Which of the following describes organisms that digest dead matter and organic waste, acting as detritivores?

• A. Detritivores
• B. Autotrophs
• C. Fungi
• D. Protists

Answer: (A)

Detritivores are organisms that feed on detritus—dead plant and animal matter and other organic waste—and physically ingest it, breaking it down as they consume. This ingested material is then further decomposed, recycling nutrients back into the ecosystem.

Autotrophs are producers that manufacture organic molecules from inorganic carbon, using light or chemical energy, not feeding on detritus. Fungi decompose by external digestion: they secrete enzymes onto dead material and absorb the nutrients, rather than ingesting the solid matter. Protists include diverse lifestyles, and some can be detritivores, but the term detritivores best describes organisms that actively ingest and digest detritus.