Biology: The Dynamics of Life, California Edition

Section 3: Plant Responses

Plant Responses

1.
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What can you infer from this illustration?
A)The plant is demonstrating phototropism.
B)The plant is demonstrating thigmotropism.
C)The plant does not have enough water.
D)The plant is demonstrating hydrotropism.
2.
Which plant hormone is involved in the fruit ripening process?
A)ethylene
B)auxins
C)gibberellins
D)cytokinins
3.
Fruit growers can use auxins to __________.
A)enhance fruit formation
B)delay fruit formation
C)accelerate mitosis
D)speed ripening
4.
What affect on plants do cytokinins cause?
A)They speed up the fruit ripening process.
B)They promote cell elongation.
C)They stimulate cell division and mitosis.
D)They increase the rate of bud development.
5.
Which of these statements is NOT true?
A)Tropisms are always completely reversible.
B)A negative tropism means the plant grows away from the stimulus.
C)Nastic movements are plant responses that are not dependent on the direction of the stimulus.
D)Growth response to touch is known as thigmotropism.
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