This textbook has been designed to meet the needs of B.Sc. Third Semester students of Botany as per the UGC Choice Based Credit System (CBCS). It acquaints students with the tissue system, anatomy of stems, roots & leaves and secondary growth. It explains adaptive & protective systems and structural organization of a flower. Besides, the book also covers pollination, fertilization, development of endosperm and embryo, apomixis and polyembryony. While it provides strong conceptual understanding of the subject, it also helps in developing scientific outlook of the student.