A compound toxic to crop formed by the thermal decomposition of urea is_________________?

Related Mcqs:

1. During decomposition of organic matter, inititial decomposition is dominated by:__________?

   A. Actinomycetes
   B. Bacteria
   C. Fungi
   D. Both B & C

   Submitted by: Shafiq Rehman

2. Moderately toxic compound:_________?

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

   Submitted by: Shafiq Rehman

3. What is the effect of application of P2O5 fertilizer to a green manure leguminous crop in the availability of phosphorus to the succeeding crop?

   A. Green manure increases the availability in organic from to the next crop
   B. It does not affect the availability of phosphorous to succeeding crop 
   C. Greater amount of phosphorus is taken up and converted into organic form, which is released on decomposition of green matter
   D. It fixes the P2O5 through humus and reduces the availability..

   Submitted by: Shafiq Rehman

4. The chemical formula of urea fertilizer is_______________________?

   A. NH₂CONH₂
   B. [CO(NH₂)]
   C. Both a & b
   D. None of the above

5. Urea in manufactured form gases________________________?

   A. NH3
   B. NH48CO2
   C. NH3 & CH4
   D. All the above

6. According to FCO, the maximum permissible total N content in the form of urea in DAP should be:_________?

   A. 2.50 %
   B. 3.50 %
   C. 4,50 %
   D. 5.5 %

   Submitted by: Shafiq Rehman

7. What is the formula of urea?

   A. CO (NH₂)₂
   B. NH₂-CO-NH-CO-NH₂
   C. (NH₄)₂CO₃
   D. None of these

   Submitted by: Shafiq Rehman

8. Decomposition of the organic matter in submerged soil is carried out by?

   A. Actinomycetes
   B. Fungi
   C. Algae
   D. None of the above

   Submitted by: Shafiq Rehman

9. The most abundant metal in the earth’s crust and toxic to plants in low concentration is____________________?

   A. Mo
   B. Al
   C. Fe
   D. All the above

10. 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

    Submitted by: Shafiq Rehman