AIIMS Medical Entrance Exam Biology Syllabus 2025

Term I- Reproduction

1. Reproduction of Organisms: Reproduction is a habitual feature in all organisms for the continuance of species; Different ways of reproduction– Asexual and sexual; Asexual reproduction includes- binary fission, budding, vegetative propagation, spore formation (sporogenesis), fragmentation, parthenogenesis, and apomixis. Sexual reproduction includes syngamy and conjugation.

2. Sexual Reproduction in a Plant (Flowering): Structure of Flower; male and female gametophytes developments; types of pollination, agencies and examples; Outbreeding devices in plants; interaction of pollen-Pistil; double fertilization; post-fertilization events, endosperm and embryo development, seed development and formation of fruit; Special modes-apomixis (diplospory, apospory embryony, parthenocarpy, polyembryony; Importance of seed and fruit formation).

3. Reproduction in Humans: Male-female reproductive systems; testis and ovary (microscopic anatomy); Gametogenesis spermatogenesis and oogenesis; Menstruation and its cycle; Fertilisation, embryo maturation up to blastocyst stage, implantation; Pregnancy and formation of the placenta; Parturition; Lactation.

4. Reproductive Health: Importance of reproductive health and precaution against STD (sexually transmitted disease); need or methods birth control, Contraception and MTP (Medical Termination of Pregnancy); Amniocentesis; Infertility and reproduction assisting technologies – IV and ZIFT, etc.

Term II- Genetics and Evolution

1. Heredity and Variation: Mendelian Inheritance; Mendelism-Incomplete dominance deviations, Co-dominance, Multiple alleles and blood groups inheritance, pleiotropy; polygenic inheritance (elementary idea only); Chromosome theory of inheritance; Chromosomes and genes; Sex determination-In humans, birds and honey bee; Linkage and crossing over; Sex-linked inheritance-Haemophilia, Mendelian disorders in humans-Thalassemia; Chromosomal disorders; Down’s syndrome, Turner’s and Klinefelter’s syndromes, Colour blindness.

2. Molecular Basis of Inheritance: explore genetic material and DNA as genetic material; Structure of DNA and RNA; DNA packaging; DNA replication; Central dogma; Transcription, genetic code, translation; Gene expression and regulation-Lac Operon; Genome; DNA finger-printing.

3. Evolution: Life (Origin): Biological evolution and pieces of evidence for biological evolution from Paleontology, comparative anatomy, embryology and molecular evidence); contribution of Darwin, Modern Synthetic Theory of Evolution; Process of evolution-Variation (Mutation and Recombination) and Natural Selection, types of natural selection; Gene flow and genetic drift; Hardy-Weinberg’s principle; Adaptive Radiation; Human evolution.

Term III- Biology and Human Welfare

1. Health and Disease: Pathogens; parasites that cause human diseases such as (Malaria, Filariasis, Ascariasis Typhoid, Pneumonia, common cold, amoebiasis and ringworm); the Basic idea of immunology-vaccines; Cancer, HIV and AIDS; Adolescence, drug and alcohol abuse.

2. Development in Food Production: Plant breeding, tissue culture, single-cell protein, Biofortification; Apiculture and Animal husbandry.

3. Microbes Concerning Human Welfare: household food processing, industrial production, sewage treatment, energy generation.

Term IV- Biotechnology and Its Application

1. Concept of Biotechnology and Its Process: Genetic engineering (Recombinant DNA technology).

2. Implementation of Biotechnology in Healthcare and Agriculture Development: Human insulin and vaccine production, gene therapy and genetically modified organisms like Bt crops; Transgenic Animals; Biosafety issues such as Biopiracy and patents.

Term V- Ecology and Environment

1. Organisms and environment: Organisms and Populations(Habitat and Niche) Pollution; Abiotic Factors (erythema, stenothermal, euryhaline, stenohaline, photoperiodism); Global  Warming and its effects; Deforestation. Pollutions (Attributes and density); Pollution growth, Growth models (exponential growth and Logistic Growth; Population Interaction.

Let us Look Below the Exam Pattern.

1. The paper was taken on an online computer-based setting. 

2. The total time allotted for the paper was 3 hours and 30 minutes.

3. The exam was taken in two shifts: 

1. Shift 1 (9:00 AM to 12:30 PM)

2. Shift 2 (3:00 PM to 6:30 PM)

4. The languages in which the paper was taken were English and Hindi. 

5. The examination was an objective type examination. 

6. The examination contained the questions in the form of MCQs.

7. There were 200 MCQs in total. 

8. The marking scheme was as follows: 

1. 1 mark for every right question 

2. And one-third Mark deducted for every wrong one.

Biology Questions and Solutions-PDF

Biology is derived from the Greek word bios ( meaning life)and logos (means study). Biology is a tough nut to crack in the AIIMS exam. But with help of Vedantu question paper and solution students can really score well

AIIMS Eligibility Requirements :

Age Requirements - Students must be at least 17 years old.

Biology, physics, and chemistry should be included in the qualifying examination for subject candidates.