Multiple Choice
Which term describes a plant's response to changes in day length?
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37. Plant Sensation and Response
Phototropism
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Which of the following statements best illustrates a plant tropism?
A
A sunflower bends its stem to face the direction of sunlight.
B
A Venus flytrap closes its leaves when touched.
C
A maple tree loses its leaves in autumn.
D
A cactus stores water in its thick stem.
Verified step by step guidance1
Understand the concept of tropism: Tropism is a biological phenomenon where a plant grows or moves in response to an external stimulus, such as light, gravity, or touch. It involves directional growth towards or away from the stimulus.
Analyze the first option: 'A sunflower bends its stem to face the direction of sunlight.' This describes phototropism, which is a type of tropism where plants grow or orient themselves in response to light.
Analyze the second option: 'A Venus flytrap closes its leaves when touched.' This describes thigmonasty, which is a non-directional movement in response to touch, not a tropism.
Analyze the third option: 'A maple tree loses its leaves in autumn.' This describes a seasonal adaptation called abscission, not a tropism.
Analyze the fourth option: 'A cactus stores water in its thick stem.' This describes a structural adaptation for water storage, not a tropism.
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