ISA Certified Arborist Practice Exam 2025 – All-in-One Resource for Comprehensive Exam Success!

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What role do trees play in nutrient cycling within an ecosystem?

They act as sediment traps

They produce and decay organic matter

Trees play a vital role in nutrient cycling by producing and decaying organic matter. Through the process of photosynthesis, trees create organic compounds that serve as food for various organisms in the ecosystem. When leaves and other plant materials fall to the ground, they decompose, enriching the soil with nutrients. This breakdown of organic matter is a crucial component of nutrient cycling, as it returns essential elements like nitrogen, phosphorus, and potassium back to the soil, making them available for uptake by other plants.

The decay process also supports a diverse community of microorganisms and fungi, which contribute further to the breakdown of organic matter and the cycling of nutrients. This dynamic interaction enhances soil fertility, promotes plant growth, and sustains the health of the overall ecosystem, illustrating the integral function trees serve beyond just being a source of structural support and habitat.

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They filter pollutants

They primarily grow in nutrient-poor areas

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