Multiple Choice
As you move geographically from the polar regions to the equator, species diversity:
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48. Ecology
Introduction to Ecology
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Which of the following is the greatest limiting factor for plants that grow on the floor of a rain forest?
A
Amount of carbon dioxide
B
Availability of sunlight
C
Wind speed
D
Soil temperature
Verified step by step guidance1
Understand the context: Plants growing on the floor of a rainforest face unique challenges due to the dense canopy above them. The canopy blocks much of the sunlight, which is essential for photosynthesis.
Recall the process of photosynthesis: Plants use sunlight, carbon dioxide, and water to produce glucose and oxygen. Sunlight is a critical energy source for this process, and without sufficient light, photosynthesis cannot occur efficiently.
Evaluate the options: Consider each factor listed in the problem. Carbon dioxide is generally abundant in the atmosphere, even in rainforests. Wind speed is not a significant factor for photosynthesis or plant growth in this context. Soil temperature can influence root function but is not the primary limiting factor for plants on the rainforest floor.
Focus on sunlight: The availability of sunlight is the greatest limiting factor for plants on the rainforest floor because the dense canopy above blocks much of the light. Without adequate sunlight, plants struggle to perform photosynthesis and grow.
Conclude: Based on the ecological conditions of the rainforest and the requirements for photosynthesis, the correct answer is the availability of sunlight.
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