Chapter 29 - Chapter 29 Plant Nutrition and Soils...

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Chapter 29: Plant Nutrition and Soils Multiple-Choice Questions 1. Essential Elements; p. 646 and Table 29-1; easy; ans: d Which of the following is NOT an essential element? a. Molybdenum b. Copper c. Iron d. Aluminum e. Chlorine 2. Essential Elements; p. 646; moderate; ans: a Which of the following is NOT a criterion for an element to be considered essential for plant growth? a. It is present in plant tissues. b. In its absence the plant shows deficiency symptoms. c. It is part of a molecule that is essential to the plant. d. It is needed by the plant to produce viable seed. e. It is needed by the plant to complete its life cycle. 3. Essential Elements; p. 647; easy; ans: c A micronutrient is a plant nutrient required in concentrations equal to or less than ______ mg per kg of dry matter. a. 1 b. 10 c. 100 d. 1000 e. 10,000 4. Essential Elements; p. 647 and Table 29-1; easy; ans: d Which of the following is NOT a micronutrient? a. Zinc b. Copper c. Manganese d. Calcium e. Nickel
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2 Chapter 29 Plant Nutrition and Soils 5. Essential Elements; p. 647; easy; ans: d A macronutrient is a plant nutrient required in concentrations greater than or equal to ______ mg per kg of dry matter. a. 1 b. 10 c. 100 d. 1000 e. 10,000 6. Essential Elements; p. 647; moderate; ans: b Eudicots generally require greater amounts of ______ than do monocots. a. magnesium and calcium b. calcium and boron c. boron and manganese d. manganese and zinc e. zinc and cobalt 7. Essential Elements; p. 647; moderate; ans: e Legumes grown in culture benefit from the addition of cobalt because the cobalt: a. inhibits the growth of pathogenic bacteria. b. stimulates cell division of the apical meristem. c. stimulates the growth of root cells. d. is required by mycorrhizae. e. is required by symbiotic nitrogen-fixing bacteria. 8. Functions of Essential Elements; p. 649; easy; ans: a In plants, necrosis is the: a. localized death of tissues. b. yellowing of leaves. c. loss of chlorophyll. d. development of tumors. e. healing of wounds. 9. Functions of Essential Elements; p. 649; difficult; ans: c In magnesium-deficient plants, older leaves become more severely chlorotic than younger leaves because: a. magnesium is less phloem-mobile than chlorophyll. b. magnesium is more phloem-mobile than chlorophyll. c. younger leaves withdraw magnesium from older leaves. d. older leaves withdraw magnesium from younger leaves. e. magnesium is more mobile in younger leaves than in older leaves.
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Chapter 29 Plant Nutrition and Soils 3 10. Functions of Essential Elements; p. 649; easy; ans: c Which of the following is NOT a phloem-mobile element? a. Nitrogen b. Magnesium c. Iron d. Potassium e. Phosphorus 11. Functions of Essential Elements; p. 649; difficult; ans: a A deficiency of ______ is MOST likely to produce symptoms in younger leaves before older leaves. a. boron b. potassium c. manganese d. copper e. zinc 12. The Soil; p. 650; easy; ans: b Humus consists mostly of: a. living organic matter.
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