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I am under the onus of obligation of and my sincerest and heart-felt thank due to my supervisor Dr. A.P.Saxena, F.B.S., Head, Department of Botany. Pt. Jawaharlal Nehru P.G.College. Banda for his suggesting me the problem infusing in the zeal and zest to work and for utilizing his indefatigable energy in guiding me and impelling me forward throughout the tenure of this work. I am also grateful to Dr.S.Q.Hasan, Principal, Pt. Jawaharlal Nehru P.G.College, Banda for providing facilities to work in the department. Science is a collaborative enterprise and therefore I received sagacious advice, valuable suggestions, literature on loan from a number of persons. In this sequence I am indebted to. Prof. K.M.Vyas, Head, department of Botany, Sir H.S.Gaur University, Sagar; Sri R.D.Dixit, Addl. Director, B.S.I., Allahabad; Sri P.Pushpangadan, Director, N.B.R.I., Lucknow; Dr. Karuna Verma. Professor & Dean, Biological Science, Rani Durgavati University, Jabalpur, Late Sri R.P.Shivhare, Dr.S.P. Srivastava and Dr. Rajesh Srivastava, Department of Botany, Attara P.G.Colege, Attarra (Banda), Dr. A.K.Awasthi and Dr.P.K.Singh, Department of Botany, Pt. J.N.P.G.Colelge, Banda (U.P.). I am grateful to the authorities of B.S.I., Allahabad, N.B.R.I., Lucknow and Sir H.S.Gaur University, Sagar for providing me library facilities. Sri Dr. A.C.Nigam and Dr. D.C.Gupta, Department of Chemistry; Sri M.P.Singh, Department of Zoology, Atarra P.G.College, Atarra (Banda), Dr. K.V.Singh, Smt. Anuradha Ranjan, Dept. of Zoology and Sri P.M.Sairaha, Dept. of English, Pt.J.N.P.G.College, Banda; Sri Dinesh Khare, Sri V.K.Verma, J.N.Srivastava, Mohd. Habeeb Khan, Dr. Suresh Khare and Sri Ashok Verma has been kind enough for going through the manuscript and suggesting improvements, to them I, owe my heart felt thanks.

[ I would not let the opportunity slip away without thankfully acknowledging the benefit of valuable assistance from my friendly helpers and colleagues Sri Praveen Nigam, Sri Santosh Tiwari, Sri Brijesh Khare, Sri Rajesh Khare, Sri Daya Nidhan, Sri Amit Awasthi, Sri K.P.Khare. Sri Gauresh Kumar, Sri A.K.Tripathi, Km.Prachi Sinha and Smt. Kavita Chaudhary. I express my regards to my father Sri Ramesh Chandra Khare and my mother Smt. Urmila Khare for encouragement during the work, Thanks are also due to other members of my family Sri Naveen Khare, Smt. Shalinee Khare, Sri R.P.Khare, Smt. Archana Khare for providing time to time moral support during the course of investigation. Last but not the least I acknowledge my gratification to Mr. H.S.Srivastava, Steno, Pt.J.N.P.G.College, Banda for his painstaking and neat computer typing of the thesis. Department of Botany Pt.Jawaharlal Nehru P.G. College, Banda (U.P.) khax. 30.10.2002 Praveen Kumar Khare