Unit 6 - Practice Quiz

1 In the USDA Soil Taxonomy, which category represents the highest level of generalization?

2 Which of the following is the lowest and most specific category in the USDA Soil Taxonomy?

3 A diagnostic surface horizon is technically referred to as a(n):

4 Which epipedon is characterized by being thick, dark-colored, high in organic matter, and having a base saturation of greater than ?

5 Which soil order is characterized by soils that have permafrost within 100 cm of the soil surface?

6 Soils derived from volcanic ash and cinders, characterized by low bulk density and high phosphate retention, belong to which order?

7 Which soil order represents the 'Black Cotton Soils' of India, known for their shrinking and swelling properties?

8 Which diagnostic subsurface horizon is characterized by a significant accumulation of silicate clays?

9 In the nomenclature of Soil Taxonomy, the formative element 'oll' indicates which soil order?

10 Which soil order consists of organic soils, such as peats and mucks, with more than organic matter?

11 The most extensive soil group found in India is:

12 Which soil order represents the most highly weathered soils, rich in iron and aluminum oxides, typically found in tropical rainforests?

13 A soil with a 'Cambic' horizon is generally classified under which order, assuming no other more advanced diagnostic horizons exist?

14 The Umbric epipedon differs from the Mollic epipedon primarily because the Umbric epipedon has:

15 Which formative element corresponds to the soil order Entisols?

16 In India, the 'Regur' soils are best suited for the cultivation of:

17 Which horizon is characterized by the accumulation of illuvial humus and aluminum (with or without iron)?

18 The red color of Red Soils in India is primarily due to the presence of:

19 Which soil order is defined as having no diagnostic horizons (except perhaps an Ochric epipedon) due to recent deposition or active erosion?

20 The 'Khadar' and 'Bhangar' classifications relate to which soil type in India?

21 A subsurface horizon rich in sodium, with columnar or prismatic structure, is called:

22 Which soil temperature regime implies a mean annual soil temperature of to ?

23 Laterite soils in India are formed primarily through the process of:

24 The primary difference between Alfisols and Ultisols is based on:

25 Which of the following is a 'light-colored' epipedon with low organic matter, common in arid soils?

26 The phenomenon of 'self-ploughing' is a characteristic feature of which Indian soil?

27 Which soil moisture regime indicates the soil is saturated with water for long periods, leading to anaerobic conditions (gleying)?

28 In Soil Taxonomy, the category 'Great Group' is formed by adding a prefix to the name of the:

29 Peaty and Marshy soils in India, known as 'Kari' soils, are predominantly found in:

30 Which soil order is most commonly found in arid and semi-arid regions and has limited soil moisture available for plant growth?

31 The dominant clay mineral present in Vertisols (Black Soils) is:

32 A soil profile description 'Fine-loamy, mixed, superactive, mesic Typic Hapludalf' represents a name at which category level?

33 The 'Albic' horizon is best described as:

34 Which state in India has the largest area under Saline and Alkaline soils?

35 Features such as slickensides and gilgai microrelief are diagnostic of:

36 Which soil order name contains the formative element 'od'?

37 The diagnostic horizon 'Calcic' indicates an accumulation of:

38 Karewa soils, famous for Saffron cultivation, are found in:

39 In the naming of the suborder 'Aqualf', the prefix 'Aqu' refers to:

40 Which diagnostic horizon is cemented by silica?

41 Which of the following Indian soil types is generally deficient in Nitrogen, Phosphorus, and Humus?

42 The 'Xeric' moisture regime is characteristic of which climate?

43 What is the approximate publication year of the comprehensive 'Soil Taxonomy' (USDA Handbook 436)?

44 Red soils generally have a texture varying from:

45 Which epipedon is characterized by modification due to human activity, such as long-term manuring?

46 The dominant clay mineral in Red Soils is:

47 Which soil order typically forms under coniferous forests in cool, moist climates and has an acidic, ash-like E horizon?

48 The suffix 'p' in a soil horizon designation (e.g., Ap) indicates:

49 Which of the following diagnostic horizons is considered an 'Endopedon'?

50 The process of 'Podzolization' leads to the formation of which soil order?