Biology (Raven), 10th Edition

Chapter 38: Plant Nutrition and Soils

Pre-Test

1
Which of these is NOT a major constituent of soil?
A)organic matter
B)chlorophyll
C)water
D)air
E)organisms
2
What is the membrane potential created in roots by proton pumps that pump out hydrogen ions, creating an electrochemical gradient that draws mineral ions into the roots?
A)-160 mV
B)+160 mV
C)-60 mV
D)+60 mV
E)None of the choices are correct.
3
Which of the following is a benefit that nitrogen fixing bacteria get from the plants they assist?
A)nitrogen
B)amino acids
C)protection
D)carbohydrates
E)water
4
Elevated temperature can affect _____ in plants.
A)nitrogen levels
B)carbon levels
C)respiration
D)amino acids
E)carbon levels and respiration are correct
5
Poplar trees have been shown to be important in the phytoremediation of what environmental contaminant?
A)trichloroethylene
B)trinitrotoluene
C)heavy metals
D)radioactive elements
E)medical waste
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