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With an overwhelming sense of genuine pride and obligation, I take the oppourtunity to express my deep sense of gratitude to my guide Dr. Khagendranath Chattopadhyay, Dept. of Institute of Science Education, The University of Burdwan for finalization of this dissertation paper on time. His consistent inspiration and encouragement swayed my mind towards the depth study of the subject of my dissertation topic. Here, I must not leave the oppourtunity to express my gratitude to his sincere guidance and supervision. My sincere thanks to all the staff of the Institution of Science Education, professors, lecturers, and guest lecturers and to other members of the faculty. My special thanks to Dr. T.K.Samanta (Head of the department) Dr. C.Mehra, Dr.N.K.Mondal, Mrs. Rakhi Bhattacharya, Prof. S.K. Chatterjee and to other concern teachers. Lastly , I would like to offer my sincere gratitude to my parents, brothers and other family members , who have been constant source of inspiration and encouragement throughout my life and without their support I couldnt reach at this stage . Many known and unknown persons, who have helped me to a great extent in completing this work.
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