Auxins (Grade 12 NSC Matric Life Sciences): Flashcards
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10 cards from this deck
Auxins
Auxins
Plant hormones controlling growth and responses
Where auxins are made
Where auxins are made
Growing tips of stems, roots, and apical buds
Apical dominance
Apical dominance
Stem tip auxins inhibit nearby lateral branch growth
Shape from apical dominance
Shape from apical dominance
Tapered, Christmas tree-like shape
Effect of removing stem tip
Effect of removing stem tip
Lateral branches grow vigorously
Why remove tips in fruit farming
Why remove tips in fruit farming
More branches lead to increased fruit yield
Phototropism
Phototropism
Plant growth towards light
Auxin movement in unilateral light
Auxin movement in unilateral light
Redistributes to shaded side
Why plants bend to light
Why plants bend to light
Shaded side grows faster (more auxins)
Overhead light effect
Overhead light effect
Even auxin distribution, straight growth