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Biology · Class 12 Science

Rajasthan Rbse 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
8
Total Papers
8
Real Board Papers
0
Sample papers
323
Real-paper Q & A
0
Sample-paper Q & A

Real board-paper questions available, by year

53 Q2026complete
53 Q2025complete
51 Q2024complete
38 Q2023complete
—2022Paper not yet available
—2021Exam cancelled (COVID-19)
30 Q2020complete
30 Q2019complete
30 Q2018complete

2022 — Paper not yet available: This year’s exam was held, but no verified question paper for this subject has been published by any source we check — the official rajeduboard.rajasthan.gov.in and the public past-paper archives. We publish only a paper we can verify against a real printed original — this one will appear here once it is.

2021 — Exam cancelled (COVID-19): RBSE cancelled the Class-12 Senior Secondary Examination in 2021 due to COVID-19 (a Rajasthan State Council of Ministers decision); students were promoted via internal assessment. No exam was administered that year, so there is no genuine previous-year paper to publish.

Rajasthan Board Senior Secondary Examination 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
56
Questions
53
Duration
195 min
Sections
4

The marks / questions / duration above are the official exam pattern. We currently have 53 of this paper’s questions (100% of the full paper), with 53 fully solved. Questions we couldn’t yet extract or verify are held — never shown as complete.

Sections & marks

SectionTypeQuestionsMarks eachTotal
ASection Aobjective38——
BSection Bshort_answer101.515
CSection Clong_answer339
DSection Dessay248
Total5356

The question paper

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

Board Examination

Biology

Rajasthan Board Senior Secondary Examination 2026 · Set ANNUAL

Series/Set: ANNUALRoll No. ________
Time Allowed: 3 hr 15 minMaximum Marks: 56

General Instructions

  1. This question paper contains 53 questions divided into 4 sections — A, B, C, D.
  2. Section A comprises 38 questions (objective).
  3. Section B comprises 10 questions of 1.5 marks each (short_answer).
  4. Section C comprises 3 questions of 3 marks each (long_answer).
  5. Section D comprises 2 questions of 4 marks each (essay).

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

Section A

objective · 38 of 38 shown

Q1.
An example of a parthenocarpic fruit is
  • (a) Banana
  • (b) Apple
  • (c) Strawberry
  • (d) Walnut
[1]
Q2.
Water pollinated plant that grow in fresh water is
  • (a) Zostera
  • (b) Vallisneria
  • (c) Eelgrass
  • (d) Mangrove
[1]
Q3.
Which hormone is involved to induce parturition?
  • (a) Prolactin
  • (b) Adrenaline
  • (c) Oxytocin
  • (d) Progesterone
[1]
Q4.
Some region of chromatin are loosely packed in a typical nucleus, they are called
  • (a) Euchromatin
  • (b) Histone
  • (c) Nucleosome
  • (d) Heterochromatin
[1]
Q5.
Who rediscovered the results of Mendel's inheritance of characters?
  • (a) Devries, Correns and Tschermak
  • (b) Sutton and Boveri
  • (c) Schleiden, Schwann and Morgan
  • (d) Watson and Crick
[1]
Q6.
Genetic disorder which is caused due to the absence of one X-chromosome
  • (a) Down's syndrome
  • (b) Turner's syndrome
  • (c) Klinefelter's syndrome
  • (d) Haemophilia
[1]
Q7.
Probably how many million years ago evolution of jawless fish occurred in geological periods?
  • (a) 500
  • (b) 350
  • (c) 320
  • (d) 200
[1]
Page 1 of 6
Q8.
In ecological terminology, what are green plants called? (a) Producer (b) Primary consumer (c) Secondary consumer (d) Tertiary consumer
[1]
Q9.
Acrosome is found in which part of the human sperm? (a) Tail (b) Middle piece (c) Head (d) Neck
[1]
Q10.
Which of the following is not a part of male reproductive system? (a) Ampulla (b) Prostate (c) Foreskin (d) Bulbourethral gland
[1]
Q11.
If species 'A' + (Positive) and species 'B' - (Negative) in population, the name of interaction will be (a) Mutualism (b) Competition (c) Predation (d) Parasitism
[1]
Q12.
Pyramid of biomass in the sea are generally (a) Straight (b) Upright (c) Invert (d) All kinds
[1]
Q13.
Which of the following is not a sexually transmitted disease? (a) Gonorrhoea (b) Herpes (c) Syphilis (d) Tuberculosis
[1]
Q14.
Which nitrogenous base is found in both DNA and RNA? (a) Cytosine (b) Thymine (c) Uracil (d) All of the above
[1]
Q15.
Microbes (micro-organism) found in the form of biofertilizer is (a) Agrobacterium (b) Bacillus thuringiensis (c) Baculoviruses (d) Rhizobium
[1]
Q16.
Which species of plasmodium causes most severe and fatal malignant malaria? (a) P. Vivax (b) P. Malaria (c) P. Falciparum (d) P. Ovale
[1]
Q17.
Natural cannabinoid is obtained mainly from which part of the cannabis sativa plant? (a) Root (b) Leaf (c) Thalamus (d) Inflorescence
[1]
Q18.
What does the 'co' derives from the EcoRI? (a) Genus (b) Phylum (c) Order (d) Species
[1]
Page 2 of 6
Q19.
Fill in the blank: The ovulation (ovulatory phase) is followed by the luteal phase during which the remaining part of the Graafian follicle transform as ___.
[1]
Q20.
Fill in the blank: Deletion and insertion of base pairs of DNA causes ___ mutation.
[1]
Q21.
Fill in the blank: Some amino acids are coded by more than one codon, for this reason such codons are called ___ code.
[1]
Q22.
Fill in the blank: The dough, which is used to make bread, is fermented by yeast called as ___.
[1]
Q23.
Fill in the blank: The first clinical gene therapy was given in 1990 to a four year girl to cure deficiency of ___.
[1]
Q24.
Fill in the blank: Leydig cells, synthesise and secrete testicular hormone called as ___.
[1]
Q25.
Fill in the blank: The cutting of DNA at specific locations became possible with the discovery of molecular scissors called as ___ enzyme.
[1]
Q26.
Fill in the blank: 'Saheli' named contraceptive pill was developed by Central Drug Research Institute of ___ city in India.
[1]
Q27.
Fill in the blank: When more than one adaptive radiation have occurred in an isolated geographical area, this is called as ___ evolution.
[1]
Q28.
Fill in the blank: The brain capacity of homo habilis man was ___ cc.
[1]
Q29.
Define amniocentesis.
[1]
Page 3 of 6
Q30.
Write the causes of the genetic disorder Klinefelter's syndrome.
[1]
Q31.
Which fungus is used as biological control in the treatment of plant diseases?
[1]
Q32.
Which nematode infected the roots of tobacco plant and causes a great reduction in the yield?
[1]
Q33.
Define immigration.
[1]
Q34.
Which colours cannot be discriminated by person in colour blindness?
[1]
Q35.
Which pathogenic bacterium causes typhoid fever in human?
[1]
Q36.
Give an example of commensalism.
[1]
Q37.
The protein that controls cotton bollworm is encoded by which gene?
[1]
Q38.
What does 'A' and 'B' represent in the above mentioned diagram of the mature embryosac? Write name for each.
[1]
Section B

short_answer · 1.5 marks each · 10 of 10 shown

Q1.
Write parasitism by giving example in population interaction.
[2]
Page 4 of 6
Q2.
Explain In-situ conservation. How many national parks are currently in India?
[2]
Q3.
Explain sex determination in honey bee.
[2]
Q4.
Explain features required to facilitate origin of replication (ori) when cloning into vector.
[2]
Q5.
Explain, how transgenic animals are used for producing biological products?
[2]
Q6.
What is called biolistic or gene gun? Explain it.
[2]
Q7.
Explain latitudinal gradient pattern of biodiversity.
[2]
Q8.
Draw a labelled diagram of schematic representation of spermatogenesis in human beings.
[2]
Q9.
Match the items in Column - I with those in Column - II by writing the corresponding serial number within brackets. Column - I: A) Homo habilis B) Homo erectus C) Dryopithecus Column - II: i) Probably ate meat ii) Probably did not eat meat iii) Was more ape-like
[2]
Q10.
Draw a labelled diagram of structure of a nucleosome.
[2]
Page 5 of 6
Section C

long_answer · 3 marks each · 3 of 3 shown

Q1.
Define pollination. Explain chasmogamous and cleistogamous flowers. **OR** Define transcription. Draw a line diagram of process of transcription in bacteria.
[3]
Q2.
Define agents of pollination. Explain pollination in wind pollinated plants. **OR** Write any one salient feature of human genome project. Draw labelled diagram structure of t-RNA adaptor molecule.
[3]
Q3.
What do you understand by sewage? Why can sewage be harmful to us? Explain. **OR** Explain role of microbes as biocontrol agent with the help of example.
[3]
Section D

essay · 4 marks each · 2 of 2 shown

Q1.
i) Draw schematic diagram of pyramid of number. ii) Explain ethos (nature) of aquatic ecosystem by example. **OR** i) Draw schematic diagram of pyramid of biomass. ii) Describe process and products of decomposition.
[4]
Q2.
i) Explain two symptoms of typhoid disease. ii) Explain main sources of typhoid diseases infection. **OR** i) Explain two symptoms of malaria disease. ii) Explain different stages in life cycle of plasmodium.
[4]
Page 6 of 6