Most Organic Matter Found in Soils Results from Primary Producers

Question

Most organic matter found in soils results from primary producers such as ________.
A)cyanobacteria
B)vascular plants
C)photosynthetic protists
D)None of the choices are correct.

Accepted Answer

Vascular plants are the primary producers that contribute the most organic matter to soils. Cyanobacteria and photosynthetic protists can also contribute to organic matter, but their contribution is generally smaller compared to vascular plants.