Zoology · Class 12 Science

Puducherry Tnboard Class 12 Zoology — Real Previous-Year Papers

with complete answers

Real previous-year board papers, year by year — the official exam pattern, the full question paper, and every question solved the concept-first way. Distinct from the chapter-wise textbook bank.

2016–2026
Years of papers: 10
Total Papers: 10
Real Board Papers: 0
Sample papers: 392
Real-paper Q & A: 0
Sample-paper Q & A

Real board-paper questions available, by year

38 Q2026complete

38 Q2025complete

38 Q2024complete

38 Q2023complete

38 Q2022complete

—2021Not available

38 Q2020complete

23 Q2019complete

70 Q2018complete

39 Q2017complete

32 Q2016complete

Tamil Nadu HSC (DGE) Board 2026 · Set ANNUAL

Real board examination

About this paper

The real Class-12 board examination held in 2026. Every question below is solved the concept-first way. Sample papers are labelled honestly — never shown as a past exam.

Total marks: 70
Questions: 38
Duration: 180 min
Sections: 6

The marks / questions / duration above are the official exam pattern. We currently have 38 of this paper’s questions (100% of the full paper), with 38 fully solved. Questions we couldn’t yet extract or verify are held — never shown as complete.

Sections & marks

Section	Type	Questions	Marks each	Total
ASection A	compulsory	15	1	15
BSection B	compulsory	1	2	2
BSection B	choice	8	2	16
CSection C	compulsory	1	3	3
CSection C	choice	8	3	24
DSection D	compulsory	5	5	25
Total		38		70

The question paper

The questions we hold for this paper, laid out by section. Solutions are on the Answers tab.

Board Examination

Zoology

Tamil Nadu HSC (DGE) Board 2026 · Set ANNUAL

Series/Set: ANNUALRoll No. ________

Time Allowed: 3 hoursMaximum Marks: 70

General Instructions

This question paper contains 38 questions divided into 6 sections — A, B, B, C, C, D.
Section A comprises 15 questions of 1 mark each (compulsory).
Section B comprises 1 question of 2 marks each (compulsory).
Section B comprises 8 questions of 2 marks each (choice).
Section C comprises 1 question of 3 marks each (compulsory).
Section C comprises 8 questions of 3 marks each (choice).
Section D comprises 5 questions of 5 marks each (compulsory).

Above is the official exam pattern. The questions printed below are those we currently hold for this paper.

Section A

compulsory · 1 mark each · 15 of 15 shown

Q1.

In which type of Parthenogenesis are only males produced ?

(a) Arrhenotoky
(b) Thelytoky
(c) Amphitoky
(d) Both
(a) and (c)

[1]

Q2.

Statement I : Castration (or) surgical removal of testis is known as Orchidectomy. Statement II : It leads to difficulty in urination.

(a) Statement I and Statement II are not correct.
(b) Statement I and II are correct.
(c) Statement I is not correct and Statement II is correct.
(d) Statement I is correct and Statement II is not correct.

[1]

Q3.

Select the incorrect action of hormonal contraceptive pills from the following.

(a) Changes in cervical mucus impairing its ability to allow passage and transport of sperms
(b) Inhibition of spermatogenesis
(c) Alteration in uterine endometrium to make it unsuitable for implantation
(d) Inhibition of ovulation

[1]

Q4.

This pedigree symbol represents : [figure: a small printed pedigree-chart symbol — two squares (offspring symbols) placed side by side and joined by a short horizontal line, with a single line rising from the midpoint of that horizontal line up to a peak/apex above, giving the whole mark a triangular silhouette (a single point of origin branching down to the two squares).]

(a) Male
(b) Monozygotic twins
(c) Mating
(d) Dizygotic twins

[1]

Q5.

Hershey and Chase's experiment with bacteriophage showed that :

(a) DNA contains radioactive sulphur.
(b) Protein gets into the bacterial cells.
(c) Viruses undergo transformation.
(d) DNA is the genetic material.

[1]

Q6.

Find out the wrongly matched pair.

(a) Y-chromosome - 231 genes
(b) Chromosome-1 - 2968 genes
(c) Dystrophin - 2.4 million bases
(d) Human genome - 300 bases

[1]

Page 1 of 8

Q7.

The wings of birds and butterflies is an example of : (a) Divergent evolution (b) Adaptive radiation (c) Variation (d) Convergent evolution

[1]

Q8.

Which of the following groups of diseases have been controlled by the use of vaccines and by creating awareness among the people ? (a) Small pox, amoebiasis, diphtheria, tetanus. (b) Small pox, polio, diphtheria, tetanus. (c) Small pox, AIDS, diphtheria, tetanus. (d) Small pox, common cold, diphtheria, tetanus.

[1]

Q9.

Allergy involves : (a) IgA (b) IgE (c) IgM (d) IgG

[1]

Q10.

The most common substrate used in distilleries for the production of ethanol is _____. (a) Molasses (b) Soya meal (c) Corn meal (d) Groundgram

[1]

Q11.

Assertion (A) : In nature many organisms produce clones through asexual reproduction. Reason (R) : By this process, genetically identical individuals are produced. (a) Both Assertion and Reason are false. (b) Assertion is true, but Reason is false. (c) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion. (d) Both Assertion and Reason are true and Reason explains Assertion correctly.

[1]

Q12.

The relationship between sucker fish and shark is _____. (a) Predation (b) Competition (c) Parasitism (d) Commensalism

[1]

Q13.

The term "Niche" was first used by _____. (a) John Ray (b) Charles Darwin (c) Jordon (d) Charles Elton

[1]

Q14.

Which one of the following are at higher risk of extinction due to habitat destruction ? (a) Amphibians (b) Mammals (c) Echinoderms (d) Birds

[1]

Q15.

_____ is/are an ideal disinfectant for waste water. (a) Boiling (b) U-V Rays (c) Ozonisation (d) Chlorination

[1]

Page 2 of 8

Section B

compulsory · 2 marks each · 9 of 1 shown

Q1.

Define gametogenesis.

[2]

Q2.

What is inhibin ?

[2]

Q3.

Differentiate - Leading strand and Lagging strand.

[2]

Q4.

How does Neanderthal man differ from the Modern man in appearance ?

[2]

Q5.

What is Atavism ?

[2]

Q6.

Draw the structure of Lymph node and label the parts. [figure: labelled diagram of a lymph node, to be drawn by the candidate — not printed in the question paper]

[2]

Q7.

Define : Zymology

[2]

Q8.

Differentiate hibernation and aestivation.

[2]

Page 3 of 8

Q9.

What are the gases that cause the Green House Effect ?

[2]

Section B

compulsory · 2 marks each · 9 of 1 shown

Q1.

Define gametogenesis.

[2]

Q2.

What is inhibin ?

[2]

Q3.

Differentiate - Leading strand and Lagging strand.

[2]

Q4.

How does Neanderthal man differ from the Modern man in appearance ?

[2]

Q5.

What is Atavism ?

[2]

Q6.

Draw the structure of Lymph node and label the parts. [figure: labelled diagram of a lymph node, to be drawn by the candidate — not printed in the question paper]

[2]

Q7.

Define : Zymology

[2]

Page 4 of 8

Q8.

Differentiate hibernation and aestivation.

[2]

Q9.

What are the gases that cause the Green House Effect ?

[2]

Section C

compulsory · 3 marks each · 9 of 1 shown

Q1.

Draw Gemmule in sponges and label the parts. [figure: labelled diagram of a gemmule in sponges, to be drawn by the candidate — not printed in the question paper]

[3]

Q2.

What are the three strategies to be implemented in India to attain total reproductive health ?

[3]

Q3.

Why are sex linked recessive characters more common in the male human beings ?

[3]

Q4.

What are the three structural differences between RNA and DNA ?

[3]

Q5.

What do you think about it is not possible to produce vaccine against "common cold" ?

[3]

Page 5 of 8

Q6.

What is SMOG and how is it harmful for us ?

[3]

Q7.

What is gene "knock out" ?

[3]

Q8.

Name the active chemical found in the medicinal plant Rauwolfia Vomitoria. What type of diversity it belongs to ?

[3]

Q9.

Classify the antibiotics based on their action on bacteria.

[3]

Section C

compulsory · 3 marks each · 9 of 1 shown

Q1.

Draw Gemmule in sponges and label the parts. [figure: labelled diagram of a gemmule in sponges, to be drawn by the candidate — not printed in the question paper]

[3]

Q2.

What are the three strategies to be implemented in India to attain total reproductive health ?

[3]

Page 6 of 8

Q3.

Why are sex linked recessive characters more common in the male human beings ?

[3]

Q4.

What are the three structural differences between RNA and DNA ?

[3]

Q5.

What do you think about it is not possible to produce vaccine against "common cold" ?

[3]

Q6.

What is SMOG and how is it harmful for us ?

[3]

Q7.

What is gene "knock out" ?

[3]

Q8.

Name the active chemical found in the medicinal plant Rauwolfia Vomitoria. What type of diversity it belongs to ?

[3]

Q9.

Classify the antibiotics based on their action on bacteria.

[3]

Page 7 of 8

Section D

compulsory · 5 marks each · 5 of 5 shown

Q1.

(a) Describe the structure of the human ovum with a neat labelled diagram. **OR** (b) Give an account on population regulation.

[5]

Q2.

(a) Mention the symptoms of Phenylketonuria and Down's Syndrome. **OR** (b) Explain the experimental proof of DNA replication by Meselson and Stahl.

[5]

Q3.

(a) Darwin's finches and Australian marsupials are suitable examples of adaptive radiation - Justify the statement. **OR** (b) Write a note on the Protozoan diseases.

[5]

Q4.

(a) Difference between Active and Passive immunity. **OR** (b) What are the recombinant vaccines ? Explain their types.

[5]

Q5.

(a) Write the causes for infertility in males and females. **OR** (b) "Alien species invasion is a threat to endemic species" - Substantiate this statement.

[5]

Page 8 of 8