Which of the following best describes the matter present in an ecosystem?

• A. Matter cycles between the biotic and abiotic components of the ecosystem.
• B. Matter flows in one direction and is lost from the ecosystem.
• C. Matter only exists in the biotic components of the ecosystem.
• D. Matter is constantly created and destroyed within the ecosystem.

Answer: (A)

Verified step by step guidance

1. Understand the concept of matter cycling in ecosystems: Matter refers to substances like carbon, nitrogen, and water that are essential for life. These substances move between living organisms (biotic components) and non-living elements (abiotic components) in a continuous cycle.
2. Recognize that matter is not lost or destroyed in ecosystems: Matter is conserved according to the law of conservation of mass. It is transformed and recycled, but it does not flow in one direction or disappear from the ecosystem.
3. Identify the role of biotic and abiotic components: Biotic components include living organisms like plants, animals, and microbes, while abiotic components include soil, water, air, and sunlight. Matter cycles between these components through processes like photosynthesis, decomposition, and nutrient uptake.
4. Clarify that matter is not created or destroyed: Matter in ecosystems is recycled through natural processes such as the water cycle, carbon cycle, and nitrogen cycle. It is not created or destroyed but transformed into different forms.
5. Conclude that the best description of matter in an ecosystem is: 'Matter cycles between the biotic and abiotic components of the ecosystem,' as this aligns with scientific principles and ecological processes.