Mycorrhizae improve the nutrition of many plants by:
A) making the root cell membrane more permeable to phosphate ions.
B) masking P-fixation sites on the surface of certain soil minerals.
C) readily dissolving iron and aluminum phosphate compounds.
D) transporting phosphorus through the soil to the plant root.
E) fixing atmospheric phosphorus into forms readily used by plants.
Question 2
If the CO2 content of soil air is 3.5, it is 100 times higher than that of the atmosphere.
Indicate whether the statement is true or false