Topic 6 : Organisms respond to changes in their internal and external environments Flashcards
1
Q
What is a stimuli?
A
A change in an organism’s internal or external environment.
2
Q
What is a tropism?
A
Growth of a plant in response to a directional stimulus.
Positive = towards stimulus
Negative = away from stimulus
3
Q
Describe how indoleacetic acid (IAA) affects cells in shoots
A
High concentrations of IAA stimulate cell elongation
4
Q
Describe how indoleacetic acid (IAA) affects cells in roots
A
High concentrations of IAA inhibit cell elongation
5
Q
Explain gravitropism in flowering plants
A
