Unit 2 - Practice Quiz

1 Which of the following processes describes the conversion of organic nitrogen into plant-available inorganic forms ()?

2 In the process of nitrification, which bacteria are primarily responsible for oxidizing ammonium () to nitrite ()?

3 Under anaerobic conditions, nitrate () is reduced to gaseous nitrogen forms (). What is this process called?

4 Which form of nitrogen is most susceptible to leaching losses in soil due to its negative charge repelling soil colloids?

5 Ammonia volatilization is represented by which of the following chemical equilibria?

6 At what C:N ratio does net immobilization of nitrogen generally occur in the soil?

7 Which enzyme is essential for biological nitrogen fixation to break the triple bond of dinitrogen ()?

8 What is the dominant ionic form of phosphorus available to plants in acidic soils (pH < 6.0)?

9 In highly acidic soils, phosphorus availability is primarily limited by fixation with which elements?

10 In alkaline or calcareous soils, phosphorus fixation occurs primarily through the formation of insoluble compounds with:

11 The movement of phosphorus from soil to plant roots occurs primarily via:

12 Which clay mineral is most associated with the fixation of Potassium () in its interlayers?

13 Potassium is absorbed by plants primarily as:

14 The concept of 'Luxury Consumption' is most commonly associated with which macronutrient?

15 Which form of Calcium is part of the cation exchange capacity (CEC) and easily available to plants?

16 The primary mechanism for Calcium and Magnesium transport to plant roots is:

17 Magnesium acts as the central atom in which vital plant molecule?

18 In which form is Sulphur primarily absorbed by plant roots?

19 The transformation of elemental sulfur () to sulfate () in soil is an oxidation process primarily carried out by:

20 Which nutrient is a structural component of the amino acids cysteine, cystine, and methionine?

21 Micronutrients are generally most available to plants in which pH range?

22 Which micronutrient is unique because its availability increases as soil pH increases (becomes more alkaline)?

23 Iron deficiency in plants, often observed in calcareous soils, is commonly known as:

24 Which organic compounds are commonly used in fertilizers to prevent metal micronutrients (like Fe, Zn) from precipitating in the soil?

25 Boron is primarily absorbed by plants in the form of:

26 Which micronutrient is essential for the synthesis of the plant hormone auxin (Indole Acetic Acid)?

27 The reduction of Manganese from (insoluble) to (soluble) is favored by which soil condition?

28 Which form of Chlorine is absorbed by plants?

29 Nickel () is the most recently classified essential micronutrient. It is a critical component of which enzyme?

30 An antagonistic relationship exists between Phosphorus () and which micronutrient, where high P levels can induce a deficiency?

31 The term 'Mulder's Chart' refers to:

32 High levels of Potassium () fertilizer often induce a deficiency in which secondary nutrient due to cation competition?

33 Which ratio is often analyzed to assess the potential for Potassium availability relative to other cations?

34 What happens to Phosphorus availability in soil if Calcium Carbonate () is added in excess?

35 Copper () binds very tightly to which soil component, often leading to deficiency in peat or muck soils?

36 Which nutrient interaction is generally considered Synergistic?

37 The conversion of organic Sulfur to inorganic Sulfate is dependent on:

38 What is the oxidation state of Iron in the ferrous form, which is absorbed by plants?

39 Which of the following equations represents the hydrolysis of Urea in the soil?

40 Phosphorus moves through the soil solution to the root surface primarily over distances of:

41 Which of the following soil colloid types has the highest affinity for specifically adsorbing Phosphate anions?

42 Manganese toxicity is most likely to occur in:

43 The 'Quantity/Intensity' (Q/I) relationship is typically used to describe the buffering capacity of which nutrient?

44 Which anion is known to competitively inhibit the uptake of Molybdenum?

45 The structural lattice of chlorophyll contains 4 Nitrogen atoms and 1 Magnesium atom. This highlights the importance of N-Mg interaction in:

46 In the context of nutrient movement, 'Mass Flow' relies primarily on:

47 Which element is involved in osmoregulation and stomatal opening/closing?

48 The primary reservoir of Nitrogen in most surface soils is:

49 Which nutrient is required for the synthesis of the enzyme urease?

50 Soluble salts in soil can impede water uptake. Which interaction explains the mitigation of sodium () toxicity by adding Calcium ()?