Disclaimer: Education guidance for students and parents choosing Tamil Nadu Higher Secondary groups. This is civic journalism, not a Directorate of Government Examinations circular or a school prospectus. Group codes, subject combinations, and undergraduate eligibility change — confirm the current offer with the admitting school and official admission notifications before you decide.
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Biology covers botany and zoology themes the SCERT syllabus sets for Classes XI and XII — cell biology, plant and animal physiology, genetics, ecology and human health chapters among them. Volumes are typically paired per class. Diagrams and practical records matter as much as the PDF. The book is a Part III core only for students whose group includes Biology. On this desk that is 2503, not 2502.
Families aiming at MBBS, BDS, veterinary, agriculture, pharmacy or allied health usually need Biology in Higher Secondary plus the current NEET or university rule. We do not publish a cut-off. We do say: do not pick 2502 and assume a later crash course replaces two years of Biology. Conversely, 2503 is a heavy load because Mathematics stays in the four cores.
Commerce and humanities students do not download this Biology set for their group. If a school offers a different science code with Zoology/Botany split titles, ask the office for the exact book names — this finder lists the combined Biology volumes used with 2503.
Official files: verify on the Textbook Corporation portal (last checked 12 September 2026). This site never stores the PDF. If someone forwards a Telegram file, treat it as unofficial until you match the cover and year on the government catalogue.
Continue to the 2502 versus 2503 page, the medicine pathway, and the Class 11 / Class 12 catalogues. Keep practical record books at school; this finder is only for the theory volumes SCERT lists on the official catalogue.
The six-paper structure does not change because you opened a PDF. Language and English remain on the timetable. Use the matching group page to see who should sit this subject, and the after-12th pathway pages to see which official portal (TNEA, NTA, ICAI) publishes eligibility for the year you apply. This finder will never invent a cut-off, never host the book, and never replace the school’s printed volume when the cover year differs. Ask the class teacher if a volume is not listed for your medium. Parents should also confirm whether the school uses English-medium or Tamil-medium books before saving a file, because the two editions are not interchangeable for classroom homework. If the Corporation site is down, wait and retry the official host rather than accepting a forwarded Drive archive. Keep lastChecked in view so you know when we last tried the government link.
Every general academic student still writes Part I language and Part II English. The volumes on this finder are only the Part III cores. Confirm the medium (English or Tamil) with the school, ignore third-party “Samacheer” hosts, and treat lastChecked as a freshness stamp — not a promise that a government URL will stay online forever. If a button 404s next week, keep this page and open the Textbook Corporation home page again.
Official source. Official portal last checked 2026-09-12. Primary index: https://www.textbookcorp.in/. Alternate host to try: https://textbookcorp.tn.gov.in/.
Volumes
Biology — Class XI Volume I
Class 11 · Volume I · last checked 2026-09-12
Groups that need this book: 2503
Biology — Class XI Volume II
Class 11 · Volume II · last checked 2026-09-12
Groups that need this book: 2503
Biology — Class XII Volume I
Class 12 · Volume I · last checked 2026-09-12
Groups that need this book: 2503
Biology — Class XII Volume II
Class 12 · Volume II · last checked 2026-09-12
Groups that need this book: 2503
Related groups
Download how-to: Plus Two textbooks PDF.
Fine print
This page was drafted with AI-assisted tools and human editorial review for mychennaicity.in. AI can miss updates or local nuance — cross-check primary sources and your own documents before decisions. Cross-check group codes with the Tamil Nadu Directorate of Government Examinations and the admitting school. For engineering, medicine and professional courses, use the current TNEA, NTA and institute notifications — not this page alone.