The major effects of soil organic matter are:

Related Mcqs:

1. Soil organic matter includes:

   A. The partially decayed
   B. Resynthesized plant
   C. Animal residues
   D. All of the above

2. Sources of organic matter are:

   A. Primary
   B. Secondary
   C. Both (a) & (b)
   D. None of these

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

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

4. Which of the following horizons has the maximum amount of organic matter?

   A. Horizons A2 and B
   B. Horizon B only
   C. Horizon A1
   D. Horizons B and C

5. The organic matter, generally 0.5 – 0.8% to about 75 – 100 cm depth, drops to about 0.3% at ______.

   A. Lower depths
   B. Upper depths
   C. Middle depths
   D. None of these

6. When the substratum has ample of organic matter and there are many deterivore participating in the process, the succession is called:

   A. Allogenic
   B. Retrogressive
   C. Heterotrophic
   D. Induced

7. Effects/influences/functions of soil structure are:

   A. Water holding capacity
   B. Aeration
   C. Porosity
   D. Heat transfer
   E. All of the above

8. The Organic contents of soil are:

   A. Humus
   B. Mull
   C. Peat and Much
   D. All of the above

9. The major effects of mulches, irrespective of their composition, are attributed to:

   A. Suppression of weeds, by restricting the amount of light on the ground surface and thus hindering their germination and growth
   B. Conservation of soil, by preventing erosion
   C. Maintenance or improvement of soil structure, by eliminating or mitigating the severity of rain and wind action
   D. All of the above

10. The major types of soil structure are:

    A. Basis: The classification of soil structure is based on size shape and stability of soil aggregates. The soil aggregate may be of following forms
    B. Major shape: Spheroidal, plate like, bloke like, prism like
    C. Both (a) & (b)
    D. None of these