TN 12th Zoology Answer Key 2025 (Available): Exam Analysis, Unofficial Key

Check the TN 12th Zoology Answer Key 2025 available here with the TN 12th Zoology 2025 exam analysis.

Mohith Kumar

Updated on - Mar 11, 2025 | 3:51:00 PM

Check TN 12th Zoology Answer Key 2025 Here (Image Credits: pexels.com).

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
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
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
10. The mode of sexual reproduction in bacteria is by	(a) conjugation
11. The headquarters of the National Biodiversity Authority is situated in	(d) chennai
12. The clusters of gene with related functions are called as	(c) operons
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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