An American plant which had become a troublesome weed in India is

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12. Carbon cycle includes
13. The source of energy in the ecosystem is:
14. What is the major constituent of biomass of an organism
15. Smog is a common pollutant in places having
16. Correct definition of ecosystem is :
17. Biologists celebrate 5th June as
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19. Hydrilla is a
20. What will happen if our water resources are continued to be polluted by industrial wastes
21. The ultimate source of energy for fish is
22. One of these is a renewable source of energy:
23.   Which of the following is normally not at atmospheric pollutant
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