This chapter provides an overview of the history of pollination biology, it begins by discussing the basics of pollination and goes on to discuss pollinators and their diversity. Sections also cover the ecology and evolution of floral traits, domestication and its impact on plant-pollinator relationships and how pollinators can impact agriculture. A section on modern agriculture and pollinators…
Biological nitrogen fixation has essential role in N cycle in global ecosystem. Several types of nitrogen fixing bacteria are recognized: the free-living bacteria in soil or water; symbiotic bacteria making root nodules in legumes or non-legumes; associative nitrogen fixing bacteria that resides outside the plant roots and provides fixed nitrogen to the plants; endophytic nitrogen fixing bacter…