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11 . Largest reservoir of Nitrogen is exists in :
A. Atmosphere B. Stratosphere. 
C. Hydrosphere D. Lithosphere

12 . 'World Environmental Day' is celebrated every year on:
A. 5th May B. 5th June
C. 5th July D. 18th July

13 . 'Earth's Day' is celebrated every year on:
A. Oct 26th B. April 22nd 
C. June 5th  D. Dec 23rd

14 . Eutrophication means :
A. Water purification
B. Neutralization of waste water
C. Waste water Treatment process 
D. Enrichment of plant nutrients in water bodies

15 . An ecosystem is a region in which
A. Dead organism interact with their environment
B. Living organism interact with their environment
C. Living organism do not interact with their environment
D. All of the above




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