How do microorganisms affect humus and thereby soil health? a. the presence of any microorganisms causes the destruction of humus, which leads to a reduction in soil health. b. microorganisms increase the production of humus, which leads to a decrease in soil health. c. microorganisms increase the production of humus, which leads to an increase in soil health. d. microorganisms exist independently of humus and therefore do not affect soil health.

The correct answer is (C) Microorganisms increase the production of humus, which leads to an increase in soil health.

Successive decomposition of organic matter leads to the formation of humus.  Microorganism present in the soil speeds up the rate of decomposition of organic matter.  Different products such as carbon dioxide, nutrients are released in the soil that contributes in soil health. This is called as Humification. This makes the soil color dark and increases the ability to retain nutrients in it. Humification also increases the level of phosphorous and nitrogen in the soil.

it would be c. xylem.

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