CUET 2026 Biology Most Expected Topics (High-Scoring Units & Important Questions)

Biology is one of the most important and high-scoring subjects in CUET 2026, especially for students aiming for life sciences, medicine, and related undergraduate courses. The exam is heavily based on NCERT concepts, and most questions are conceptual, diagram-based, or fact-oriented.

To score well, students must focus on CUET 2026 Biology most expected topics that are repeatedly asked from key units like Genetics, Reproduction, Biotechnology, Ecology, Evolution, and Human Health & Disease. Preparing these chapters strategically helps in better revision, faster question solving, and higher accuracy in MCQs.

CUET 2026 Biology Most Expected Topics

Given below are the CUET 2026 Biology Most Expected Topics that students should prepare thoroughly for the examination. These important topics are selected based on previous year question trends, NCERT concepts, and frequently asked chapters from Genetics, Reproduction, Biotechnology, Ecology, Evolution, and Human Health. 

Preparing these topics carefully can help students improve their conceptual understanding, perform better in MCQs, and score higher marks in the CUET 2026 Biology exam.

Sexual Reproduction in Flowering Plants

This chapter is very important for CUET Biology preparation. Questions are usually asked about plant reproduction processes, embryo development, and flower structure:

• Polyembryony

• Parthenocarpy

• False fruits

• Embryo sac

• Filiform apparatus

• Double fertilization

• Triple fusion

• Tapetum and pollen grain structure

• Two-celled pollen grain

Important Facts

• Filiform apparatus guides the pollen tube into the embryo sac.

• Primary Endosperm Nucleus is formed through triple fusion.

• Exine is made of sporopollenin.

• A flower is biologically a modified shoot.

Human Reproduction and Reproductive Health

This unit is highly important because direct factual questions are commonly asked.

• Menstrual cycle

• Fertilization and implantation

• Placenta and hormones

• Assisted Reproductive Technologies (ART)

• Contraceptive methods

• Vasectomy and Tubectomy

• Amniocentesis

Important Facts

• Menarche is the first menstruation.

• Ovulation usually occurs around the 14th day.

• Placenta produces hCG, hPL, estrogen, and progesterone.

• Saheli is a once-a-week oral contraceptive developed by CDRI.

Principles of Inheritance and Variation

Genetics is one of the most important sections in CUET Biology.

• Mendel’s laws

• Pedigree analysis

• Linkage and crossing over

• Chromosomal disorders

• Mendelian disorders

• Pleiotropy

• Morgan’s experiments

Important Disorders

• Down Syndrome

• Klinefelter Syndrome

• Hemophilia

• Sickle Cell Anemia

• Phenylketonuria

• Thalassemia

Important Facts

• Down Syndrome is Trisomy 21.

• Klinefelter Syndrome has XXY chromosomes.

• Phenylketonuria is an example of pleiotropy.

• Linkage caused deviation from Mendel’s dihybrid ratio in Morgan’s experiment.

Molecular Basis of Inheritance

This chapter is very important for conceptual and experimental questions.

• DNA and RNA structure

• Griffith’s experiment

• Hershey and Chase experiment

• Lac Operon

• Transcription and Translation

• DNA replication

• RNA processing

• Griffith’s Experiment Sequence

Important Facts

• DNA was labeled with P-32 in Hershey and Chase experiment.

• RNA can act as genetic material and catalyst.

• Ribosomes are involved in translation.

• Introns are removed by splicing.

Biotechnology and Its Applications

Biotechnology is one of the easiest scoring chapters in Biology.

• PCR

• Gel electrophoresis

• Bt Cotton

• Tissue culture

• Recombinant DNA technology

• Downstream processing

• Biopiracy

• Golden Rice

Important Facts

• Agarose gel is obtained from red algae.

• PCR steps are Denaturation, Annealing, and Extension.

• Bt toxin becomes active in the alkaline gut of insects.

• Golden Rice is rich in Vitamin A.

Important Scientists

• Stanley Cohen and Herbert Boyer developed the first recombinant DNA molecule.

• Hind II was the first isolated restriction enzyme.

Human Health and Disease

Questions from diseases, immunity, microbes, and drugs are commonly asked.

• Allergies

• Immune system

• Antibodies

• AIDS

• Cancer

• Typhoid

• Malaria

• Drug abuse

Important Facts

• IgE antibodies are responsible for allergies.

• ELISA test detects HIV infection.

• Widal test is used for typhoid diagnosis.

• Antibodies contain two heavy and two light chains.

Evolution

Evolution includes theoretical and evidence-based questions.

• Adaptive radiation

• Convergent evolution

• Homologous organs

• Analogous organs

• Fossils

• Mutation theory

• Industrial melanism

Important Facts

• Saltation theory was proposed by Hugo de Vries.

• Dryopithecus was more ape-like.

• Fossils provide paleontological evidence.

• Analogous organs result from convergent evolution.

Ecology and Environment

Ecology is very important because many assertion and statement questions are asked in this unit.

• Food chain and food web

• Ecological pyramids

• Population interactions

• Biodiversity

• Conservation

• Productivity

• Decomposition

Important Facts

• Energy flow is unidirectional.

• Tropical rainforests have the highest biodiversity.

• Insects form more than 70% of animal species.

• National parks are examples of in situ conservation.