Author Question: In most soils the overall population (numbers) of microorganisms changes with time, generally ... (Read 140 times)

nramada · **on:** Jul 22, 2018

In most soils the overall population (numbers) of microorganisms changes with time, generally following changes in the ________.

A) concentrations of antibiotics
B) availability of root infection sites
C) porespace
D) supply of oxygen
E) supply of decomposable organic matter

Question 2

Vesicles and arbuscules are structures typically formed ________.

A) in bacterial cells when attacked by protozoa.
B) in root cells by fungi when they form mycorrhizae
C) above ground by certain soil fungi
D) by mesofauna when they incorporate organic materials into the soil
E) none of the above