Multiple Choice
Which of the following best explains why government-sanctioned activities to improve ecosystems have often had little effect?
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48. Ecology
Introduction to Ecology
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In a pyramid of numbers, why can trees be considered producers but still represent the smallest trophic level?
A
Because trees reproduce more slowly than animals, leading to fewer individuals.
B
Because a single tree can support many herbivores, resulting in fewer producers than consumers.
C
Because trees are less efficient at photosynthesis compared to other plants.
D
Because trees are at the top of the food chain and have fewer predators.
Verified step by step guidance1
Understand the concept of a pyramid of numbers: A pyramid of numbers represents the number of organisms at each trophic level in an ecosystem. Producers (like plants) form the base, while consumers (herbivores and carnivores) occupy higher levels.
Recognize that trees are producers: Trees are autotrophs that use photosynthesis to convert sunlight into energy, forming the base of the food chain.
Analyze why trees might represent the smallest trophic level: A single tree can support many herbivores (e.g., insects, birds, or mammals) by providing food and habitat. This results in fewer producers (trees) compared to the number of consumers (herbivores).
Eliminate incorrect options: Trees reproducing slowly, being less efficient at photosynthesis, or being at the top of the food chain are not valid reasons for their representation in the pyramid of numbers.
Conclude that the correct explanation is: A single tree can support many herbivores, leading to fewer producers than consumers in the pyramid of numbers.
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