A. Detachement of soil
B. Transportation
C. both A & B
D. None of these
Soil Science
Fe, Zn, Mn, Mo, Co, Ni, Cu, are also called ……….:
A. Micro elements
B. Trace elements
C. Both A & B
D. None of these
Ca, Mg, S are called……….?
A. Primary nutrients
B. Minor nutrients
C. Excellent nutrients
D. None of these
In Balochistan, deserts also exists in ………, which supoorts wind erosion excluding rocky mountains:
A. Desert of Kharan
B. Noshki
C. Both A & B
D. Qilla SaifUllah
Small rivulets or finger like channels formed on the surface of earth by action of water, these channels are of small depth & can be leveled by tillage operations is:
A. Gully erosion
B. Sheet erosio.
C. Stream bank erosion
D. None of these
Following are types if erosion:
A. Rain splash & sheet erosion
B. Rill & Gully erosion
C. Normal (geological) erosion & Accelerated erosion
D. All of these
Principles of soil conservation does not include:
A. Minimize run-off & store surplus water
B. Use non-arable lands effectively
C. Leave barren lands uncultivable to support desrtification degradation
D. Construction of mini dams & ponds to store water for live stock & other porposes
Causes of Soil are:……….?
A. Indiscriminate felling of trees
B. Over grazing
C. Mismanagement of irrigation syste
D. All of these
Which chemical used to prevent evaporation from surface of water in water bodies?
A. Cetyle alcohol
B. Methyle alcohol
C. both A and B
D. None of these
The evolution of new species is known as………….?
A. Specialization
B. Speciation
C. Smog
D. None of these