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Biology · Class 12 Science

Assam Ahsec 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
216
Real-paper Q & A
0
Sample-paper Q & A

Real board-paper questions available, by year

—2026Paper not yet available
24 Q2025complete
41 Q2024complete
24 Q2023complete
24 Q2022complete
—2021Exam cancelled (COVID-19)
24 Q2020complete
24 Q2019complete
32 Q2018complete

2026 — Paper not yet available: This year’s exam was held, but neither AHSEC’s official site nor any source we check has published the question paper yet. 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): AHSEC cancelled the HS Final (Class-12) examination in 2021 due to COVID-19; no annual question paper was conducted or printed that year, so none exists to publish. Results were declared using a formula based on HSLC marks, institutional practicals, and internal assessment.

AHSEC Higher Secondary (HS) Final Examination 2026 · Set ANNUAL

Real board examination

This paper has 1 question on a topic removed in CBSE’s 2023-24 syllabus update (each marked Not in syllabus). It’s kept for historical accuracy — the exam really asked it that year — but isn’t in the current syllabus and doesn’t count toward a concept’s importance. Switch to to focus on what’s still examinable.

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
24
Duration
180 min
Sections
2

The marks / questions / duration above are the official exam pattern. We currently have 23 of this paper’s questions (96% of the full paper), with 23 fully solved. Questions we couldn’t yet extract or verify are held — never shown as complete.

Sections & marks

SectionTypeQuestionsMarks eachTotal
BSection Bsubjective15——
ZSection Zsubjective9——
Total2470

The question paper

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

Board Examination

Biology

AHSEC Higher Secondary (HS) Final Examination 2026 · Set ANNUAL

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

General Instructions

  1. This question paper contains 24 questions divided into 2 sections — B, Z.
  2. Section B comprises 15 questions (subjective).
  3. Section Z comprises 9 questions (subjective).

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

Section B

subjective · 14 of 15 shown

Q1.
What is sporopollenin?
[1]
Q2.
Who proposed mutation theory?
[1]
Q3.
Name one free-living nitrogen-fixing bacteria.
[1]
Q4.
What is the function of DNA ligase?
[1]
Q5.
Write briefly about the principles of biotechnology.
[2]
Q6.
What is triple fusion? Write the significance of it.
[2]
Page 1 of 4
Q7.
What do you mean by false fruit? Give two examples of false fruit.
[2]
Q8.
"Pyramid of energy is always upright." Explain.
[2]
Q9.
Write the scientific names and uses of the following plants (any three): (a) Sissoo (b) Cinchona (c) Atropa (d) Holong
[3]
Q10.
What are biopesticides? Write briefly on biopesticides with examples.
[3]
Q11.
Explain briefly (any two): (a) Biopiracy (b) Bt cotton (c) Gene gun (d) PCR
[4]
Q12.
Discuss about the chemical evolution of life on the earth.
[4]
Q13.
Describe the structure of ecosystem.
[4]
Page 2 of 4
Q14.
Write an account of biotechnological application in medicine.
[5]
Section Z

subjective · 9 of 9 shown

Q1.
Fill in the blanks (any two): (a) Fertilization takes place in the ___. (b) Down's syndrome disorder was first described by ___. (c) ___ enzyme is used to join discontinuously synthesized fragments of DNA. (d) Malaria is caused by the bite of infected female ___ mosquito.
[2]
Q2.
Answer any two of the following questions: (a) What is an allele? (b) What is mutation? (c) What is DNA replication? (d) What is transgenic animal?
[2]
Q3.
Draw a labelled diagram of a DNA double-helical structure.
[3]
Q4.
What is DNA fingerprinting? Mention its applications.
[3]
Q5.
Write down the systematic position of muga silkworm.
⚠ This question is not in the current syllabus — Sericulture (muga silkworm taxonomy and silkworm diseases) belongs to applied/economic zoology under the old 'Strategies
[3]
Page 3 of 4
Q6.
Write the difference between (any two): (a) Spermatogenesis and Oogenesis (b) Monohybrid and Dihybrid cross (c) Deoxyribonucleic acid (DNA) and Ribonucleic acid (RNA) (d) Innate and Acquired immunity
[4]
Q7.
Explain Mendel's law of dominance using monohybrid cross.
[5]
Q8.
Describe the process of gametogenesis.
[5]
Q9.
Answer any four of the following questions: (a) What is menstrual cycle? (b) What is meant by linkage? (c) Write the composition of a polynucleotide chain. (d) Mention the different symptoms of malaria. (e) What are the four major factors which affect the population density? (f) What is splicing?
[8]
Page 4 of 4