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Plant Growth Hormones
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Auxin and
Like human¾plants produce hormones to that allow plants to grow in response to a stimulus
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A positive examples of tropisms are
A I
stimulus
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PHOTOTROPISM
the growth of plant
in4
response +0 Jjgbt
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GRAVITROPISM (GEOTROPISM)
fhö growth
are
in response
of a planf
L =theg-grow downwards
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Auxin, a plant hormone controls the growth at the tips of shoots and roots
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If the tip of a shoot is removed the shoot stops growing because no auxin is
available
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Shoots are positively phototropic
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This makes the cells elongate (grow) faster on the shaded side, so
the shoot bends towards the light
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When a root grows
sidewavs, gravity causes an uneven distribution of auxin in the root tip,
with more on the lower side
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elongate
gravity
gravitg
This response allows the plant to extend its roots deep in the soil,
so they are well anchored
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The plant hormone gibberellin
During the period of germination seeds release plant hormones called gibberellins
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Gibberellin also stimulates stem growth by stem elongation, helping the plant to grow tall