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

Related Mcqs:

1. Which of the following horizons is generally referred to as the illuvial zone?

   A. Horizon-B
   B. Horizon-A
   C. Horizon-O
   D. Horizon-C

2. 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

3. 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

4. Sources of organic matter are:

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

5. The major effects of soil organic matter are:

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

6. Soil organic matter includes:

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

7. The amount of living matter present in a component population of a particular trophic level is called:

   A. Standing crop
   B. Standing quality
   C. Both (a) & (b)
   D. Standing state

8. The maximum amount of CO2 fixed by green plants by way of photosynthesis in a year is:

   A. 9 x 1013 kg
   B. 8 x 1012 kg
   C. 9 x 1011 kg
   D. 8 x 1010 kg

9. During anaerobic digestion of organic waste, such as in producing biogas, which of the following is left undegraded?

   A. Lignin
   B. Lipids
   C. Cellulose
   D. Hemi-cellulose

10. A lake with an inflow of domestic sewage rich in organic waste may result in:

    A. Drying of the lake very soon due to algal bloom
    B. An increased production of fish due to lot of nutrients
    C. Increased population of aquatic food web organisms
    D. Death of fish due to lack of oxygen