Plant hormones Flashcards
What is the role of plant hormones?
To coordinate and control growth and responses to light and gravity
What is a positive tropism? Give an example of a positive tropism
Where a plant grows towards a stimulus e.g. shoots and light
What is a negative tropism? Give an example of a negative tropism.
Where a plant grows away from a stimulus e.g. roots and light
Where is auxin produced in the shoot?
The tip
If a light is shining on the side of a shoot, where will the auxin move to?
The other side
What effect does auxin have on the cells in a shoot?
They cause cell elongation
Where is auxin produced in the root?
The tip
What effect do auxins have on the cells in the roots?
They stop cell elongation
What is the effect of gibberellins on plants?
Involved in growth and to overcome dormancy in seeds
How are gibberellins used in agriculture and horticulture?
To end seed dormancy, promote flowering and increase fruit size
What is the effect of ethene on plants?
Controls cell division, promotes flower opening and involved in the dropping of leaves
How is ethene used in agriculture and horticulture?
Used in the food industry to control ripening of fruit during storage and transport
How are auxins used in agriculture and horticulture?
Used as weed killers, as rooting powders and for promoting growth in tissue culture.
