Plant Growth Factors (AQA A-Level Biology): Flashcards
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Plant growth factors
Plant growth factors
Chemical messengers controlling plant growth & development
Positive phototropism
Positive phototropism
Shoots grow towards light sources
Positive gravitropism
Positive gravitropism
Roots grow downwards towards gravity
IAA full name
IAA full name
Indoleacetic acid
Tropism definition
Tropism definition
Directional growth response of a plant to a directional stimulus
How IAA causes phototropism
How IAA causes phototropism
Light moves IAA to shaded side, causing more growth there
IAA effect on root cells
IAA effect on root cells
High IAA inhibits cell elongation in roots
Gravitropism in shoots
Gravitropism in shoots
Negative - shoots grow away from gravity
Acid growth hypothesis
Acid growth hypothesis
IAA pumps into cell wall, increases plasticity
Briggs's key finding
Briggs's key finding
Light causes uneven IAA distribution, not production