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

Related Mcqs:

1. A country where _____ per cent of the total aea consists of moutains, gullied foot hills, arid waste and deserts, can never achieve the desired progress unless major part of this usable waste is harnessed to the advantage of its people:

   A. 50 to 55
   B. 55 to 60
   C. 65 to 70
   D. None of these

2. 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

3. Besides dung, the weed that can be used in biogas production is:

   A. Eichhornia crassipes
   B. Solanum nigrum
   C. Hydrilla
   D. Parthenium hysterophorus
   E. All of these

4. A disease caused by eating fish contained by industrial waste having mercury compounds is known as:

   A. Minamata disease
   B. Osteosclerosis
   C. Bright’s disease
   D. Hashimoto disease

5. The waste of steel factories is rich in:

   A. Cyanides and phenols
   B. Chlorides and fluorides
   C. Carbonates and sulphides
   D. Bicarbonates and chlorides

6. 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

7. The rate at which light energy is converted into chemical energy of organic molecules is the ecosystem’s:

   A. Net primary productivity
   B. Gross secondary productivity
   C. Net secondary productivity
   D. Gross primary productivity

8. The Organic contents of soil are:

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

9. Important gum producing species are:

   A. Acacia nilotica
   B. Acacia catechu
   C. Acacia senegal
   D. All of the above

10. Thermal insulation, leading to greater deposition of dew. In addition organic mulches also contribute to:

    A. Enhanced humification and microbial activity leading to higher nutrient availability
    B. Improvement of soil structure, by incorporation of plant residues and by encouraging soil fauna.
    C. Mulching is of profound importance in dry regions
    D. Even in more humid climates it may have very beneficial effects with certain species, e.g., the poplar
    E. All of the above