A research approach on biodiversity has been undertaken in this book. The biodiversity of plants, animals, fungi and microbes has been discussed in detail, along with biodiversity and its impact on mental health. The complexity of the association has been approached from various angles, taking into account the interventions at various stages. A scientific approach has been adopted in this book which exhibits the inter-connectivity of all the three levels, emphasizing the need for conservation and protection of the systems if human existence is to continually benefit from it. This book is a valuable reference for researchers and students interested in biodiversity.