Soil Worksheet-5

Soil Worksheet-5

Multiple-Choice Question:

41. Soil acidity is measured by the concentration of which cation?

(A) Sodium                                       (B) Magnesium            

(C) Hydrogen                                   (D) Calcium

42. The E horizon is typically found:

(A) beneath the B horizon              (B) above the O horizon

(C) beneath the A horizon              (D) beneath the C horizon

43. A soil with a dark brown or black colour is indicative of:

(A) poor drainage                 

(B) good drainage                 

(C) considerable organic matter content

(D) excessive leaching

44. The smallest soil particles are:

(A) clay                (B) pebbles         (C) gravel             (D) sand

45. Which of the following factor is most important in determining soil characteristics?

(A) the vegetation cover                 (B) climate          

(C) type of bedrock                          (D) topography

46. Which of the following is a correct list of contents of the organic material in soil?

(A) roots and small animals          

(B) small animals, humus, and roots

(C) humus, roots, and decomposed material

(D) minerals, small animals, and roots

47. Which of the following human activities has resulted in increased rates of weathering?

(A) destruction of forests               

(B) the release of sulphur and nitrogen oxides that cause acid rain.

(C) the physical disintegration of rocks during construction and mining.

(D) All of these

48. Which of the following conditions promote slow chemical weathering?

(A) high rainfall                                (B) cold temperatures          

(C) fracturing                                    (D) thick soils

49. Which of the following factors would increase the chemical weathering rate?

(A) increasing temperature            (B) increasing organic activity

(C) increasing rainfall                      (D) all of these

50. Which of the following minerals would be most likely to form a clay mineral during chemical weathering?

(A) mica               (B) quartz            (C) iron oxide      (D) calcite

Answer Key:

41. (C)
42. (C)
43. (C)
44. (A)
45. (B)
46. (A)
47. (D)
48. (B)
49. (D)
50. (A)