Plant Hormones (OCR GCSE Biology A (Gateway Science Suite)): Flashcards
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Practise the cards
13 cards from this deck
What are tropisms?
What are tropisms?
Plant growth responses controlled by hormones
Define phototropism
Define phototropism
Plant growth response to light
Define gravitropism
Define gravitropism
Plant growth response to gravity
What is auxin?
What is auxin?
A plant hormone involved in growth responses
Type of phototropism in most plants
Type of phototropism in most plants
Positive (grow towards light)
Where does auxin move in phototropism?
Where does auxin move in phototropism?
To the shaded side of the shoot
Type of gravitropism in shoots
Type of gravitropism in shoots
Negative (grow away from gravity)
Auxin effect on shoot cells in gravitropism
Auxin effect on shoot cells in gravitropism
Stimulates lower side cells to grow more
Type of gravitropism in roots
Type of gravitropism in roots
Positive (grow towards gravity)
Auxin effect on root cells
Auxin effect on root cells
Less auxin = more growth; upper side grows more
Benefit of roots growing downward
Benefit of roots growing downward
More water, nutrients, and stability
Function of gibberellins
Function of gibberellins
Stimulate seed germination
Function of ethene
Function of ethene
Cell division and ripening of fruits