Humus generally refers to the decomposed organic residues which have undergone a series of degradation and synthesis cycles. The humic substances consist of a series of highly acidic, yellow to black coloured, high molecular weight compounds __________________, which can be separated using different extraction procedures:

Related Mcqs:

1. Extraction of humic substance can be done by______________________?

   A. NaOH
   B. NH4Cl
   C. NH4OH
   D. None of the above

2. 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

   Submitted by: Shafiq Rehman

3. Who gave the defination of humic acid ?

   A. Gapon
   B. Felbeek
   C. Neir
   D. Liekig

4. Humic acid is soluble in______________________?

   A. Acid
   B. Alkali
   C. Both a & b
   D. Distilled water

5. Humic acid is soluble in____________________?

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

6. Solution containing molecular weight of a substance in gram per liter of a solution is known as______________________?

   A. Normal
   B. Molal
   C. Molar
   D. None of the above

7. The process of transformation of raw organic matter into humus:

   A. Calcification
   B. Horizonation
   C. Illuviation
   D. Humification

   Submitted by: Shafiq Rehman

8. Clay and humus particles are referred to as colloids and are less than 0.002mm. Due to their small size, colloids have ________________ surface area which provides surface for adsorption, catalysis, precipitation and microbial colonization:

   A. Extremely low
   B. Extremely high
   C. Very little
   D. None of these

   Submitted by: Shafiq Rehman

9. 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

10. An expression of the intensity of the basic or a acidic condition of a liquid or of soil is called_____________________?

    A. ESR
    B. SAR
    C. EC
    D. pH