TN 12th Biology Answer Key 2025: As per the official timetable, the Tamil Nadu Board of Secondary Education, Chennai, held the TN Class 12 Biology 2025 examination today, March 18, 2025. The exam was held from 10 AM to 1:15 PM. The Tamil Nadu Class 12 Biology 2025 question paper had a weightage of 70 marks. Students must score a minimum of 15 marks out of 70 marks. Overall, a student must score 35 marks out of 100 to pass the examination. Students can check the TN 12th Biology Answer Key 2025 available here with the TN 12th Biology exam analysis 2025.
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TN 12th Biology Answer Key 2025
The Tamil Nadu Biology 2025 unofficial answer key is given in the table below.
| Questions | TN 12th Biology Answer Key 2025 |
| 1. Linkage group.... | c) 10 |
| 2. Solar energy used by green plants... | d) 2-10% |
| 3. Parthenocarpic fruits lack.... | c) seed |
| 4. Southern blotting.... | d) DNA |
| 5. virus free plants are... | d) meristem culture |
| 6. people's movement... | a) appiko movement |
| 7. pedogenesis refers to... | c) soil |
| 8. example for polygenic inheritance... | c) skin colour in humans |
| 9. what is militophily | Mellitophily refers to pollination by bees, a crucial process for plant reproduction where bees, attracted by flowers with specific features, transfer pollen from one flower to another. |
| 10. short note on pollenkitt | Pollenkitt is a sticky, lipid-rich substance covering pollen grains, particularly in plants pollinated by animals, aiding in pollen adhesion and capture by pollinators. |
| 11. two significances of ploidy | Ploidy, the number of chromosome sets in a cell, significantly impacts an organism's evolutionary potential and adaptation to various environments. |
| 12. Give the examples for micropropagation performed in plants | examples include ornamental plants like lilies and orchids, as well as crops like sugarcane, cassava, and potatoes. |
| 13. two objectives of plant breeding | Two primary objectives of plant breeding are to increase crop yield and improve the quality of the produce. |
| 14. differentiate biomedicines and botanical medicine | Biomedicine uses scientific principles, especially biology and biochemistry, to diagnose and treat diseases, often employing drugs, surgery, and radiation, while botanical medicine focuses on using plants and their extracts for medicinal purposes, drawing from traditional knowledge and often used in conjunction with other therapies. |
TN 12th Biology Exam Analysis 2025
The TN 12th Biology Question Paper Analysis 2025 is given in the table below.
| Particulars | TN 12th Biology Exam Analysis 2025 |
| Overall Exam Difficulty Level | Moderate to Difficult |
| Section I Difficulty Level | Easy to Moderate |
| Section II Difficulty Level | Moderate to Difficult |
| Section III Difficulty Level | Moderate |
| Section IV Difficulty Level | Moderate to Difficult |
| Number of Good Attempts | 50+ |
| Was the Paper Lengthy and Time Consuming? | Section III and IV were lengthy and time consuming. |
Students are advised to refer to the TN 12th Biology Answer Key 2025 and the TN 12th Biology Exam Analysis 2025 only for their reference. Visit the official websites of the Tamil Nadu Board of Secondary Education for more information.