The Botanical Survey of India (BSI), established in 1890, is the national centre for biodiversity conservation under the Ministry of Environment, Forest and Climate Change. BSI Scientific Officers survey, document, and conserve India's rich plant diversity—estimated at 47,000+ species including approximately 17,000 flowering plants. They conduct floristic surveys, manage plant germplasm repositories, publish Flora of India accounts, maintain herbaria (Kolkata herbarium is one of Asia's largest), and advise on biodiversity conservation policy and environmental impact assessments.

BSI Scientific Officer recruitment is conducted through direct selection by BSI/MoEFCC or via UPSC for senior scientist posts. The objective exam has 100 MCQs in 120 minutes with -0.33 negative marking. Topics include Plant Anatomy and Morphology, Taxonomy and Systematics (including phylogenetics and nomenclature), Plant Physiology and Biochemistry, Ecology and Conservation Biology, Ethnobotany, and Environmental Laws. The descriptive stage (for UPSC pathway) requires in-depth botanical knowledge and scientific writing skills.

Candidates must hold a M.Sc. degree in Botany, Plant Biology, Plant Biotechnology, or a related life science discipline. A PhD in Botany or Taxonomy is often required for Scientist Grade C and above. Practical experience in field surveys, herbarium specimen preparation, or plant identification using taxonomic keys is highly valued. BSI regularly hires candidates who have worked on state or district-level floristic surveys, wildlife institute projects, or university biodiversity documentation projects.

BSI officers start as Junior Scientific Officer or Scientist B and progress through Scientist C, D, E, and F grades based on research output and promotions. Pay scales follow the Scientific and Technical Staff pay structure (approximately Rs. 56,100 at entry level). Officers may specialise in Taxonomy, Ethnobotany, Conservation Genetics, or Phytochemistry. BSI has regional centres in Pune, Coimbatore, Shillong, Dehradun, Jodhpur, Allahabad, Andaman, and Gangtok, offering diverse postings. International collaborations with Kew Gardens (UK) and other herbaria are also part of the BSI's activities.

Master plant taxonomy from standard references: Singh et al. for taxonomy, Cutter for plant anatomy, Taiz and Zeiger for plant physiology, and Krebs for ecology. Study the International Code of Nomenclature (ICN) and principles of cladistics and molecular systematics for modern taxonomy questions. Cover the Wildlife Protection Act 1972, Biological Diversity Act 2002, and CITES for the environmental law section. Practise identification-based questions using herbarium sheets and taxonomic keys. CSIR-NET Life Sciences papers are an excellent proxy for the expected depth.