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Zoology · Class 12 Science

Mahe Dhse Class 12 Zoology — 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.

2013–2026
Years of papers
14
Total Papers
14
Real Board Papers
0
Sample papers
264
Real-paper Q & A
0
Sample-paper Q & A

Real board-paper questions available, by year

20 Q2026complete
20 Q2025complete
20 Q2024complete
20 Q2023complete
20 Q2022complete
31 Q2021complete
20 Q2020complete
18 Q2019complete
18 Q2018complete
17 Q2017complete
16 Q2016complete
16 Q2015complete
13 Q2014complete
15 Q2013complete

Kerala DHSE Plus Two 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
30
Questions
20
Duration
120 min
Sections
3

The marks / questions / duration above are the official exam pattern. We currently have 20 of this paper’s questions (100% of the full paper), with 20 fully solved. Questions we couldn’t yet extract or verify are held — never shown as complete.

Sections & marks

SectionTypeQuestionsMarks eachTotal
ASection Achoice515
BSection Bchoice11222
CSection Cchoice4312
Total2030

The question paper

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

Board Examination

Zoology

Kerala DHSE Plus Two Board 2026 · Set ANNUAL

Series/Set: ANNUALRoll No. ________
Time Allowed: 2 hoursMaximum Marks: 30

General Instructions

  1. This question paper contains 20 questions divided into 3 sections — A, B, C.
  2. Section A comprises 5 questions of 1 mark each (choice).
  3. Section B comprises 11 questions of 2 marks each (choice).
  4. Section C comprises 4 questions of 3 marks each (choice).

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

Section A

choice · 1 mark each · 5 of 5 shown

Q1.
Find the odd one out and state the reason. Bone marrow, Spleen, Lymph nodes, Tonsils
[1]
Q2.
Note the relationship between the first two words and find a suitable word for the fourth place. LNG - 20 : Hormone releasing IUD Multiload 375 : ________
[1]
Q3.
Symbols used in human pedigree analysis is given below. Identify these symbols used in pedigree chart.
[1]
Q4.
The milk produced during the initial few days of lactation is called ________.
[1]
Q5.
Expand HGP.
[1]
Page 1 of 4
Section B

choice · 2 marks each · 11 of 11 shown

Q1.
Answer the following questions: (a) All copulations do not lead to fertilization and pregnancy. Why? (b) After ovulation, the remaining part of the Graafian follicle transforms into a structure called ____.
[2]
Q2.
What is amniocentesis? Why is it banned in India?
[2]
Q3.
The amino acid sequences of the β (beta) globin chain of haemoglobin of two individuals are shown below: (i) Val - His - Leu - Thr - Pro - Glu - Glu (ii) Val - His - Leu - Thr - Pro - Val - Glu (a) Which one belongs to the haemoglobin of a sickle cell anaemic patient? (b) Give reason for your answer.
[2]
Q4.
T.H. Morgan selected Drosophila melanogaster as his experimental material. Mention two reasons for selecting Drosophila as an experimental material.
[2]
Q5.
(a) Complete the chart showing the hormonal control of spermatogenesis. (b) Which part of the sperm contains enzymes that help in the fertilization of ovum?
[2]
Q6.
Make pairs by matching the related items based on their source or relationship. Cyclosporin A, Monascus purpureus Statins Trichoderma polysporum
[2]
Q7.
Match the following: A | B Alec Jeffreys | The ratios between Adenine and Thymine and Guanine and Cytosine are constant and equal one James Watson and Francis Crick | Transforming Principle Erwin Chargaff | DNA Fingerprinting Frederic Griffith | Double Helix Model of DNA (no entry in column A) | Chromosomal theory of inheritance
[2]
Page 2 of 4
Q8.
Complete the chart showing the different barriers of innate immunity.
[2]
Q9.
Diagrammatic representation of an experiment is given below. (a) Who conducted this experiment? (b) What was the aim of this experiment?
[2]
Q10.
The pictures shown below are the beaks of certain birds found in an island during Darwin's journey. (a) Identify the birds and the island. (b) Which evolutionary phenomenon is represented in the picture?
[2]
Q11.
(a) Identify the diagram given below. (b) Label the parts X and Y.
[2]
Section C

choice · 3 marks each · 4 of 4 shown

Q1.
(a) Complete the table by filling A, B C (b) Write one symptom for each genetic disorder.
[3]
Q2.
Incidents of STIs are very high among the age group of 15-24 years. (a) What is meant by STI? (b) Name any two STIs. (c) Suggest any two preventive measures.
[3]
Q3.
Observe the following chart of the Evil Quartet of biodiversity loss: (a) Write A and B. (b) What are the two methods of biodiversity conservation? (c) Give one example each.
[3]
Page 3 of 4
Q4.
Genetic code is the sequence of nitrogen bases (nucleotides) in an mRNA molecule that contains information for the synthesis of proteins. (a) Which is the start codon? Which amino acid does it represent? (b) Write any two stop codons. (c) Genetic code is degenerated. Why?
[3]
Page 4 of 4