What is the principal substance that mediates phototropism in stems?
A) auxin
B) gibberellin
C) abscisic acid
D) ethylene
E) cytokinin
Correct Answer:
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Q37: When monocots, such as rice and oats,
Q38: Almost all houseplants, woody ornamentals, and orchard
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
Q43: In contrast to most other plant hormones,
Q44: On a hot, dry day a plant
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
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