Multiple Choice
Which of the following plant growth responses is primarily due to the action of auxins?
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37. Plant Sensation and Response
Phototropism
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Which of the following is an example of a negative tropism related to phototropism?
A
Roots growing away from light
B
Vines climbing toward a light source
C
Leaves orienting to maximize sunlight exposure
D
Stems bending toward light
Verified step by step guidance1
Understand the concept of phototropism: Phototropism is a plant's growth response to light. Positive phototropism refers to growth toward a light source, while negative phototropism refers to growth away from a light source.
Identify the key term 'negative tropism': Negative tropism means movement or growth away from a stimulus. In this case, the stimulus is light.
Analyze each option: Evaluate whether the described behavior involves growth toward or away from light. For example, roots growing away from light would be a negative phototropism, while stems bending toward light would be a positive phototropism.
Focus on the correct example: Roots growing away from light is an example of negative phototropism because it involves growth away from the light source.
Eliminate incorrect options: Vines climbing toward a light source, leaves orienting to maximize sunlight exposure, and stems bending toward light are all examples of positive phototropism, not negative phototropism.
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