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Biology · Class 12 Science

Jharkhand Jac 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.

2018–2026
Years of papers
7
Total Papers
7
Real Board Papers
0
Sample papers
306
Real-paper Q & A
0
Sample-paper Q & A

Real board-paper questions available, by year

48 Q2026complete
48 Q2025complete
48 Q2024complete
54 Q2023complete
—2022Not available
—2021Not available
36 Q2020complete
36 Q2019complete
36 Q2018complete

JAC 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
—
Questions
—
Duration
—
Sections
—

The marks / questions / duration above are the official exam pattern. We currently have 48 of this paper’s questions, with 48 fully solved. Questions we couldn’t yet extract or verify are held — never shown as complete.

The question paper

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

Board Examination

Biology

JAC Intermediate Board 2026 · Set ANNUAL

Series/Set: ANNUALRoll No. ________
Time Allowed: —Maximum Marks: —
Section A

Q1.
The remaining part of Graafian follicle, after ovulation is termed as
  • (a) Primary follicle
  • (b) Stroma
  • (c) Corpus albicans
  • (d) Corpus luteum
[1]
Q2.
Wings of bat and wings of insects have similar functions, so they are examples of
  • (a) Homologous organs
  • (b) Analogous organs
  • (c) Vestigeal organs
  • (d) Connecting links
[1]
Q3.
The cells of endosperm of a plant have 27 chromosomes. What will be the number of chromosomes in its gametes?
  • (a) 18
  • (b) 9
  • (c) 36
  • (d) 27
[1]
Q4.
The technique by which sperm is directly injected into the ovum, is
  • (a) ZIFT
  • (b) GIFT
  • (c) ZIUT
  • (d) ICSI
[1]
Q5.
When the genotype of an organism contains two identical alleles, the organism is considered as
  • (a) Homozygous
  • (b) Heterozygous
  • (c) Hemizygous
  • (d) Pleiotropy
[1]
Q6.
Which one is not a part of fallopian tube?
  • (a) Isthmus
  • (b) Ampulla
  • (c) Infundibulum
  • (d) Cervix
[1]
Q7.
Crosses between F1 offspring and either of their parents are called as
  • (a) Inbreeding
  • (b) Back cross
  • (c) Dihybrid cross
  • (d) Test cross
[1]
Page 1 of 6
Q8.
In split genes, the exons are displayed as (a) Introns (b) Non-coding sequences (c) Coding sequences (d) Operons
[1]
Q9.
Which enzyme helps in the separation of both strands of DNA in DNA replication? (a) Helicase (b) DNA polymerase (c) Topoisomerase (d) DNA ligase
[1]
Q10.
Which antibody molecule is found to be present in colostrum? (a) IgA (b) IgM (c) IgE (d) IgG
[1]
Q11.
Contact inhibition is a property related to (a) Normal cells (b) Cancerous cells (c) Hepatic cells (d) Macrophages
[1]
Q12.
More than two alternate forms of a gene present on the same locus are called as (a) Multiple alleles (b) Epistatic genes (c) Supplementary genes (d) Linked genes
[1]
Q13.
A typical nucleosome consists of (a) 50 base pair of DNA helix (b) 100 base pair of DNA helix (c) 150 base pair of DNA helix (d) 200 base pair of DNA helix
[1]
Q14.
The technique of DNA fingerprinting is based on the principle of (a) Similarities in DNA sequences (b) Differences in DNA sequences (c) Polymorphism in DNA sequences (d) Differences in proteins
[1]
Q15.
Male gametes in angiosperms are formed by the division of (a) Vegetative cell (b) Generative cell (c) Microspore mother cell (d) Megaspore mother cell
[1]
Q16.
Rheumatoid arthritis is which type of disease? (a) Sex-linked disease (b) Genetic disease (c) Viral disease (d) Autoimmune disease
[1]
Q17.
Red data book collects the record of which of the following? (a) Red flowered plants (b) Aquatic animals (c) Endangered plants and animals (d) Natural resources
[1]
Page 2 of 6
Q18.
The Bt gene is isolated from which organism? (a) E.coli (b) Lactobacillus (c) Streptococcus cerevisae (d) Bacillus thuringiensis
[1]
Q19.
Gel electrophoresis is used for (a) Isolation of DNA molecule (b) Cutting of DNA into fragments (c) Separation of DNA fragments according to their size (d) Amplification of gene of interest
[1]
Q20.
C-peptide of human insulin is (a) A part of mature insulin molecule (b) Responsible for disulphide bridge formation (c) Removed during maturation of pro-insulin to insulin (d) Responsible for biological activity
[1]
Q21.
Which is used to silence genes in RNA interference? (a) ssDNA (b) dsDNA (c) dsRNA (d) ssRNA
[1]
Q22.
Cyanobacteria are useful biofertilizers in the field of (a) Wheat (b) Paddy (c) Maize (d) Sugarcane
[1]
Q23.
Name the interaction in which one species receives benefit and other is neither harmed nor benefitted. (a) Mutualism (b) Ammensalism (c) Competition (d) Commensalism
[1]
Q24.
The logistic population growth is expressed by which equation? (a) dN/dt = rN (b) dN/dt = rN(K - N)/K (c) dN/dt = rN(N - K)/K (d) dN/dt = (b - d)N
[1]
Q25.
What is the percentage of photosynthetically active radiation (PAR) captured by plants for the synthesis of organic matters? (a) 100% (b) 50% (c) 1 - 5% (d) 2 - 10%
[1]
Section B

Q1.
Where is filiform apparatus located? What is the role of filiform apparatus?
[1]
Page 3 of 6
Q2.
What is chromosomal disorder? Give one example.
[1]
Q3.
Name the plant from which morphine is obtained.
[1]
Q4.
What is Allergy?
[1]
Q5.
What is brood parasitism? Give one example.
[1]
Q6.
What is the number of chromosomes in spermatogonial cells and spermatids of a human?
[1]
Q7.
What is vaccination?
[1]
Q8.
Which theory was given by Charles Darwin?
[1]
Q9.
Design a food chain for an aquatic ecosystem.
[1]
Q10.
What is microsporogenesis? Where does it occur in angiosperms? What is its significance?
[3]
Q11.
Write the function of the following: (i) Acrosome (ii) Sperm tail (iii) Sertoli cells.
[3]
Page 4 of 6
Q12.
Write three differences between homologous and analogous organs.
[3]
Q13.
Explain the law of dominance with the help of monohybrid cross.
[3]
Q14.
Explain with example: (i) Hotspots (ii) Sacred grooves
[3]
Q15.
What is gene therapy? Write about the first clinical case for which gene therapy was used.
[3]
Q16.
Describe three characteristics of insect pollinated flowers.
[3]
Q17.
In the given figure of the nucleosome model of DNA packaging, label A, B and C:
[3]
Q18.
(i) Name the technique involved in amplification of DNA. (ii) Explain the three main steps of the technique with an appropriate diagram.
[5]
Page 5 of 6
Q19.
(i) What is immunity? (ii) Name the types of immunity. (iii) Write the chemical nature of an antibody. (iv) Draw a well labelled diagram of an antibody molecule.
[5]
Q20.
(i) What is DNA fingerprinting? (ii) What are the steps in DNA fingerprinting? (iii) Write two applications of DNA fingerprinting.
[5]
Q21.
(i) What is biodiversity? (ii) What are the ways to conserve biodiversity?
[5]
Q22.
Who demonstrated the semi-conservative replication of DNA? Explain the procedure in detail.
[5]
Q23.
What does S-shaped pattern of population growth represent? How is J-shaped pattern different from it and why? Explain with the help of appropriate diagram.
[5]
Page 6 of 6