Mycorrhizae improve the nutrition of many plants by ________
A) masking P-fixation sites on the surface of certain soil minerals
B) making the root cell membrane more permeable to phosphate ions
C) transporting phosphorus through the soil to the plant root
D) fixing atmospheric phosphorus into forms readily used by plants
E) readily dissolving iron and aluminum phosphate compounds
C
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Portland cement is a _____ cement, which means that it sets and hardens by a chemical reaction with water.
A. hydraulic B. natural C. hydrated D. lime-sand
A computer password consists of eight characters.
a. How many different passwords are possible if each character may be any lowercase letter or digit? b. How many different passwords are possible if each character may be any lowercase letter or digit, and at least one character must be a digit? c. A computer system requires that passwords contain at least one digit. If eight characters are generated at random, and each is equally likely to be any of the 26 letters or 10 digits, what is the probability that a valid password will be generated?
Atmospheric pressure in inches of mercury (in. Hg) decreases ____________________ in. per 1000 feet increase in elevation.
Fill in the blank(s) with the appropriate word(s).
Define the following terms:
a. Extruder b. Screener c. Bin d. Conveyor e. Feeder f. Hopper