Plant Hormones Flashcards
Name the plant hormone process
Phototropism
Name the hormone produced
Auxin
Where is auxin produced
Tip of the shoots
Explain the process of phototropism
Is light is shining from one side there will be accumulation of auxin on the shaded side of the shoot
The cells on the shaded side elongate( grow more rapidly)
Causes the shoot to bend towards the light
Name four methods of commercial plant production
Selective weedkillers
Rooting powder
Promoting flower and fruit formation
Tissue culture
How do selective weed killers work
Hormones stimulate such a high rate of uncontrolled growth that plant disintegrates
How does rooting powder work
Hormone stimulates certain cells to develop the features of root cells
How does flower and fruit formation work
Action of hormone allows flowers to develop and then be pollinated to allow development of seeds and fruit
How does tissue culture work
Hormones can be used to stimulate the growth of all types of plant cell from a mass of cells called a callus
Benefits of selective weedkillers
The hormones used only act on weeds and not grasses
Benefits of rooting powder
Can be used to allow growth of new plants from cuttings
Benefits of promoting flower and fruit formation
Allows more fruit to be produced
Benefits of tissue culture
Allows species that are rare or very difficult to breed to be produced
