Nitrosomonas  and nitrobacter are together as called_____________?

A. Gully erosion
B. Sheet erosio.
C. Stream bank erosion
D. None of these

A. Micro pores
B. Macro pores
C. Meso pores
D. None of the above

A. Solubor
B. Boric acid
C. Borax
D. All the above

A. Soil crusting
B. Soil consistence
C. Bulk Density
D. Both a & c

A. 1% or less of soil volume
B. 10% or less of soil volume
C. 20% or less of soil volume
D. 30% or less of soil volume

A. Tofography
B. topograpy
C. Topography
D. All of the above