Q. 41. The bacteria considered most important to bring about the conversion of NH4 to NH2
a) Nitrosomonas
b) Nitrobacteria
c) Azotobacter
d) Both a & b
d) Both a & b
Q. 42. Which of the following soils has higher buffering capacity
a) Sandy soils
b) Loamy soil
c) Loamy sand
d) Clay soils
d) Clay soils
Q. 43. The manifestation of the physical forces of cohesion and adhesion acting within the soil at various moisture contents is called
a) Soil plasticity
b) Soil consistency
c) Soil elasticity
d) Both a & b
b) Soil consistency
Q. 44. Which type of soil is suitable for producing plantation crops-
a) Black soil
b) alluvial soil
c) Desert soil
d) Laterite soil
d) Laterite soil
Q. 45. Which of the following erosion is the removal of soil by running water with the formation of an areas of small branching channels. It can be removed normal tillage operation
a) Sheet erosion
b) Rill erosion
c) Gully erosion
d) Suspension
b) Rill erosion
Q. 46. The movement and filtration of water through soils and permeable rock is termed as
a) Osmosis
b) Percolation
c) Sedimentation
d) Neutralization
b) Percolation
Q. 47. Which is the process of removal of constituents in suspension or solution by the percolating water from the upper to lower layers
a) Humification
b) Illuviation
c) Eluviation
d) Calcification
c) Eluviation
Q. 48. Which of the following SAR range is moderately safe for the crops
a) <1.25
b) <2
c) 15
d) <10
c) 15
Q. 49. What is the pH of calcareous soil
a) <8.5 b) > 8.5 c) <7.5 d) <6.5
a) <8.5
Q. 50. Black soils are best suitable for Dryland agriculture. Canker nodules are mostly found in which soil
a) Alluvial soil b) Black soil c) Red soil d) Laterite soil
