Which service category includes photosynthesis and nutrient cycling?

• A. Provisioning services
• B. Regulating services
• C. Supporting services
• D. Cultural services

Answer: (C)

The main idea here is that some ecosystem processes are foundational to all services, enabling every other function an ecosystem provides. Photosynthesis and nutrient cycling are exactly these kinds of underlying processes.

Photosynthesis captures light energy and converts it into chemical energy stored in biomass, forming the base of most food webs and supporting plant growth. Nutrient cycling moves essential elements like carbon, nitrogen, and phosphorus through air, water, soil, and organisms, keeping soils fertile and ecosystems productive. Together, these processes maintain the structure and functioning of ecosystems, so they underpin the ability of an ecosystem to deliver all other services.

That’s why they’re classified as supporting services: they sustain the ecosystem itself and enable provisioning, regulating, and cultural services to occur. They aren’t direct tangible products (provisioning) or specific regulatory outcomes (regulating), nor are they human-centered benefits (cultural). They provide the essential groundwork that makes all other services possible.