The lower leaves turn yellow and in some crops they quickly start drying up as if suffering from shortage of water, stunted growth, leaves & fruits shedding & whole plant becomes yellow, are deficiency symptoms of:_________?

A. Potash
B. Nitrogen
C. Calcium
D. Both a & c

Items needed for synthesis of plant food in green leaves are _________ & the process through which it takes place is called photosynthesis:

A. Sunlight
B. Chlorophyll
C. Water & plant nutrients
D. All of the above

Who is known as “the father of Hybrid Rice”?

A. Yaun longping
B. Yaun pingpong
C. Zuhee yaun
D. None of these

Nitrogen & sulphur dioxide liberate from motor vehicles & industries. Nitrogen & Sulphur gases dissolve in the water vapour of atmosphere & form nitric & sulphuric acid. This rain water falls on soil as__________ & contaminates soil also:

A. Acid rain
B. Neutral rain
C. Both a & b
D. None of the above

Moderately toxic compound:_________?

A. Lead
B. Fluorine
C. Nickle
D. All of the above

Soils are also contaminated by a number of inorganic compounds which are also high toxic to human & other animals & are extremely poisonous may include:

A. Arsenic & cadmium
B. Mercury & chromium
C. Calcium & magnesium
D. Both a & b

Chemicals, used for controlling the disease of crops, fruits & vegetables is___________ & chemical prepared for controlling insect-pests ——————-:

A. Insecticides—herbicides
B. Fungicides—insecticides
C. Weedicides—insecticides
D. None of the above

Effects of soil pollution may also include:___________?

A. Pollution runs-off into rivers & kills the fish, plant & other aquatic life
B. Crops & fodder grown on polluted soil may pass the pollutants on to the consumers
C. Soil structure is damaged or polluted soil may no longer grow crops & fodder
D. All of the above

The capacity of a soil to function on sustained basis promoting plant and animal health:

A. Soil quality
B. Soil pollution
C. Soil salinity
D. None of these

The soil texture refers to the relative proportion of sand,__________ and clay:

A. Stone
B. Soil
C. Rock
D. Silt