CUET Biology Important Topics & Chapter Wise Weightage

CUET 2026 exam will be conducted at national level for admission to UG courses. Candidates preparing for CUET Biology must check CUET Biology important topics and chapter-wise weightage to ace the examination. Check the important subjects and question weightage for preparation.

CUET Biology Important Topics & Chapter Wise Weightage

CUET Biology Important Topics and Weightage: The National Testing Agency will be conducting the CUET exam for UG admissions across India at multiple exam centres. As per the CUET 2026 exam dates, the entrance test for all domain subjects, including Biology, will be held from May 11 to 31. Candidates aspiring for Biology related courses must select Biology as their domain subject. Such candidates must get an understanding of the CUET Biology important topics and chapter-wise weightage before they start the CUET preparation.

While preparing for CUET 2026 exam for Biology admission, candidates must focus on the important topics and chapter weightage. Read this article to know the CUET Biology important topics and chapter wise weightage for a top-notch preparation strategy.

CUET Biology Exam Pattern 2026

Before candidates start preparing, they must obtain a good understanding of the CUET exam pattern. CUET exam pattern remains the same, irrespective of the domain subject. Refer to the table below for more details on CUET UG exam pattern 2026.

CUET Biology Syllabus 2026

The space below mentions the CUET Biology syllabus for 2026-27 admission cycle:

Unit I: Reproduction 

1. Sexual Reproduction in Flowering Plants: Pre-fertilisation: structure and events - stamen, microsporangium and pollen grain, pistil, megasporangium and embryo sac; Development of male (microsporogenesis) and female gametophyte (megasporogenesis); Pollination – types, agents and examples; Out breeding devices; Pollen-pistil interaction; Double fertilisation; Post fertilisation: structure and events – development of endosperm and embryo; Formation of seed and fruit and parthenocarpy; Significance of seed in angiosperms; Apomixis and polyembryony.

2. Human Reproduction: Male and female reproductive systems; microscopic anatomy of testis and ovary; gametogenesis - spermatogenesis and oogenesis; menstrual cycle; fertilisation, embryo development up to blastocyst formation, implantation; pregnancy and embryoni development and placenta; Parturition and lactation.

3. Reproductive Health: Problems and strateies -  amniocentesis; Population stabilisation and birth control – various methods of contraception; Medical termination of pregnancy (MTP); Sexually transmitted infections (STIs); Infertility – Assisted reproductive technologies (IVF, ZIFT, GIFT, ICSI and IUI).

Unit II: Genetics and Evolution

1. Principles of Inheritance and Variation: Mendel’s law of inheritance: Inheritance of one gene – Law of dominance, law of segregation (test and back cross); Deviation from Mendelism – incomplete dominance and co-dominance; Multiple alleles and inheritance of blood groups; Inheritance of two genes – law of independent assortment, dihybrid cross; Chromosomal theory of inheritance; Linkage and recombination; Polygenic inheritance; Pleiotropy; Sex determination in humans, birds and honey bee; Mutation; Genetic disorders – pedigree analysis, Mendelian disorders (colour blindness, haemophilia, sickle-cell anaemia, phenylketonuria and thalassemia), chromosomal disorders in humans (aneuploidy, polyploidy, Down's syndrome, Turner's syndrome and Klinefelter's syndrome).

2. Molecular Basis of Inheritance:  Structure and packaging of DNA helix; Search for genetic material (transforming principle and Hershey-Chase experiment); Properties of genetic material; Replication (Meselson and Stahl’s experiment); Transcription – transcription unit and gene; RNA world – types of RNA and process of transcription; Genetic code and mutations; tRNA; Translation; Regulation of gene expression – Lac operon; Human Genome Project (goals, salient features and applications); DNA fingerprinting (polymorphism and VNTR). 

3. Evolution: Origin of life – Miller’s experiment; Concepts of evolution (Darwin's contribution); Evidences for evolution (embryology, paleontology, comparative anatomy, divergent and convergent evolution and industrial evolution); Adaptive radiation; Biological evolution; Natural selection; Mechanism of evolution; Hardy-Weinberg principle and affecting factors (gene migration, genetic drift, mutation, recombination and natural selection); Evolution of plants and vertebrates through geological periods; Origin and evolution of man.

Unit III: Biology and Human Welfare

1. Human Health and Disease: Introduction about health; Common diseases in humans (typhoid, pneumonia, common cold, malaria, amoebiasis, ascariasis, filariasis and ringworms); Immunity – innate and acquired immunity, active and passive immunity, vaccination and immunisation, allergies, auto-immunity and immune system in human; AIDS; Cancer; Drugs and alcohol abuse - adolescence, addiction, effects of drug abuse, prevention and control. 

2. Microbes in Human Welfare: Microbes in household products; Microbes in industrial products – beverages, antibiotics, enzymes and bioactive molecules; Microbes in sewage treatment and production of biogas, Microbes as biocontrol agents and biofertilisers. 

Unit IV: Biotechnology and its Applications 

1. Biotechnology: Principles and Processes: Principles of biotechnology; Tools of recombinant DNA technology – restriction enzymes, cloning vectors, competent host; Processes of rDNA technology – isolation, amplification of gene (PCR), insertion of rDNA in host and bioreactors; Downstream processing.

2. Biotechnology and its Applications: Application of biotechnology in agriculture – tissue
culture, genetically modified organisms, Bt cotton, RNA interference; Biotechnology in medicine – insulin, gene therapy and molecular diagnosis; Transgenic animals; Ethical issues – biopiracy and patents.

Unit V: Ecology and Environment 

1.  Organisms and Populations: Population attributes - birth and death rate, age pyramids; Population growth – exponential and logistic growth; Life history variation; Population interactions – predation, competition, parasitism, commensalism, mutualism and amensalism.

2. Ecosystem: Structure and function; Productivity; Decomposition; Energy flow – different trophic levels, food chain and food web; Ecological pyramids – pyramid of energy, biomass and number. 

3. Biodiversity and Conservation: Biodiversity – concept, patterns and importance; Causes of biodiversity loss; Biodiversity conservation – approaches (narrowly utilitarian, broadly utilitarian and ethical); Methods of biodiversity conservation – in situ (endemism, hotspots and sacred groves etc.), ex situ (Wildlife safaris, zoological parks and cryopreservation etc.).

Also Read: CUET Syllabus 2026

CUET Biology Important Topics

The table below mentions the unit wise important topics for CUET Biology exam:

CUET Biology Chapter Wise Weightage

Candidates can evaluate the CUET Biology chapter wise weightage after going through past exam analysis for the domain subject and question papers. The weightage for different chapter in CUET Biology paper can change each year. The table below mentions the expected chapter-wise weightage for CUET Biology exam as per the past trends:

Also Read: CUET Chapter Wise Weightage

CUET Domain Subjects: Syllabus and Question Paper

Candidates aspiring for CUET can download the CUET domain subject wise question paper and syllabus PDF for other subjects below:

CUET Biology Preparation Tips

During the CUET 2026 preparation for Biology domain subject, candidates can follow the preparation tips for holistic exam preparation:

• Analyse past papers to know the important topics that appear in CUET Biology question paper.
• Study using CBSE books to obtain foundational clarity of the topics.
• Practise previous year question papers. Candidates can also practise using mock tests: This will help candidates in improving their speed and accuracy.
• Make short notes for help in revision phase

Preparing for any competitive exam will also require clarity of the exam pattern. Candidates must analyse the past papers to understand test structure and syllabus.

CUET Biology Preparation Books

Students preparing for CUET Biology exam for admission to participating university/college by taking this subject as part of the combination can check below to some recommended books for CUET.

• NCERT Class 12 Biology Textbook 
• Pradeep’s A Text Book of Biology Class 12 by P.S. Dhami 
• Together with Biology by S. Chand
• Biology by Campbell and Reece 
• S. Chand’s Biology for class XII by B.P. Pandey 

Read More:

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• Difference between CUET syllabus and CBSE syllabus
• CUET Vs JEE Vs NEET