Nutritional Requirements of Plants |
1. | Describe the ecological role of plants in transforming inorganic molecules into organic compounds. |
2. | Define the term essential nutrient. |
3. | Explain how hydroponic culture is used to determine which minerals are essential nutrients. |
4. | Distinguish between macronutrient and micronutrient. |
5. | Name the nine macronutrients required by plants. |
6. | List the eight micronutrients required by plants and explain why plants need only minute quantities of these elements. |
7. | Explain how a nutrient’s role and mobility determine the symptoms of a mineral deficiency. |
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| The Role of Soil in Plant Nutrition |
8. | Define soil texture and soil composition. |
9. | Explain how soil is formed. |
10. | Name the components of topsoil. |
11. | Describe the composition of loams and explain why they are the most fertile soils. |
12. | Explain how humus contributes to the texture and composition of soils. |
13. | Explain why plants cannot extract all of the water in soil. |
14. | Explain how the presence of clay in soil helps prevent the leaching of mineral cations. |
15. | Define cation exchange, explain why it is necessary for plant nutrition, and describe how plants can stimulate the process. |
16. | Explain why soil management is necessary in agricultural systems but not in natural ecosystems such as forests and grasslands. Describe an example of human mismanagement of soil. |
17. | List the three mineral elements that are most commonly deficient in agricultural soils. |
18. | Explain how soil pH determines the effectiveness of fertilizers and a plant’s ability to absorb specific mineral nutrients. |
19. | Describe problems resulting from farm irrigation in arid regions. |
20. | Describe actions that can reduce loss of topsoil due to erosion. |
21. | Explain how phytoremediation can help detoxify polluted soil. |
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| The Special Case of Nitrogen as a Plant Nutrient |
22. | Define nitrogen fixation and write an overall equation representing the conversion of gaseous nitrogen to ammonia. |
23. | Explain the importance of nitrogen-fixing bacteria to life on Earth. |
24. | Summarize the ecological role of each of the following groups of bacteria. a. ammonifying bacteria b. denitrifying bacteria c. nitrogen-fixing bacteria d. nitrifying bacteria |
25. | Explain why improving the protein yield of crops is a major goal of agricultural research. |
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| Nutritional Adaptations: Symbiosis of Plants and Soil Microbes |
26. | Describe the development of a root nodule in a legume. |
27. | Explain how a legume protects its nitrogen-fixing bacteria from free oxygen, and explain why this protection is necessary. |
28. | Describe the basis for crop rotation. |
29. | Explain why a symbiosis between a legume and its nitrogen-fixing bacteria is considered to be mutualistic. |
30. | Explain why a symbiosis between a plant and a mycorrhizal fungus is considered to be mutualistic. |
31. | Distinguish between ectomycorrhizae and endomycorrhizae. |
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| Nutritional Adaptations: Parasitism and Predation by Plants |
32. | Name one modification for nutrition in each of the following groups of plants: a. epiphytes b. parasitic plants c. carnivorous plants |
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