1. The process in which an embryo sporophyte resumes growth after a period of dormancy is ________.
germination
budding
phototropism
senescence 1 2 3 4 5

2. Plant cells differentiate in size, shape, and function during the process of ________.
germination
dormancy
growth
development 1 2 3 4 5

3. Which of the following is not a class of hormones that controls plant growth?
auxins
phytochromes
cytokinins
gibberelins 1 2 3 4 5

4. Which of the following is a common application of the hormone ethylene?
to promote root formation in cuttings
to propagate tissue cultures
to ripen green fruit
to induce dormancy for shipping 1 2 3 4 5

5. In order for a hormone to influence a plant cell, it must first ________.
enter the cell by diffusion
enter the cell by active transport
activate a membrane receptor
bind to a phagocyte 1 2 3 4 5

6. Water induces embryonic plant cells to release the hormone ________.
gibberelin
ABA
ethylene
auxin 1 2 3 4 5

7. Which hormone is produced in the coleoptile tip to induce elongation?
amylase
abscisic acid
ethylene
auxin 1 2 3 4 5

8. Auxin causes cells to elongate by the process of ________.
photosynthesis
polar transport
gravitropism
solar tracking 1 2 3 4 5

9. Plant movements in response to environmental stimuli are called ________.
trophic cycles
tropisms
abscission
senescence 1 2 3 4 5

10. Phototropism is dependent upon the action of the hormone ________.
amylase
abscisic acid
ethylene
auxin 1 2 3 4 5

11. The curling of vines and tendrils in response to contact is called ________.
phototropism
thigmotropism
gravitropism
photosynthesis 1 2 3 4 5

12. Mechanical stress (shaking) can cause plants to ________.
grow taller
bend toward the stimulus
produce curling tendrils
have shorter stems than greenhouse plants 1 2 3 4 5

13. A biological response to changes in the length of darkness or light in a circadian rhythm is known as ________.
thigmotropism
phototropism
photoperiodism
photosynthesis 1 2 3 4 5

14. The pigment phytochrome (Pfr) is involved in all of the following plant functions except ________.
germination
flowering
thigmotropism
dormancy 1 2 3 4 5

15. Photoperiodic plants flower in response to ________.
day length
night length
age
temperature 1 2 3 4 5

16. Low-temperature stimulation of flowering is known as ________.
acclimatization
polarization
vernalization
abscission 1 2 3 4 5

17. The dropping of plant parts at the end of a growing season is called ________.
abscission
dormancy
senescence
vernalization 1 2 3 4 5

18. A state of dormancy is induced by ________.
short days
long, cold nights
dry, nitrogen-deficient soil
a combination of the choices 1 2 3 4 5

19. Senescence is the segment of the life cycle from ________ to ________.
seed formation, germination
dormancy, vernalization
budding, dormancy
maturity, death 1 2 3 4 5

20. Which of the following plant movements involves a reversible change in cell turgor?
phototropism
solar tracking
gravitropism
thigmotropism 1 2 3 4 5