TN 12th Zoology Answer Key 2025: The Tamil Nadu Board of Secondary Education, Chennai, held the TN Class 12 Zoology 2025 examination today, March 11, 2025. The exam was held from 10 AM to 1:15 PM. The Tamil Nadu Class 12 Zoology 2025 question paper had a weightage of 70 marks. Students who appeared for the examination and are eager to analyse their performance can check the TN 12th Zoology Answer Key 2025 available here with the TN 12th Zoology 2025 exam analysis.
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TN 12th Zoology Answer Key 2025
The Tamil Nadu Zoology 2025 unofficial answer key is given in the table below.
Part - I
| Questions | Answers |
| 1. A person is injured and got swelling. The swelling, due to the infection of tissue is an example of : | (c) Inflammation |
| 2. The first codon to be deciphered was----which codes for--- | (a) UUU, Phenylalanine |
| 3. Find out the wrongly matched pair. | (d) Patau's Syndrome - Trisomy 13 |
| 4. The Neanderthal man had the brain capacity of : | (c) 1400 CC |
| 5. Which one of the following groups includes sexually transmitted diseases caused by bacteria only? | (d) Syphilis, chlamydiasis and gonorrhoea |
| 6. ELISA is mainly used for | (d) Detection of pathogens |
| 7. The most important hormone in initiating and maintaining lactation after birth is: | (a) Prolactin |
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8. Assertion: The envirometal conditions of the tropics are favourable for speciation and diversity of organisms Reasons: The climate, season, temperature, humidity, and photo period are more or less stable and congenial |
(b) Reason correctly explains the assertion |
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9. The figure given below is a diagrammatic representation of response of organisms to abiotic factors. What do A, B and C represent respectively |
(c) conformer, regulator, and partial regulator |
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10. The mode of sexual reproduction in bacteria is by |
(a) conjugation |
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11. The headquarters of the National Biodiversity Authority is situated in |
(d) chennai |
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12. The clusters of gene with related functions are called as |
(c) operons |
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13. Which of the following microorganism is used for production of citric acid in inductries? |
(a) Aspergillus Niger |
|
14. The 'thickness' of Stratospheric Ozone layer is measured in |
(d) Dobson units |
|
15. Haemozoin is |
(b) a precursor of haemoglobin |
TN 12th Zoology Exam Analysis 2025
The TN 12th Zoology Question Paper Analysis 2025 is given in the table below.
| Particulars | TN 12th Zoology Exam Analysis 2025 |
| Overall Exam Difficulty | Moderate |
| Part I Difficulty Level | Easy |
| Part II Difficulty Level | Easy |
| Part III Difficulty Level | Easy to Moderate |
| Part IV Difficulty Level | Easy to Moderate |
| Number of Good Attempts | to be added |
| Was the Paper Lengthy and Time Consuming? | Mixed reactions |
The TN 12th Zoology Exam Analysis 2025 and the TN 12th Zoology Answer Key 2025 available here are unofficial and are only for students' reference. Visit the official website of the Tamil Nadu Board of Secondary Education for more information.
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