1 .		Which of the following statements is (are) correct regarding micronutrients? [Hint]   "micronutrients" can also be called "trace elements," but the latter term is considered obsolete for this usage   micronutrients are so called because they are less important for plant growth than macronutrients   there may be little difference between deficient levels in plant tissue and toxic levels in plant tissue for certain micronutrients   many of the micronutrients are important in enzyme function in plants   answers 1, 3, and 4 above are all correct
2 .		Which of the following are sources of micronutrients? [Hint]   igneous rocks   horse manure   decomposing soil organic matter   all of the above   none of the above
3 .		+The micronutrients iron, manganese, and zinc are all ________. [Hint]   anions in the soil solution   cations in the soil solution   made more available at low pH   both answers 2 and 3 above are true   both answers 1 and 3 above are correct
4 .		+Which of the following is NOT likely to influence micronutrient availability? [Hint]   addition of chicken manure to the soil   addition of iron sulfate to the soil.   innoculation with Rhizobium bacteria.   installation of a drainage system in a flooded soil   application of lime (calcium carbonate) to the soil
5 .		+Chelates are important in the regulation of micronutrient availability because they __________. [Hint]   lower soil pH to increase micronutrients solubility   combine with micronutrients to maintain them in a soluble form   form permanent (irreversible) bonds with micronutrients that keep micronutrients in organic complexes until the organic molecule is decomposed   are responsible for the formation of secondary minerals   join micronutrient anions to micronutrient cations and double the efficiency of micronutrient uptake
6 .		Which anionic plant micronutrient becomes more available at low pH and is rather easily leached from sandy soils? [Hint]   iron   chlorine   molybdenum   boron   selenium
7 .		Trace elements, whether micronutrients for plants or not, may also cause toxicity in animals and humans. Which of the following trace elements have demonstrated a potential for adverse effects on animal and human health? [Hint]   magnesium   chromium   arsenic   chlorine   both answers 2 and 3 above are correct
8 .		+A young corn crop growing on an acid, sandy soil with high P content has broad white bands on both sides of the midrib. What is (are) the likely cause(s) of this symptom? [Hint]   molybdenum toxicity   zinc toxicity   zinc deficiency   chelation of iron   both answers 1 and 4 above are correct
9 .		Which statement(s) about the application of micronutrients is (are) true? [Hint]   micronutrients are commonly applied directly to plant leaves   the doses applied generally must be greater as a foliar spray than as a soil fertilizer.   micronutrients may be applied in the form of glassy beads called frits   both answers 1 and 3 above are correct   both answers 1 and 2 above are correct
10 .		Which of the following is (are) important in managing micronutrient fertility in soils? [Hint]   control of drainage   liming practices   choice of crop   knowledge of soil minerals   all of the above