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Biology · Class 12 Science

Chhattisgarh Cgbse 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
9
Total Papers
9
Real Board Papers
0
Sample papers
251
Real-paper Q & A
0
Sample-paper Q & A

Real board-paper questions available, by year

33 Q2026complete
26 Q2025complete
26 Q2024complete
26 Q2023complete
26 Q2022complete
26 Q2021complete
26 Q2020complete
31 Q2019complete
31 Q2018complete

CGBSE 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
33
Duration
180 min
Sections
6

The marks / questions / duration above are the official exam pattern. We currently have 33 of this paper’s questions (100% of the full paper), with 33 fully solved. Questions we couldn’t yet extract or verify are held — never shown as complete.

Sections & marks

SectionTypeQuestionsMarks eachTotal
Q1-Section-A (MCQ)Section Q1-Section-A (MCQ)compulsory10110
Q1-Section-B (VSA, one word/one sentence)Section Q1-Section-B (VSA, one word/one sentence)compulsory515
Q2-Q8 (Short Answer, max 30 words)Section Q2-Q8 (Short Answer, max 30 words)compulsory7214
Q9-Q14 (Short Answer, max 50 words)Section Q9-Q14 (Short Answer, max 50 words)compulsory6318
Q15-Q16 (Long Answer, max 75-100 words)Section Q15-Q16 (Long Answer, max 75-100 words)compulsory248
Q17-Q19 (Long Answer, max 100-150 words)Section Q17-Q19 (Long Answer, max 100-150 words)compulsory3515
Total3370

The question paper

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

Board Examination

Biology

CGBSE Intermediate Board 2026 · Set ANNUAL

Series/Set: ANNUALRoll No. ________
Time Allowed: 3 hoursMaximum Marks: 70

General Instructions

  1. This question paper contains 33 questions divided into 6 sections — Q1-Section-A (MCQ), Q1-Section-B (VSA, one word/one sentence), Q2-Q8 (Short Answer, max 30 words), Q9-Q14 (Short Answer, max 50 words), Q15-Q16 (Long Answer, max 75-100 words), Q17-Q19 (Long Answer, max 100-150 words).
  2. Section Q1-Section-A (MCQ) comprises 10 questions of 1 mark each (compulsory).
  3. Section Q1-Section-B (VSA, one word/one sentence) comprises 5 questions of 1 mark each (compulsory).
  4. Section Q2-Q8 (Short Answer, max 30 words) comprises 7 questions of 2 marks each (compulsory).
  5. Section Q9-Q14 (Short Answer, max 50 words) comprises 6 questions of 3 marks each (compulsory).
  6. Section Q15-Q16 (Long Answer, max 75-100 words) comprises 2 questions of 4 marks each (compulsory).
  7. Section Q17-Q19 (Long Answer, max 100-150 words) 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

Q1.
Egg apparatus is made up of :
  • (a) 2 synergid cells + 2 egg cells
  • (b) 1 synergid cell + 2 egg cells
  • (c) 2 synergid cells + 1 egg cell
  • (d) 1 synergid cell + 1 egg cell
[1]
Q2.
Leydig cells are found :
  • (a) in liver
  • (b) in testes
  • (c) in kidney
  • (d) in uterus
[1]
Q3.
The ratio of phenotypes in dihybrid cross is :
  • (a) 9:3:3:1
  • (b) 3:1
  • (c) 1:2:1
  • (d) 1:1:1:1
[1]
Q4.
Name the scientist who used viruses to prove that DNA is a hereditary material :
  • (a) Watson and Crick
  • (b) Hershey and Chase
  • (c) Meselson and Stahl
  • (d) Avery, Macleod and Macarty
[1]
Q5.
Test for AIDS is :
  • (a) Widal test
  • (b) Biopsy test
  • (c) ELISA test
  • (d) CRY organism test
[1]
Q6.
Yeast is used in the production of :
  • (a) ethyl alcohol
  • (b) paneer
  • (c) acetic acid
  • (d) curd
[1]
Page 1 of 6
Q7.
The RNA transcripted by RNA polymerase I is : (a) 28S rRNA (b) tRNA (c) Sn rRNA (d) mRNA
[1]
Q8.
Two polypeptide chains of human insulin are linked to each other : (a) by phosphodiester bonds (b) by convalent bonds (c) by disulphide bonds (d) by hydrogen bonds
[1]
Q9.
If 20 joules energy is received in producer level, then how many amount of energy in the form of food will get to Peacock in the following food chain? Plant → Rat → Snake → Peacock (a) 0.02 joule (b) 0.2 joule (c) 0.002 joule (d) 0.0002 joule
[1]
Q10.
African catfish brought for aquaculture purpose is posing a threat to the native fishes in our river : (a) Clarias (b) Oriza (c) Albacar (d) Rospo
[1]
Q11.
Write the full form of MTP.
[1]
Q12.
Write the name of that inheritable disorder in which rate of synthesis of any one chain (α and β) of globin responsible for the synthesis of haemoglobin is decreasing.
[1]
Q13.
Write the name of the enzyme which does DNA replication.
[1]
Q14.
Write the name of Typhoid disease-causing micro-organism.
[1]
Q15.
CRY gene protects which type of crop by bollworms?
[1]
Page 2 of 6
Section B

Q1.
What is Fertilization?
[2]
Q2.
What is test cross?
[2]
Q3.
How are Exons different from Introns in hnRNA? Write logic to this.
[2]
Q4.
Draw a sketch of grassland pyramid of number. Note : Visually impaired students will define instead of drawing.
[2]
Q5.
How do microorganisms play an important role in disease control?
[2]
Q6.
Which microorganism produces the following chemicals? Write their uses : (a) Acetic acid (b) Streptokinase
[2]
Q7.
Write two characteristics of Dryopithecus.
[2]
Page 3 of 6
Section C

Q1.
Explain the following phases of Oogenesis : (i) Multiplication phase (ii) Growth phase (iii) Maturation phase
[3]
Q2.
Make a pedigree analysis chart of the offsprings produced by crossing between colour blind male and carrier female. Note : Visually impaired students will describe instead of chart.
[3]
Q3.
What is Convergent Evolution? Give an example.
[3]
Q4.
Write three differences between parasitism and symbiotism.
[3]
Q5.
Write three natural ways of prevention from unwanted pregnancy.
[3]
Q6.
What is called national park? What is its role in life conservation?
[3]
Page 4 of 6
Section D

Q1.
Describe the Watson-Crick model of the structure of DNA. **OR** Describe the transcription unit of DNA.
[4]
Q2.
What is Biotechnology? Write its three applications in the field of medicine. **OR** What are GM Plants? Write its uses in the field of agriculture.
[4]
Section E

Q1.
Drug and alcohol use is more likely to develop during adolescence. What are the reasons that attract towards drug or alcohol? List five reasons. **OR** Drug and alcohol use chances are more likely to develop during adolescence. What advice will you give to your friends to prevent them from its harmful effects? Write any five advices.
[5]
Q2.
Draw the structure of a mature pollen grain. Label the following parts and write their functions : (i) Exine (ii) Tube nucleus (iii) Germ pore **OR** Draw the structure of a mature embryo sac. Label the following parts and write their functions : (i) Egg cell (ii) Antipodal cell (iii) Polar nuclei Note : Visually impaired students will explain the following and write their functions in place of drawing structure.
[5]
Page 5 of 6
Q3.
What is called Host Cell? Write the three methods by which foreign DNA can be introduced into host cell. **OR** What is DNA Recombinant Technique? Write the three enzymes and their functions used in this technique.
[5]
Page 6 of 6