Which of the following nutrient elements are regarded as energy exchangers:
A. Hydrogen
B. Oxygen
C. Both A & B
D. None of these
Soil Science
A mineral horizon that is either too thin, too light in colour, too low in organic matter:
A mineral horizon that is either too thin, too light in colour, too low in organic matter:
A. Umbric epipedon
B. Melanic epipedon
C. Mollic epipedon
D. Ochric epipedon
Soil Organic Matter (SOM) which consists of about _______ % organic carbon plays a vital role by providing macro & micro nutrients:
Soil Organic Matter (SOM) which consists of about _______ % organic carbon plays a vital role by providing macro & micro nutrients:
A. 72 %
B. 58%
C. 62 %
D. Al of the above
Each layer of phyllosilicates is composed of two types of sheets:
Each layer of phyllosilicates is composed of two types of sheets:
A. Tetrahedral sheet
B. Triple octahedral sheet
C. Octahedral sheet
D. Both A & C
The internal & external surfaces of soil colloids are positively and or negatively charged. Mostly ____________ is dominant:
The internal & external surfaces of soil colloids are positively and or negatively charged. Mostly ____________ is dominant:
A. Positive
B. Negative
C. Zero
D. All of the above
Which of the following is not the soil order prevail in Pakistan?
Which of the following is not the soil order prevail in Pakistan?
A. Aridisols
B. Alfisols
C. Mollisols
D. None of the above
The availability of essential nutrients from soil to the plants is controlled by the ________ properties of soil:
The availability of essential nutrients from soil to the plants is controlled by the ________ properties of soil:
A. Physical
B. chemical
C. Biological
D. both A & B
Conservation agriculture improves the water use efficiency of dryland systems. It has components:
Conservation agriculture improves the water use efficiency of dryland systems. It has components:
A. Reduced soil disturbance through no-till or minimum till
B. Residue return to keep at least 30% of soil covered
C. Crop rotations for better utilization of available water & nutrients
D. all of the above
The planned development, distribution and use water resources:
The planned development, distribution and use water resources:
A. Water distribution
B. Water management
C. both A & B
D. None of the above
Water is the major constituent of all living creatures. Biomass of plants is composed of ________% water:
Water is the major constituent of all living creatures. Biomass of plants is composed of ________% water:
A. 65 – 75%
B. 72 – 62%
C. 85 – 95%
D. 75% – 80%