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Ch. 25 Test A

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
The regions of tissue in a plant that produce cells that later become specialized tissues are the
a.
roots.
c.
leaves.
b.
stems.
d.
meristems.
 

 2. 
Most plant hormones are produced in rapidly dividing tissues in
a.
the buds of flowers.
c.
the underside of leaves.
b.
flowers in full bloom.
d.
the tips of roots and stems.
 

 3. 
What is the source of ethylene gas in a plant?
a.
leaf buds
c.
fruit tissues
b.
root hairs
d.
lateral meristems
 

 4. 
Powerful synthetic auxins are sometimes used as
a.
fertilizers.
c.
insecticides.
b.
herbicides.
d.
fruit ripeners.
 
 
nar001-1.jpg

Figure 25–1
 

 5. 
What is the phenomenon that is causing the bean seedling to bend as shown in Figure 25-1?
a.
gravitropism
c.
rapid response
b.
phototropism
d.
thigmotropism
 

 6. 
Gravitropism ensures that the plant in Figure 25-1 will
a.
grow roots into the soil.
b.
wrap tightly around a trellis.
c.
grow toward a light source.
d.
have shoots that grow toward the soil.
 

 7. 
The growth patterns of plants such as ivy and pole beans are regulated by
a.
gravitropism.
c.
thigmotropism.
b.
phototropism.
d.
all of the above
 

 8. 
Phytochrome is a pigment that is responsible for
a.
bud scaling.
c.
photosynthesis.
b.
gravitropism.
d.
photoperiodism.
 

 9. 
What hormones influence the shedding of leaves?
a.
auxin and ethylene
c.
gibberellin and auxin
b.
cytokinin and ethylene
d.
ethylene and gibberellin
 

 10. 
Which of the following seals a leaf off from the rest of the plant?
a.
bud
c.
waxy scales
b.
petiole
d.
abscission layer
 

 11. 
Bald cypress trees have “knees” that function to
a.
support the tree in the mud.
b.
bring oxygen down to the roots.
c.
produce seeds that float in water.
d.
photosynthesize in the deep shade.
 

 12. 
Aquatic plants that grow in mud that has little or no oxygen have adaptations that
a.
allow them to survive without oxygen.
b.
keep them from taking in too much water.
c.
let them photosynthesize below the surface of the water.
d.
help them diffuse oxygen from the air down to their roots.
 

 13. 
The dodder plant Cuscuta, which is a parasite,
a.
helps the plant on which it grows.
b.
gathers its own water and nutrients.
c.
harms the plant on which it grows.
d.
captures small organisms to meet its nutritional needs.
 

 14. 
Epiphytes differ from parasites in that epiphytes
a.
harm their host plants.
b.
grow directly on the bodies of other plants.
c.
extract water from their host plants.
d.
produce their own food.
 

 15. 
The tobacco plant produces a chemical that
a.
is probably a natural insecticide.
b.
protects the plant from insects.
c.
affects the human nervous system.
d.
all of the above
 

Completion
Complete each statement using the following terms:

deciduous         air roots         receptor         adapted         growth
 

 16. 
A target cell must contain a hormone ____________________ to which the hormone can bind.
 

 

 17. 
Very high concentrations of auxins inhibit the ____________________ of cells.
 

 

 18. 
As cold weather approaches, ____________________ plants turn off photosynthetic pathways.
 

 

 19. 
Mangroves survive in oxygenless mud by growing specialized ____________________ that have air spaces in them.
 

 

 20. 
A desert plant that is transplanted to an aquatic environment likely would not survive because it is not ____________________ to that environment.
 

 



 
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