Botany · Class 12 Science

Tamil Nadu Dge Class 12 Botany — 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: 332
Real-paper Q & A: 0
Sample-paper Q & A

Real board-paper questions available, by year

38 Q2026complete

38 Q2025complete

38 Q2024complete

37 Q2023complete

38 Q2022complete

—2021Not available

38 Q2020complete

19 Q2019complete

24 Q2018complete

30 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: 4

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	choice	9	2	18
CSection C	choice	9	3	27
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

Botany

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 4 sections — A, B, C, D.
Section A comprises 15 questions of 1 mark each (compulsory).
Section B comprises 9 questions of 2 marks each (choice).
Section C comprises 9 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.

An eminent Indian embryologist is :

(a) M.S. Swaminathan
(b) S.R. Kashyap
(c) K.C. Mehta
(d) P. Maheswari

[1]

Q2.

The test cross involves :

(a) Crossing the F1 hybrid with a double recessive genotype
(b) Crossing between two genotypes with recessive trait
(c) Crossing between two genotypes with dominant trait
(d) Crossing between two F1 hybrids

[1]

Q3.

Removal of introns and joining of exons in a defined order during transcription is called :

(a) Inducing
(b) Splicing
(c) Slicing
(d) Looping

[1]

Q4.

The correct order of haploid, diploid and triploid structure in fertilized embryo sac is :

(a) Antipodal, Synergid and PEN
(b) Synergid, Zygote and PEN
(c) Synergid, Polar nuclei and Zygote
(d) Synergid, Antipodal and Polar nuclei

[1]

Q5.

The enzyme which eliminates the torsional stress caused by the unwinding of double helix during the DNA replication is :

(a) Topoisomerase
(b) DNA Polymerase
(c) RNA Primase
(d) Ligase

[1]

Q6.

Which one of the following is an example of polygenic inheritance ?

(a) Pod shape in garden pea
(b) Flower colour in Mirabilis jalapa
(c) Skin colour in humans
(d) Production of male honeybee

[1]

Page 1 of 6

Q7.

Genetic engineering is : (a) Production of alcohol by using micro-organisms. (b) Making artificial genes. (c) Making artificial limbs, diagnostic instruments such as ECG, EEG etc., (d) Hybridization of DNA of one organism to that of the others.

[1]

Q8.

Pedogenesis refers to : (a) Population (b) Fossils (c) Soil (d) Water

[1]

Q9.

Match List - I with List - II : List - I (1) Sterilization of culture room (2) Fusion of protoplast (3) Solidifying agent (4) Isolation of protoplast List - II (i) Macerozyme (ii) Ethanol (iii) Agar (iv) Polyethylene Glycol (a) (1)-(ii), (2)-(iv), (3)-(iii), (4)-(i) (b) (1)-(i), (2)-(iv), (3)-(iii), (4)-(ii) (c) (1)-(iv), (2)-(iii), (3)-(ii), (4)-(i) (d) (1)-(i), (2)-(ii), (3)-(iii), (4)-(iv)

[1]

Q10.

Pond is a type of : (a) Marine ecosystem (b) Forest ecosystem (c) Freshwater ecosystem (d) Grassland ecosystem

[1]

Q11.

In which technique is Ethidium Bromide used ? (a) Polymerase Chain Reaction (b) Southern Blotting Technique (c) Agarose Gel Electrophoresis (d) Western Blotting Technique

[1]

Q12.

Which one is in descending order of a food chain ? (a) Tertiary consumers → Secondary consumers → Primary consumers → Producers (b) Producers → Secondary consumers → Primary consumers → Tertiary consumers (c) Tertiary consumers → Producers → Primary consumers → Secondary consumers (d) Tertiary consumers → Primary consumers → Secondary consumers → Producers

[1]

Q13.

Plant indicator for SO2 pollution is : (a) Gladiolus, Eucalyptus (b) Petunia, Chrysanthemum (c) Robinia pseudoacacia, Casuarina (d) Lichens, Rose

[1]

Q14.

Plants having similar genotypes produced by plant breeding are called : (a) Autopolyploid (b) Clone (c) Genome (d) Haploid

[1]

Q15.

Which one of the following matches is correct ? (a) Steveocide - Natural Sweetener (b) Palmyra - Native of Brazil (c) Palmyra sap - Fermented to give ethanol (d) Saccharum - Abundant in Kanyakumari

[1]

Page 2 of 6

Section B

choice · 2 marks each · 9 of 9 shown

Q1.

Name any two nutrient media that you have studied.

[2]

Q2.

Write the names of the scientists who rediscovered Mendelism.

[2]

Q3.

Draw and label a cut opened Dicot seed.

[2]

Q4.

What are agrochemicals ?

[2]

Q5.

Name the humors that are responsible for the health of human beings.

[2]

Q6.

A person gets irritation while applying chemical dye. What would be your suggestion for alternative ?

[2]

Q7.

What is vivipary ?

[2]

Q8.

What is the difference between missense and nonsense mutation ?

[2]

Page 3 of 6

Q9.

In a grassland ecosystem an organism of (T3) third trophic level derives 400 joules of energy. How much energy would be there in first trophic (T1) level ? Calculate.

[2]

Section C

choice · 3 marks each · 9 of 9 shown

Q1.

What is gene mapping ? Write its uses.

[3]

Q2.

Differentiate incomplete dominance with co-dominance.

[3]

Q3.

List out the benefits of seed treatment.

[3]

Q4.

What is bioremediation ? Give an example of bioremediation.

[3]

Q5.

Give four examples of plants cultivated in commercial agroforestry.

[3]

Q6.

List out the advantages of Artificial seeds.

[3]

Page 4 of 6

Q7.

Name any three plants found in Sub-Alpine forests.

[3]

Q8.

Give short note on pollen kitt.

[3]

Q9.

Draw and label the structure of epiphytic plant Vanda.

[3]

Section D

compulsory · 5 marks each · 5 of 5 shown

Q1.

(a) Bring out the inheritance of chloroplast gene with an example. **OR** (b) List out the applications of single cell protein.

[5]

Q2.

(a) Explain afforestation with case studies. **OR** (b) Explain the basic concepts involved in plant tissue culture.

[5]

Q3.

(a) With a suitable diagram explain the structure of an ovule. **OR** (b) Which is called as the "King of Spices" ? Write its origin and uses.

[5]

Page 5 of 6

Q4.

(a) List out the traditional methods of seed protection. **OR** (b) What is negative interaction ? Tabulate its types and effects with example.

[5]

Q5.

(a) Mention the name of man-made cereal. How is it formed ? **OR** (b) Shape of pyramid in a particular ecosystem is always different in shape. Explain with example.

[5]

Page 6 of 6