On a hot, dry day a plant closes its stomata thereby conserving water. Which plant hormone is responsible for the closing of the stomata?
A) auxin
B) gibberellin
C) ethylene
D) cytokinin
E) abscisic acid
Correct Answer:
Verified
Q39: The embryonic shoot and root are separated
Q40: Quaking aspen trees reproduce vegetatively by _.
A)suckers
B)corms
C)bulbs
D)tubers
E)rhizomes
Q41: Which of the following chemicals is used
Q42: What is the principal substance that mediates
Q43: In contrast to most other plant hormones,
Q45: What plant hormone has a central role
Q46: Bananas are propagated by _.
A)grafting
B)adventitious roots
C)tissue culture
D)treating
Q47: The binding of a plant hormone to
Q48: How many varieties of apples account for
Q49: The plant hormone that coordinates the effects
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