Which process is part of matter cycling in ecosystems?

Which process is part of matter cycling in ecosystems?

• A. Decomposition
• B. Photosynthesis
• C. Energy transfer
• D. Predation

Answer: (A)

Matter cycling in ecosystems is about nutrients moving through living things and their environment and being reused rather than disappearing as energy. Decomposition is the process where dead organisms and waste are broken down by decomposers into simpler inorganic nutrients. These nutrients return to soil or water and become available for plants to take up, continuing the cycle. Without this breakdown, nutrients would stay locked in dead material and producers couldn’t access them to support growth. Photosynthesis, while essential for converting energy and building organic matter, doesn’t by itself recycle nutrients. Energy transfer describes how energy moves through trophic levels and is lost as heat, not about recycling matter. Predation affects population dynamics and energy flow, but it doesn’t directly restore nutrients to the environment.

Matter cycling in ecosystems is about nutrients moving through living things and their environment and being reused rather than disappearing as energy. Decomposition is the process where dead organisms and waste are broken down by decomposers into simpler inorganic nutrients. These nutrients return to soil or water and become available for plants to take up, continuing the cycle. Without this breakdown, nutrients would stay locked in dead material and producers couldn’t access them to support growth.

Photosynthesis, while essential for converting energy and building organic matter, doesn’t by itself recycle nutrients. Energy transfer describes how energy moves through trophic levels and is lost as heat, not about recycling matter. Predation affects population dynamics and energy flow, but it doesn’t directly restore nutrients to the environment.