side grows more than the lighter side and so the shoot bend towards light source
2-auxin effect in roots : gravity causes auxin to collect on the lower side ( towards the ground/soil) in this case it stops cells elongating(growth) which causes the root to bend downwards .

hope it helps  :)

SGVaibhav:
Auxins____


SWEETSH WHERE ARE YOU. SAIFALAN WHERE ARE YOU.
Do you all remember, the hair growing and ...

SGVaibhav:
 ???  looks like sweetsh did not read this

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