921. In wheat total crop P uptake per ton of gram is about;__________________?
A. 5-20 Kg
B. 2-3Kg
C. 5-7 Kg
D. 20-25 Kg
922. 2,4-d is synthetic herbicide derived from_______________?
A. Amino acid
B. Valine
C. Auxins
D. Cytokmins
923. Penetrometer are used for measuring__________________?
A. Soil tilth depth
B. Soil moisture
C. Soil compaction
D. Soil seepage
924. Excess of nitrogen to plants causes_________________?
A. Delay in ripening
B. Delay in growth
C. Delay in germination
D. All the above
925. Root nodules in plants help in___________________?
A. Photosynthesis
B. aeration
C. Nitrogen fixation
D. Respiration
926. Green revolution came into being due to evolution of_________________?
A. Wheat varieties
B. Sugarcane varieties
C. Cotton varieties
D. All the above
927. The major source of foreign exchange earning is________________?
A. Wheat
B. Sugarcane
C. Cotton
D. Jute
928. The enzyme responsible for biological nitrogen fixation is________________?
A. Lipase
B. Nitrogenase
C. Isomerase
D. Kinease
929. The equipment used for separating, cleaning and grading small seeds from given sample is______________?
A. Seed blower
B. Seed sorter
C. Seed divider
D. a and b
930. Geographical area of Pakistan in million hectare is_______________?
A. 60
B. 80
C. 95
D. none of the above