The CEC of a given soil horizon is determined by the relative amounts of different colloids in that soil and by the CEC of each of the colloids. O True O False
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Q: The colloids in soil are both organic and mineral in nature. O True O False
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- of this practice with respect to plant nutrition?3. WHAT IF? How would adding clay to loamy soil affectcapacity to exchange cations and retain water? Explain.Q No 5. In plants, the process of growth & development is interlinked. Justify this statement by giving suitable examples.Q No 1. Passive and active transport of nutrients is an essential phenomenon in plants. Justify this statement by giving reasonable explanation.
- Hello can you help me in figuring this one. Thankyou!! Using the diagram in the given picture, explain the concept of topographic age on soil development.SCIENTIFIC INQUIRY • INTERPRET THE DATA A Minnesotagardener notes that the plants immediately bordering a walkwayare stunted compared with those farther away. Suspectingthat the soil near the walkway may be contaminated from saltadded to the walkway in winter, the gardener tests the soil. Thecomposition of the soil near the walkway is identical to thatfarther away except that it contains an additional 50 mM NaCl.Assuming that the NaCl is completely ionized, calculate howmuch it will lower the solute potential of the soil at 20°C usingthe solute potential equation:ΨS = -iCRTwhere i is the ionization constant (2 for NaCl), C is themolar concentration (in mol/L), R is the pressure constant[R = 0.00831 (L · MPa)/(mol · K)], and T is the temperature inKelvin (273 + °C).How would this change in the solute potential of the soilaffect the water potential of the soil? In what way would thechange in the water potential of the soil affect the movementof water in or out of the roots?Nitrogen deficiency stunts plant growth and causes leaves to turn yellow and then die. Why does nitrogen deficiency cause these symptoms? Hint: Think about which biological molecules incorporate nitrogen atoms.
- 7. Soil X is low in native N is planted with sunflower, nitrate fertilizer is added to the soil, pH is measured and you observed an increase in pH, which of the following processes is most likely responsible for the increase in soil pH? A. Release of OH- of plant roots upon uptake of nitrate B. Release of Ca++ of roots upon uptake of nitrate C. Release of COOH- of plant roots upon uptake of nitrate D. Release of H+ of plant roots upon uptake of nitrate21. Which statement is true regarding plants and soil nutrition? a. Soil plays an important role in filtering pollutants b. only macronutrients are essential for plant growth c. Potassium is a critical mineral for plants because it is a component of ATP d. Organic matter is the least abundant component of soil e. stunting is yellowing of tissue due to mineral difficiency15. What process is responsible for the increase in the total negative charge as soil pH increases? A. Dehydration reaction B. Deprotonation C. Protonation D. H+ bond formation
- Give answer to all parts? 1. Why might a soil bacteria (Azotobacter) have the ability to fluoresce? How does fluorescence differ from being pigmented. 2. What are the means by which soil can be depleted of useable forms of nitrogen?SCIENTIFIC INQUIRY Acid precipitation has an abnormallyhigh concentration of hydrogen ions (H+). One effect ofacid precipitation is to deplete the soil of nutrients suchas calcium (Ca2+), potassium (K+), and magnesium (Mg2+).Suggest a hypothesis to explain how acid precipitationwashes these nutrients from the soil. How might you testyour hypothesis?Select all that are true regarding soil a. the most abundant element of soil is inorganic mater b. plants passively acquire cations by using ATP to pump H+ into the soil c. soil plays key roles in water regulation and buffering of pollutants d. soil is an essential source of carbon for plants e. plants use H+ from photosynthesis to acquire cations f. anions are unbound in the soil and freely travel into plant roots with water g. cation exchange is required because cations are bound to negatively charged soil particles h. H+ works well for the cation exchange because it is a small molecule with a strong charge 2. Select all that apply to plant nutrition a. green manure can restore minerals to soil but is to expensive for farmers to use b. mineral deficiencies cause symptoms like chlorosis, a browning and death of plant tissue c. fertilizers typically contain nitrogen, potassium, and phosphorus,…
