Ecosystem receives nitrogen from outside through:

Related Mcqs:

1. Whole of the country, outside the main Himalayan Range, receives a low variable rainfall from 50 mm in western parts of Boluchistan highlands to about 1500 mm in the _____

   A. Himalayan region
   B. Hindu Kush region
   C. Karakoram region
   D. None of these

2. In a comparative study of grassland ecosystem and pond ecosystem it may be observed that:

   A. Primary and secondary consumers are similar
   B. Both biotic and abiotic components are different
   C. The biotic components are almost similar
   D. The abiotic components are almost similar

3. Exotic species, which brought for plantation from some other country to our country or even from one ecosystem to other ecosystem are called, as exotic species like:

   A. Pinus nigra – Japan
   B. Euralyptus – Australia
   C. Polunia – China
   D. All of the above

4. The river sone receives wastes from:

   A. Refinery
   B. Distillary
   C. Textile mill
   D. Paper mill

5. Relationship between nitrogen fixing bacteria and a legume plant is described as:

   A. Mutualistic
   B. Parasitic
   C. Saprophytic
   D. Commensal

6. The natural nitrogen cycle is greatly affected by the excessive use of:

   A. Sulphate fertilizers
   B. Insecticides
   C. Phosphate fertilizers
   D. Nitrate fertilizers

7. The earth’s atmosphere contains over _____ % by volume of nitrogen gas:

   A. 58
   B. 68
   C. 78
   D. None of these

8. The bacteria, which reduce nitrates in the soil to gaseous nitrogen, are known as denitrifying bacteria such as:

   A. Nitromonas
   B. Pseudomonas
   C. Nostoc
   D. Rhizobium

9. Nitrogen oxides produced from the emission of automobiles and power plants, are the source of fine air borne particles which lead to:

   A. Photochemical smog
   B. Dry acid deposition
   C. Industrial smog
   D. Wet acid deposition

10. The driving force of the ecosystem is:

    A. Carbohydrates in plants
    B. Biomass
    C. Solar energy
    D. Producers