38. What are the types of
plant geotropisms? Why do
the stem and the root present
opposite geotropisms?

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The types of geotropisms the
positive geotropism, that which the
plant grows favor of the gravitational
, as for example in , and the
negative geotropism, against the
gravitational force, example, in the
stem.

geotropism and stem geotropism
opposed due to different
to auxin concentration in
structures. The following
experiment demonstrate the
phenomenon: Stem root are placed
in horizontal position (parallel to
ground) and naturally auxins
along their bottom part.

this condition it is that
the stem grows and the root
grows . This happens
because in stem the high auxin
in the bottom makes
side grow (longitudinally) more the
structures arcs upwards. the root the
high concentration in the bottom
the growth of this and the
upper side more making the root
curve downwards.