Response in Plants and animals
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1
What do simple organisms need?
Favourable environment
2
How do simple organisms respond?
By moving to suitable areas
3
What is tactic response?
Directional movement to a stimulus
4
What is kinetic response?
Non-directional movement to a stimulus
5
What is a choice chamber used for?
Investigating animal responses
6
What does a choice chamber consist of?
Different conditions for stimuli
7
What is the control in a choice chamber experiment?
Normal environment without stimuli
8
What should you record in a choice chamber?
Number of organisms in each condition
9
What is tropism?
Growth movement in plants
10
What is phototropism?
Response to light
11
What is gravitropism?
Response to gravity
12
What is positive phototropism?
Growth towards light
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What is negative phototropism?
Growth away from light
14
What is positive gravitropism?
Growth towards gravity
15
What is negative gravitropism?
Growth away from gravity
16
What are growth factors?
Hormones controlling growth in plants
17
Where are growth factors produced?
Growing regions of shoots
18
What is IAA?
Indoleacetic acid, an auxin
19
What does IAA stimulate in shoots?
Cell elongation
20
What does IAA inhibit in roots?
Cell elongation
21
Where does IAA move to in light?
Shaded parts of shoots
22
Where does IAA move to in gravity?
Lower side of roots
23
What does IAA cause in shoots?
Bends towards light
24
What does IAA cause in roots?
Bends towards gravity
25
How do roots grow in uneven moisture?
IAA concentrates in moist side
26
What does IAA in roots cause?
Slower growth on moist side
27
What is phototropism's purpose?
Maximizes light for photosynthesis
28
What is gravitropism's purpose?
Anchors plants and accesses nutrients
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