Ch
17 review sheet ANS
1toward red light
2 absorbs red light, but passes far-red
3 exposure to red
light.
4 phytochrome
5 A pigment that absorbs light and
affects seed germination
6 660
nm
7 False
8 seed germination stem growth flowering
9 alternation of the two forms of phytochrome
10 True
11 Seed germination can be promoted by the modes of action of two of the phytochromes: the low-fluence response
12 RED
13Pfr
suppresses flowering
14 entrainment
15
24-hour
16 False
17 False
18. auxin.
19. phototropism; auxin
20. auxins
21.
Auxins are found at highest concentrations and
stimulate growth on the darker side of the shoot.
22.
gravity; auxin
23.
Photoperiodism
24 . Turgor movement
25.
What is phytochrome
and how does it regulate flowering?
26.
Explain what is meant by signal transduction in plants using your primary
example the roles of the light sensitive pigment, phytochrome,
in plant development and morphogenesis.
27.
What is the role of light controlling the growth and
development in plants excluding the role of light in photosynthesis