The present book for NEET 2017 based on the Class XI Biology syllabus has been designed to help aspirants prepare for the competitions along with their school studies. The book has been divided into 42 chapters namely Nature & Scope of Biology, The Living World, Biological Classification, Viruses, Monera, Protista, Fungi, Plantae, Classification of Animals, Phylum-Protozoa, Phylum-Porifera, The Radiate Phyla, Phylum-Plantyhelminthes, Phylum-Aschelminthes, Phylum-Annelida, Phylum-Arthopoda, Phylum-Mollusca, Phylum-Echinodermata, Phylum-Chordata I, Phylum-Chordata II, Phylum-Chordata III, Morphology of Flowering Plants, Anatomy of Flowering Plants, Animal Tissues, Structural Organisation in Some Animals, Tools & Techniques, Cell: the Unit of Life, Chromosomes, Cell Cycle & Cell Division, Biomolecules & Enzymes, Transport in Plants, Mineral Nutrition, Photosynthesis in Higher Plants, Respiration in Plants, Plant Growth & Development, Digestion & Absorption, Breathing & Exchange of Gases,