Which one of the following insecticides is the most persistent in soil?

Related Mcqs:

1. Removal of top soil by soil erosion result in the loss of soil:

   A. Nitrites
   B. Nitrates
   C. Nitrogen
   D. Nitric and nitrous acids

2. In water logged soil plants cannot grow properly because the soil is:

   A. Physiologically wet
   B. Physiologically dry
   C. Physically dry
   D. None of the above

3. When a plant first begins to wilts permanently in a pot, its 54.5 gms of soil has 4.5 gms of water. The PWP of this soil is:

   A. 4.50%
   B. 9%
   C. 8.25%
   D. 16.50%

4. The ration of volume of pores in the soil to the total soil volume is referred to as:

   A. Pore frequency ratio
   B. Pore density ration
   C. Pore abundance ratio
   D. Pore space ratio

5. When a soil has been thoroughly wetted and then allowed to drain until capillary movement of the water has stopped, the water content of the soil will give an estimate of it’s:

   A. Gravitational water
   B. Capillary water
   C. Field capacity
   D. Storage capacity

6. In which one of the following pairs is the specific characteristic of a soil not correctly matched?

   A. Terra rossa – Most suitable for roses
   B. Chernozems – Richest soil in the world
   C. Black soil – Rich in calcium carbonate
   D. Laterite – Contains aluminium compound

7. In which one of the following habitats does the diurnal temperature of soil surface vary most:

   A. Forest
   B. Desert
   C. Grassland
   D. Shrub land

8. As a result of fire, there is destruction of the following components of soil:

   A. Litter
   B. Organisms
   C. Inorganic matter
   D. All of these

9. The soil formation occurs in the following consecutive stages:

   A. Weathering : sedimentation
   B. Weathering : pedogenesis
   C. Pedogenesis : weathering
   D. Sedimentation : pedogenesis

10. One of the following crops is the most effective in controlling soil erosion:

    A. Cotton
    B. Pigeon pea
    C. Green gram
    D. Maize