Soil organic matter includes:

Related Mcqs:

1. The major effects of soil organic matter are:

   A. Soil depth
   B. Climatic situation
   C. Both (a) & (b)
   D. None of these

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. The Organic contents of soil are:

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

8. The major soil texture includes:

   A. Course textured soil (more sand particles)
   B. Medium textured soil (qual proportion of very fine sand, silt and clay)
   C. Fine textured soil (silt and clay)
   D. All of the above

9. Degraded zone includes the area with heavy soil erosion:

   A. Acacia modesta
   B. Capparis aphylla
   C. Salvadora oleoides
   D. All of the above

10. 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%