Self Quiz

1. Macronutrients a. are so called because they are more essential than micronutrients.

b. include manganese, boron, and zinc, among others.

c. function as catalysts.

d. are required in concentrations of at least 1 gram per kilogram of plant dry matter.

e. are obtained by the process of photosynthesis.

2. Which of the following is not an essential mineral element for plants?

a. Potassium b. Magnesium c. Calcium d. Lead e. Phosphorus

3. Fertilizers a. are often characterized by their N-P-O percentages.

b. are not required if crops are removed frequently enough.

c. restore needed mineral nutrients to the soil.

d. are needed to provide carbon, hydrogen, and oxygen to plants.

e. are needed to destroy soil pests.

4. In a typical soil, a. the topsoil tends to lose mineral nutrients by leaching.

b. there are four or more horizons.

c. the C horizon consists primarily of loam.

d. the dead and decaying organic matter gathers in the B horizon.

e. more clay means more air space and thus more oxygen for roots.

5. Which of the following is not an important step in soil formation?

a. Removal of bacteria b. Mechanical weathering c. Chemical weathering d. Clay formation e. Hydrolysis of soil minerals

6. Nitrogen fixation is a. performed only by plants.

b. the oxidation of nitrogen gas.

c. catalyzed by the enzyme nitrogenase.

d. a single-step chemical reaction.

e. possible because N2 is a highly reactive substance.

7. Nitrification is a. performed only by plants.

b. the reduction of ammonium ions to nitrate ions.

c. the reduction of nitrate ions to nitrogen gas.

d. catalyzed by the enzyme nitrogenase.

e. performed by certain bacteria in the soil.

8. Nitrate reduction a. is performed by plants.

b. takes place in mitochondria.

c. is catalyzed by the enzyme nitrogenase.

d. includes the reduction of nitrite ions to nitrate ions.

e. is known as the Haber process.

9. Which of the following is a parasite?

a. Venus flytrap b. Pitcher plant c. Sundew d. Dodder e. Tobacco

10. All carnivorous plants a. are parasites.

b. depend on animals as a source of carbon.

c. are incapable of photosynthesis.

d. depend on animals as their sole source of phosphorus.

e. obtain supplemental nitrogen from animals.

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Essentials of Human Physiology

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