Biology · Class 12 Science

Haryana Bseh Class 12 Biology — 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.

2017–2026
Years of papers: 8
Total Papers: 8
Real Board Papers: 0
Sample papers: 273
Real-paper Q & A: 0
Sample-paper Q & A

Real board-paper questions available, by year

39 Q2026complete

35 Q2025complete

39 Q2024complete

34 Q2023complete

—2022Not available

—2021Not available

34 Q2020complete

34 Q2019complete

29 Q2018complete

29 Q2017complete

BSEH Intermediate 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: 39
Duration: 180 min
Sections: 5

The marks / questions / duration above are the official exam pattern. We currently have 39 of this paper’s questions (100% of the full paper), with 39 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	18	1	18
BSection B	compulsory	7	2	14
CSection C	compulsory	5	3	15
DSection D	compulsory	6	—	—
ESection E	compulsory	3	5	15
Total		39		70

The question paper

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

Board Examination

Biology

BSEH Intermediate Board 2026 · Set ANNUAL

Series/Set: ANNUALRoll No. ________

Time Allowed: 3 hoursMaximum Marks: 70

General Instructions

This question paper contains 39 questions divided into 5 sections — A, B, C, D, E.
Section A comprises 18 questions of 1 mark each (compulsory).
Section B comprises 7 questions of 2 marks each (compulsory).
Section C comprises 5 questions of 3 marks each (compulsory).
Section D comprises 6 questions (compulsory).
Section E comprises 3 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 · 22 of 18 shown

Q1.

Pollen grains retain viability for months in plant belonging to different families given below :

(i) Solanaceae
(ii) Leguminosae
(iii) Gramineae
(iv) Rosaceae
(v) Liliaceae Correct option is :
(a) (i),
(ii) &
(v)
(b) (i),
(ii) &
(iv)
(c) (ii), (iv),
(v)
(d) (i), (iii), (v)

[1]

Q2.

The structure of bilobed anther consist of :

(a) 2 thecae, 2 sporangia
(b) 4 thecae, 4 sporangia
(c) 4 thecae, 2 sporangia
(d) 2 thecae, 4 sporangia

[1]

Q3.

Terminator codon is :

(a) UAA
(b) UAG
(c) UGA
(d) All of these

[1]

Q4.

Which one of the following will not allow a molecule to act as a genetic material ?

(a) Ability to generate its replication
(b) Ability to mutate
(c) Ability to express itself in the form of Mendelian character
(d) Ability to easily break down structurally and chemically

[1]

Q5.

Which one is the pathogen of amoebic dysentery ?

(a) Wuchereria
(b) Plasmodium
(c) Ascaris
(d) Entamoeba histolytica

[1]

Q6.

Which bacterial species acts as an bio-insecticide ?

(a) LAB
(b) Bacillus thuringiensis
(c) Acetobacter aceti
(d) Streptococcus

[1]

Page 1 of 6

Q7.

Which of the following enzymes is used to dissolve fungal cell wall ? (a) Lysozyme (b) Cellulose (c) Chitinase (d) Proteases

[1]

Q8.

The primary productivity in an ecosystem is expressed as : (a) gm-2yr-1 (b) gm-2yr (c) Kcalm-2yr (d) Kcalm-2

[1]

Q9.

Starting point in the detritus food chain is : (a) Green plants (b) Dead organic matter (c) Phytoplankton (d) Shrubs bushes

[1]

Q10.

Name the oral pill which is taken by Indian women once a week.

[1]

Q11.

Mention the type of evolution that has brought the similarity as seen in potato tuber and sweet potato.

[1]

Q12.

What is the botanical name of baker's yeast ?

[1]

Q13.

Zygote divide to form ............. which is implanted in uterus.

[1]

Q14.

............. A cross between an organism of an unknown genotype and homozygous recessive organism.

[1]

Q15.

Large scale production of biotechnological products involve use of ............ .

[1]

Q16.

Assertion (A) : Medical termination of pregnancy (MTP) is done to get rid of unwanted pregnancies. Reason (R) : It is usually done after 24 weeks of pregnancy. (a) Assertion (A) and Reason (R) both are true and Reason (R) is the correct explanation of Assertion (A). (b) Assertion (A) and Reason (R) both are true, but Reason (R) is not the correct explanation of Assertion (A). (c) Assertion (A) is true, but Reason (R) is false. (d) Assertion (A) is false, but Reason (R) is true.

[1]

Page 2 of 6

Q17.

Assertion (A) : For DNA sequencing the total DNA from a cell is isolated and converted into random fragments of relatively smaller sizes. Reason (R) : Human genome is said to have approximately 3 x 10⁹ bP and total estimate cost for sequencing is very high. (a) Assertion (A) and Reason (R) both are true and Reason (R) is the correct explanation of Assertion (A). (b) Assertion (A) and Reason (R) both are true, but Reason (R) is not the correct explanation of Assertion (A). (c) Assertion (A) is true, but Reason (R) is false. (d) Assertion (A) is false, but Reason (R) is true.

[1]

Q18.

Assertion (A) : In bioreactors, raw materials are biologically converted into desired products. Reason (R) : In bioreactors optimum growth conditions for microbes such as temperature, pH, substrate, salt etc. are available. (a) Assertion (A) and Reason (R) both are true and Reason (R) is the correct explanation of Assertion (A). (b) Assertion (A) and Reason (R) both are true, but Reason (R) is not the correct explanation of Assertion (A). (c) Assertion (A) is true, but Reason (R) is false. (d) Assertion (A) is false, but Reason (R) is true.

[1]

Q19.

Case Study - 1. Read the passage given below and answer the following questions : In case of an infertile couple male has abnormally low sperm count in ejaculation and female has blocked oviduct has spermicidal secretions in vagina but can provide suitable environment for development of embryo. What is infertility ?

[1]

Q20.

Refer to the Case Study - 1 passage above (infertile couple with low sperm count and blocked oviduct with spermicidal vaginal secretions). Suggest ART used in above case.

[1]

Q21.

Case Study - 2. Read the passage given below and answer the following questions : Rahul, a 17 years old high school student, has started experimenting with cannabis with his friends. He feels temporary euphoria but soon experiences withdrawal symptoms when he tries to stop. Rahul's habit affect his studies and relationship. Drug abuse can lead to addiction and serious health issues. What is cannabinoid drug ?

[1]

Q22.

Refer to the Case Study - 2 passage above (Rahul, a 17-year-old experimenting with cannabis). What are the psychological effects of drug abuse ?

[1]

Section B

compulsory · 2 marks each · 9 of 7 shown

Q1.

State the role of biolistic gun in biotechnology experiments. Microparticles of which element are used in this technique ?

[2]

Q2.

Differentiate perisperm and pericarp. **OR** Differentiate hypocotyl and epicotyl.

[2]

Page 3 of 6

Q3.

Why are both strands of DNA not copied during transcription ?

[2]

Q4.

Describe Phenylketonuria. **OR** Give a brief account of mutation.

[2]

Q5.

Name various primary and secondary lymphoid organs.

[2]

Q6.

Draw well labelled diagram of E.Coli cloning vector PBR 322 showing restriction sites and antibiotic resistant gene. **OR** Why does Bt (cotton crop) toxin not kill bacillus but kills insects ?

[2]

Q7.

Identify a b in given figure representing proportionate number of major vertebrate.

[2]

Q8.

Refer to the Case Study - 1 passage above (infertile couple with low sperm count and blocked oviduct with spermicidal vaginal secretions). What treatment options are available for low sperm count ? **OR** What are ICSI and IUI ?

[2]

Q9.

Refer to the Case Study - 2 passage above (Rahul, a 17-year-old experimenting with cannabis). How did drug abuse affect Rahul's life ? **OR** What can help drug addicts recover ?

[2]

Page 4 of 6

Section C

compulsory · 3 marks each · 5 of 5 shown

Q1.

Define ecological pyramid and describe with examples pyramid of number and biomass.

[3]

Q2.

Describe the ex-situ conservation of biodiversity. **OR** What are the major causes of species losses in a geographical region ?

[3]

Q3.

Name the bioactive molecules produced by streptococcus, monascus and trichoderma.

[3]

Q4.

Differentiate divergent convergent evolution.

[3]

Q5.

Describe the important goals of human genome project. **OR** Mention three applications of DNA finger printing technique.

[3]

Page 5 of 6

Section D

compulsory · 3 of 6 shown

Q1.

(a) Give a schematic representation showing the events of spermatogenesis in humans. (3) (b) Describe structure of human sperm. (2) **OR** Describe the structure of pollen grain in detail.

[5]

Q2.

What is an operon ? Explain the lac-operon model in E.Coli. **OR** Give a brief account of the process of transcription in prokaryotes.

[5]

Q3.

What is gene therapy ? Illustrate using the example of ADA deficiency. **OR** Compare contrast the advantages disadvantages of production of genetically modified crops.

[5]

Page 6 of 6