Multiple Choice
Which of the following best describes gravitropism in plants?
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37. Plant Sensation and Response
Phototropism
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Which part of a plant is most likely to exhibit negative phototropism?
A
Stem
B
Leaf
C
Flower
D
Root
Verified step by step guidance1
Understand the concept of phototropism: Phototropism is the growth response of a plant to light. Positive phototropism occurs when a plant part grows toward the light, while negative phototropism occurs when a plant part grows away from the light.
Identify the role of each plant part: The stem and leaves are typically involved in photosynthesis and are adapted to maximize light absorption, so they are more likely to exhibit positive phototropism. Flowers are reproductive structures and are not directly involved in phototropic responses.
Focus on the root: Roots are primarily responsible for anchoring the plant and absorbing water and nutrients from the soil. They do not require light for their function and often grow away from light, exhibiting negative phototropism.
Relate the behavior of roots to their environment: Roots grow deeper into the soil, where light is absent, to access water and nutrients. This behavior aligns with negative phototropism.
Conclude that the root is the plant part most likely to exhibit negative phototropism, as it grows away from light to fulfill its functional role.
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