Plant hormones (Edexcel GCSE Biology): Flashcards
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15 cards from this deck
Tropisms
Tropisms
Plant growth responses towards light & water sources
Positive tropism
Positive tropism
Plant grows towards the stimulus
Negative tropism
Negative tropism
Plant grows away from the stimulus
Phototropism
Phototropism
Growth of plant shoots towards light
Stem phototropism type
Stem phototropism type
Positive (grows towards light)
Root phototropism type
Root phototropism type
Negative (grows away from light)
Auxins
Auxins
Plant hormones that control growth by cell elongation
Common auxin example
Common auxin example
Indole Acetic Acid (IAA)
Where auxins are produced
Where auxins are produced
Apical meristem (tips of stems & roots)
Auxin effect: shoot vs root
Auxin effect: shoot vs root
Promotes growth in shoot, inhibits growth in root
Gravitropism/geotropism
Gravitropism/geotropism
Plant's response to gravity
Stem gravitropism type
Stem gravitropism type
Negative (grows against gravity, upwards)
Root gravitropism type
Root gravitropism type
Positive (grows with gravity, downwards)
Rooting powder contains
Rooting powder contains
Auxins to produce roots rapidly in cuttings
Gibberellins stimulate
Gibberellins stimulate
Seed germination, stem growth & flowering