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

Related Mcqs:

1. Norman Borlaug, the American agricultural scientist and plant pathologist developed the high yield strains that greatly increased crop yields. He laid the groundwork for the green revolution and was awarded the Nobel Prize for Peace in ________

   A. 1970
   B. 1972
   C. 1974
   D. 1976

2. Excessive aerenchyma is characteristic of:

   A. Hydrophytes
   B. Xerophytes
   C. Mesophytes
   D. Heliophytes

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

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

4. 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

5. Ecosystem receives nitrogen from outside through:

   A. Biological nitrogen fixation
   B. Electrification of nitrogen
   C. Industries
   D. All the above

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

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

7. 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

8. If we completely remove the decomposers from an ecosystem, its functioning will be adversely affected because:

   A. Herbivores will not receive solar energy
   B. Rate of decomposition of other component will be very high
   C. Mineral movement will be blocked
   D. Energy flow will be blocked

9. The component of a living cell affected by the pollutant SO2 is:

   A. Nucleus
   B. All cell membrane system
   C. Cell wall
   D. Plasmodesmata

10. Diseased trees (k) including those which are infected with parasites to such an extent that their growth is seriously affected or that they are a danger to their neighbours:

    A. Dominant
    B. Dominated and suppressed
    C. Both (a) & (b)
    D. None of these