What term describes the microbial pathway that channels dissolved organic matter back into the food web via bacteria and microzooplankton?

What term describes the microbial pathway that channels dissolved organic matter back into the food web via bacteria and microzooplankton?

• A. Holoplankton
• B. Macroplankton
• C. Frustule
• D. Microbial Loop

Answer: (D)

The concept being tested is a recycling pathway in the ocean where dissolved organic matter is returned to the food web through microbial activity. Dissolved organic matter released by primary producers is taken up by bacteria, which grow and form bacterial biomass. These bacteria are then consumed by microzooplankton such as ciliates and flagellates, transferring that energy to larger zooplankton and ultimately back into the food web. This microbial loop helps keep organic carbon within the ecosystem and supports energy flow, especially in nutrient-poor waters where new inputs are limited. Holoplankton and macroplankton are groups of organisms, not processes. The frustule is the silica cell wall of diatoms, not a pathway.

The concept being tested is a recycling pathway in the ocean where dissolved organic matter is returned to the food web through microbial activity. Dissolved organic matter released by primary producers is taken up by bacteria, which grow and form bacterial biomass. These bacteria are then consumed by microzooplankton such as ciliates and flagellates, transferring that energy to larger zooplankton and ultimately back into the food web. This microbial loop helps keep organic carbon within the ecosystem and supports energy flow, especially in nutrient-poor waters where new inputs are limited.

Holoplankton and macroplankton are groups of organisms, not processes. The frustule is the silica cell wall of diatoms, not a pathway.