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Name: 
 

Ch31 Plant Responses



Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 
 
The diagrams below illustrate an experiment that was performed to better understand how plants grow toward the light. Diagram 1 illustrates the cut tip of a seedling that was put on a block of agar.

plant_resp_files/i0020000.jpg
 

 1. 

Refer to the illustration above. In the diagram, the plant growth hormones that diffused into the agar block from the tip of the seedling are called
a.
meristems.
c.
auxins.
b.
gibberellins.
d.
herbicides.
 

 2. 

Refer to the illustration above. Plant growth hormones caused the stem in diagram 3 to bend by
a.
exerting a cohesive force on the stem.
b.
causing cells to reproduce at a greater rate on one side than on the other.
c.
causing cells to elongate on one side more than on the other.
d.
making translocation occur.
 

 3. 

Which of the following hormones normally exist(s) in a gaseous state?
a.
auxins
c.
ethylene
b.
cytokinins
d.
gibberellins
 

 4. 

Which of the following hormones promote(s) cell division in plants?
a.
abscisic acid
c.
cytokinins
b.
gibberellins
d.
auxins
 

 5. 

Apical dominance
a.
is caused by gibberellins in terminal buds.
b.
stimulates terminal buds to elongate.
c.
is the inhibition of lateral bud growth by the presence of a shoot tip.
d.
results from gardeners cutting terminal buds in growing plants.
 

 6. 

Which of the following is (are) used to create ornamental trees?
a.
cytokinins
c.
ethylene
b.
auxins
d.
gibberellins
 

 7. 

Which of the following is a result of an application of a synthetic auxin to improve crop production?
a.
formation of new roots on stem and leaf cuttings
b.
faster ripening of fruits
c.
smaller fruit size
d.
formation of new buds in tissue culture
 

 8. 

Plant movements that occur in response to touch and are independent of the direction of the stimulus are called
a.
phototropic movements.
b.
thigmonastic movements.
c.
nyctinastic movements.
d.
chemotropic movements.
 

 9. 

stems : negative gravitropism ::
a.
light stimulations : gravitropism
b.
gravity movements : phototropism
c.
stems : negative phototropism
d.
roots : positive gravitropism
 

 10. 

All of the following generally cause tropisms in plants except
a.
light.
c.
touch.
b.
gravity.
d.
heat.
 

 11. 

When vines grow, they often wrap tendrils around objects for support. The tendrils wrap because of
a.
phototropism.
c.
thigmotropism.
b.
gravitropism.
d.
chance.
 
 
plant_resp_files/i0140000.jpg
 

 12. 

Refer to the illustration above. Which part of the plant exhibits positive phototropism?
a.
1
c.
3
b.
2
d.
4
 

 13. 

Refer to the illustration above. Which part of the plant exhibits negative gravitropism?
a.
1
c.
3
b.
2
d.
4
 

 14. 

Which of the following does not occur as a result of changes in turgor pressure?
a.
closing of a leaf trap on a Venus’ flytrap plant
b.
folding of Mimosa leaves
c.
folding of prayer plant leaves
d.
twining of ivy plants around an object
 

 15. 

Many plants respond to changes in day length because of
a.
an electronic sensor in their leaves.
b.
a specialized stoma that responds to changes in light and darkness.
c.
a pigment that is sensitive to the amount of darkness.
d.
translocation.
 

 16. 

The response of plants to periods of light and dark is called
a.
seasonal variation.
c.
nocturnal variation.
b.
daily activity.
d.
photoperiodism.
 

 17. 

Biennial plants may be kept alive for several years by exposing them to
a.
continuous long nights.
b.
continuous short nights.
c.
continuous cold temperatures.
d.
continuous warm temperatures.
 

 18. 

Fall coloration of leaves is caused by
a.
the breakdown of chlorophyll without the production of new chlorophyll.
b.
carotenoids and anthocyanins.
c.
a photoperiodic response.
d.
All of the above
 

 19. 

Which of the following is not a phytochrome-mediated response?
a.
flowering
c.
vernalization
b.
bud dormancy
d.
seed germination
 

 20. 

Which of the following was originally thought to perform a function now believed to be performed mainly by ethylene?
a.
abscisic acid
c.
synthetic auxin
b.
ethephon
d.
Agent Orange
 

Completion
Complete each sentence or statement.
 

 21. 

Inhibition of lateral bud growth by the presence of a shoot tip is called ____________________.
 

 

 22. 

Plant ____________________ are chemical messengers that affect a plant’s ability to respond to its environment.
 

 

 23. 

____________________ is a hormone that stimulates fruits to ripen.
 

 

 24. 

Indoleatic acid (IAA) is a type of ____________________ that allows elongation of plant cells by enabling cell walls to stretch during cell growth.
 

 

 25. 

A drought induces the production of ____________________ in leaves, causing the plant’s ____________________ to close.
 

 

 26. 

Plant growth in which the direction of growth is determined by the direction from which a stimulus comes is called a(n) ____________________.
 

 

 27. 

Plant movements that occur every night as a result of changes in turgor pressure are called ____________________ movements.
 

 

 28. 

In vernalization, exposure to ____________________ temperatures induces subsequent flowering of a plant.
 

 

 29. 

Among the fall colors that leaves exhibit when they stop producing ____________________ are the orange and yellow colors produced by carotenoids.
 

 

 30. 

Utility companies sometimes apply ____________________ to trees to prevent them from interfering with power lines.
 

 

 31. 

____________________ is a light-sensitive pigment that plants use to monitor changes in day length.
 

 



 
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