Environmental Science
Mycorrhiza represents

Symbiotic association between a fungus and roots of higher plants
Symbiotic association between a fungus and liverworts
Parasitic association between a fungus and roots of plants
Parasitic association between a fungus and an alga

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Environmental Science
An important reason for the large daily temperature range over deserts is:

There is little water vapor in the air to absorb and re-radiate infrared radiation
Free convection cells are unable to form above the hot desert ground
Dry air is a very poor heat conductor
The light-colored sand radiates heat very rapidly at night
The ozone content of desert air is very low

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