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Plant Growth Hormones


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Tropisms
Plant growth responses
Positive tropism
Growth towards a stimulus
Negative tropism
Growth away from a stimulus
Phototropism
A growth towards light
Gravitropism
A growth downwards (positive) or upwards (negative) in response to gravity
Auxins
Plant growth hormones which control growth at the tips of shoots and roots
Gibberellins
Plant growth hormones which stimulate seed germination, stem growth and flowering
Uses of gibberellins
Weedkillers, rooting powder for currings, controlled ripening of fruits while in transportation or in shops, applying them to unpollinated flowers so the fruit grows but not the seeds