21. What is troposphere?
22. When human body is infected by infection __________ type of cells are activated to defend the body.
23. Who among the following is commonly called "Bird Man of India"?
24. The movement "Pani Panjayath" was initiated to conserve waters in the drought prone areas of _______state.
25. Carbon monoxide is a pollutant because
26. MAB program stands for
27. MAB stands for
28. Vermi-composting is a natural method of
29. Plants that grow in saline water-logged habitat are called
30. National Maritime Day of India is celebrated on ______________
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