11. Nitrogen fixing blue green alga
12. Which one is natures cleaner?
13. Autotrophs are ............................
14. What is desertification?
15. Ramsar Convention refers to the conservation of ............................
16. Rain during November is more acidic than monsoon rain due to
17. The word Biophilia was coined by
18. An ecosystem gradually merges with an adjoining one through a transitional zone is called the ............................
19. Study of inter-relationship between organisms and their environment is
20. The phenomenon of occurrence of additional species found in the ecotone or transitional zone between adjoining ecosystems is known as ............................
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