What is the total mark distribution for the Karnataka 2nd PUC Biology exam 2026?

The Karnataka 2nd PUC Biology exam is conducted for 70 marks in the theory paper and 30 marks in the practical examination. The total marks for the subject are 100, and students must pass both theory and practical papers separately to pass overall.

How long is the Karnataka 2nd PUC Biology exam?

The theory exam is held for 3 hours and 15 minutes. Students must attempt questions from all parts within this time frame.

Which units carry the highest weightage in the Biology syllabus?

Units like Genetics & Evolution (including Principles of Inheritance and Molecular Basis of Inheritance) carry the highest marks, followed by important concepts in Human Health & Disease and Reproduction. These topics are crucial for scoring well.

How is the question paper structured?

The Biology theory paper is divided into four parts (Part A, B, C, and D):Part A: Very short questions (1 mark each)Part B: Short questions (2 marks each)Part C: Slightly longer questions (3 marks each)Part D: Long descriptive questions (5 marks each)

Why should I focus on chapter-wise weightage when studying?

Chapter-wise weightage tells you which topics contribute more marks, helping you plan revision and practice more effectively. Focusing on high-weightage chapters increases your chances of scoring higher overall.

Karnataka 2nd PUC Biology Weightage 2026 - Check subject wise weightage

Each chapters and topics in Karnataka 2nd PUC Biology exam has different weightage. Knowing about the weightage helps students prioritise topics accordingly. Check here Karnataka 2nd PUC Biology Weightage 2026!

Table of Contents

Karnataka 2nd PUC Biology Exam Pattern 2026
Karnataka 2nd PUC Biology Chapter-Wise Weightage 2026
Karnataka 2nd PUC Biology Weightage 2026: Important Topics from Each Chapter
Karnataka 2nd PUC Biology 2026: Types and Number of Questions from Each Chapter
How to Score High Using Karnataka 2nd PUC Biology Weightage 2026

The Karnataka School Examination and Assessment Board (KSEAB) Class 12 (Karnataka 2nd PUC) Biology exam 2026 is scheduled in a few days. The exam is conducted for 70 marks and lasts for 3 hours. There will be 30 marks practical examination. Students must pass both the theory and practical papers to pass the overall biology exam. Students must be thorough with the exam pattern, type of questions, and chapter-wise weightage before the exam.

The theory paper is 70 marks. The question paper is divided into several parts, including a variety of questions like objective-type questions, short-answer questions, and long-answer questions. Not only this, but the practical paper of 30 marks also plays an important role in scoring well in the paper.

The units in the biology syllabus include Reproduction, Genetics & Evolution, Biology and Human Welfare, Biotechnology and Its Applications, and Ecology and Environment. Among these, units like Genetics & Evolution and Molecular Basis of Inheritance carry relatively higher weightage, and so students must give priority to these subjects in their preparation.

The question paper is divided into four parts: Part A has 20 questions worth 1 mark each, Part B contains 7 questions of 2 marks each, Part C includes 7 questions of 3 marks each, and Part D consists of 10 questions worth 5 marks each.

Knowing the weightage and pattern of the Biology exam helps students plan their study schedule, focus on high-scoring chapters, and improve both accuracy and time management in the actual board examination.

Also read: Karnataka 2nd PUC Biology exam pattern 2026

Karnataka 2nd PUC Biology Exam Pattern 2026

The Karnataka 2nd PUC Biology exam 2026 is a theory-based paper of 70 marks conducted for Class 12 Science students. The exam is held for 3 hours and 15 minutes. The question paper is in four parts, Part A, B, C, and D, covering very short, short, and long-answer questions.

Part A: This section has 20 questions, each to be answered in one word or one sentence. All the questions carry 1 mark each and a total of 10 marks in this unit. So, 20 marks from this unit.
Part B: In this part, there are 7 questions an each question carries 2 marks. Students must answer any 5 questions from 7, so making it 10 marks from this section.
Part C: This part consists of 7 questions, and each question carries 3 marks. Students need to answer any 5 questions from this part, so it is 15 marks from this part.
Part D: In the last part, there will be 10 questions and 5 marks for each question. Out of 10, students must answer any 5. So, a total of 25 marks from this part.

In total, there are 44 questions in the paper, and students are required to answer any 35 questions. All questions are usually compulsory.

Also read: Karnataka 2nd PUC Biology Syllabus 2026

Karnataka 2nd PUC Biology Chapter-Wise Weightage 2026

Below is the chapter-wise marks distribution in the Karnataka 2nd PUC Biology paper. Candidates can check this and make their study schedule accordingly.

Chapter Number	Chapter Name	Marks Allotted
1	Sexual reproduction in flowering plants	12
2	Human reproduction	11
3	Reproductive Health	7
4	Principles of Inheritance and Variation	15
5	Molecular Basis of Inheritance	15
6	Evolution	8
7	Human health and diseases	13
8	Microbes in Human Welfare	8
9	Biotechnology – Principles and Processes	8
10	Biotechnology and its applications	7
11	Organism and populations	6
12	Ecosystem	5
13	Biodiversity and Its Conservation	5

Among all the 13 chapters, the top 5 most important chapters carrying the highest qeightage includes:

Principles of Inheritance and Variation: Carries 15 marks
Molecular basis of Inheritance: Carries 15 marks
Human health and diseases: Carries 13 marks
Sexual reproduction in flowering plants: Carries 12 marks
Human reproduction: Carries 11 marks

Students must prioritise these 5 topics to score well in the biology paper.

Also read: Karnataka 2nd PUC sample papers 2026

Karnataka 2nd PUC Biology Weightage 2026: Important Topics from Each Chapter

Candidates can check out the important topics from each chapter below. This will help the students to practise questions from these portions.

Chapter Name	Important Topics
Sexual reproduction in flowering plants	Apomixis, parthenocarpy, polyembryony Flower structure, male and female gametophyte development Outbreeding devices Pollen-pistil interaction, doublfertilisationoPost-fertilisationon events: endosperm, embryo, seed and fruit formation Significance of seed dispersal and fruit formation Types and agents of pollination
Human reproduction	Embryo development to the blastocyst stage Gametogenesis: spermatogenesis, oogenesis Implantation, pregnancy, placenta formation Male and female reproductive systems Menstrual cyclefertilisationon Microscopic structure of the testis and ovary Parturition and lactation (elementary ideas)
Reproductive Health	Birth control methods and their significance Importance of reproductive health Infertility and assisted reproductive technologies (IVF, ZIFT, GIFT) – basic awareness Medical Termination of Pregnancy (MTP), amniocentesis Prevention of STDs
Principles of Inheritance and Variation	Chromosomal disorders: Down's, Turner's, Klinefelter's syndrome Chromosome theory of inheritance Mendelian inheritance and deviations (incomplete dominance, codominance, multiple alleles, blood groups) Pleiotropy and polygenic inheritance Heredity and variation
Molecular Basis of Inheritance	DNA and RNA structure DNA as genetic material DNA packaging, replication, central dogma Gene expression, regulation (lac operon) Genome projects, DNA fingerprinting Transcription, genetic code, translation
Evolution	Adaptive radiation, human evolution Darwin’s theory, Modern Synthetic Theory Evidence: palaeontology, anatomy, embryology, molecular Gene flow, genetic drift, Hardy-Weinberg principle Origin of life and biological evolution Types of natural selection Variation (mutation and recombination), natural selection
Human health and diseases	Alcohol and drug abuse in adolescence Cancer, HIV/AIDS, vaccination Disease prevention and control methods Immunology basics
Microbes in Human Welfare	Antibiotics: production and responsible usage Microbes in food processing, industry, sewage treatment, and energy production Roles as biocontrol agents and biofertilizers
Biotechnology – Principles and Processes	Principles of genetic modification principles Recombinant DNA technology
Biotechnology and its applications	Applications in health and agriculture Biosafety, biopiracy, biopatents Gene therapy, GMOs (Bt crops, transgenic animals) Human insulin, vaccine production, and stem cell research
Organism and populations	Habitat and niche concepts Ecological adaptations Population growth, mortality, and age distribution Population interactions: parasitism, predation, competition, mutualism
Ecosystem	Ecosystem structure and components Productivity and decomposition Energy flow and ecological pyramids Types of ecological pyramids Population biology
Biodiversity and Its Conservation	Biodiversity hotspots Biodiversity loss and conservation strategies Biosphere reserves, national parks, sanctuaries, Ramsar sites Endangered species, extinction Red Data Book

Karnataka 2nd PUC Biology 2026: Types and Number of Questions from Each Chapter

Candidates who are appearing for the Karnataka 2nd PUC Biology examination can check the total number of questions from each chapter below:

Chapter Name	Part A (1 mark question)	Part B (2 mark question)	Part C (3 mark question)	Part D (5 mark question)	Total Questions
Sexual reproduction in flowering plants	1	1	1	1	4
Human reproduction	2	-	1	1	4
Reproductive Health	1	1	1	-	3
Principles of Inheritance and Variation	1	1	-	2	4
Molecular Basis of Inheritance	1	1	-	2	4
Evolution	2	1	1	-	4
Human health and diseases	3	-	1	1	5
Microbes in Human Welfare	2	1	1	-	4
Biotechnology – Principles and Processes	2	-	-	1	3
Biotechnology and its applications	1	-	-	1	2
Organism and populations	1	-	-	1	2
Ecosystem	1	-	1	-	2
Biodiversity and Its Conservation	2	1	-	-	3

Also read: Karnataka 2nd PUC Biology previous year question paper

How to Score High Using Karnataka 2nd PUC Biology Weightage 2026

Candidates can checkout few important tips mentioned below to score high using the Karnataka 2nd PUC Biology weightage 2026:

Students must first start their preparation with important topics like Principles of Inheritance & Variation and Molecular Basis of Inheritance. These chapters usually carry the highest marks in the question paper.
Prior to starting to prepare, students must be thorough with the detailed syllabus, how many marks each part carries and practise accordingly.
Students must make concise revision notes. You can write short notes for key concepts, definitions, and processes. These help you revise quickly before the exam and remember important points easily.
Students must not forget to practice diagrams regularly. In biology, labelled diagrams are often asked in the exam.
You must solve previous papers and sample papers. This will help you to understand question formats and improve your time management during the actual exam.

The above-mentioned chapter-wise marks distribution will help students to know the high-weightage chapters and help them prioritise those topics that frequently come in the exam. Students must plan their schedule accordingly and must also practise the previous year's question papers and sample papers to know the question type and how to frame the answers to score high in the paper.