Plant hormones Flashcards
What stimuli do plants respond to?
Light, gravity and touch.
What hormone do plants have?
Auxins which control growth at the ends of the shoots and roots in plants.
What is phototropism?
A response to light.
What is gravitropism?
A response to gravity.
What happens if the tip of a shoot is removed?
No auxin will be available and the shoot may stop growing.
What direction do shoots grow?
Towards the light and away from gravity.
What direction do root grow?
Towards gravity.
What are auxins used for?
Killing weeds
Growing from cuttings with rooting powder
Growing cells in tissue culture
What does gibberellin do?
Stimulates plant cells to grow.
What is giberellin used for?
Controlling dormancy
Inducing flowering
Growing larger fruit
What does ethene do?
Stimulates the ripening of fruit.
