pThe book includes several topics as per Universities curriculum of M.Sc. and M.Phil. course work in Chemistry. This covers different Physiological aspects of Bioinorganic Chemistry in terms of 4 Chapters with in-depth and up-to-date coverage. The book symmetrically presents i Coordination chemistry of chlorophyllsbacteriochlophylls and its functional aspects in photosynthesis, ii Complexes containing nitric oxide Synthesis, reactivity, structure, bonding, and therapeutic aspects of nitric oxide releasing molecules NORMS in human beings and plants, iv Complexes containing carbon monoxide Synthesis, reactivity, structure, bonding, and therapeutic aspects of carbon monoxide releasing molecules CORMS in human beings and plants, and iv Advantageous role of gaseous signaling molecule, H2S Hydrogen sulphide and their respective donors, in ophthalmic diseases and physiological implications in plants. At the end, three relevant topics are included as appendices for updating students and facult