CONTENTS:- Introduction; Agricultural Revolutions in 21st century Though Biotechnology and Cloning; Nanotechnology; Plant Biotechnology in Modern Time Biotechnology and Genetic Resource Policies; Biotechnology; Tolls and Techniques; and Environmentally Sound Management of Biotechnology. The present publication 'Biotechnology in 21st Century' focuses on specific use Biological Technology in agriculture, Food Science and Medicine. Biotechnology combines disciplines like genetics, molecular biology, biochemistry, embryology and cell biology.