CBSE Class 12 Biology Board Exam 2020: Most Important Topics
CBSE Class 12 Biology board exam 2020 is scheduled for 14th March 2020. In this article, you will get complete list of topics which are expected to be asked in Class 12 Biology board exam 2020.
Learn about important topics from which questions can be asked in CBSE Class 12 Biology Board Exam 2020. As, per CBSE Date Sheet 2020, Class 12 Biology paper is scheduled to be held on 14th March 2020. The subject has huge syllabus & now students should focus on revision.
Here, we have pointed out some important topics from the complete syllabus. There is a huge probability that questions based on these concepts will be asked in CBSE Class 12 Biology board exam 2020. Students preparing for this exam are also advised to go through latest CBSE Class 12 Biology Sample Paper. This paper is recently issued by CBSE. With this Sample Paper, students can easily understand latest blueprint and examination pattern of CBSE Class 12 Biology board exam.
Complete details related to important topics from which questions which can be asked in CBSE Class 12 Biology board exam 2020 are given below:
Unit VI Reproduction
Chapter 1: Reproduction in Organisms
| Modes of reproduction - asexual reproduction & sexual reproduction |
| Asexual reproduction – binary fission, sporulation budding, gemmule formation, fragmentation, vegetative propagation in plants |
Chapter 2: Sexual Reproduction in Flowering Plants
| Flower structure |
| Development of male and female gametophytes |
| Pollination-types, agencies and examples |
| Outbreeding devices |
| Pollen-pistil interaction |
| Double fertilization |
| Post fertilization events-development of endosperm and embryo |
| Development of seed and formation of fruit |
| Special modes-apomixis, parthenocarpy, polyembryony |
| Significance of seed dispersal and fruit formation |
Chapter 3: Human Reproduction
| Male and female reproductive systems |
| Microscopic anatomy of testis and ovary |
| Gametogenesis-spermatogenesis & oogenesis |
| Menstrual cycle: fertilization, embryo development upto blastocyst formation, implantation |
| Pregnancy and placenta formation |
| Parturition |
| Lactation |
Chapter 4: Reproductive Health
| Need for reproductive health and prevention of sexually transmitted diseases (STDs) |
| Birth control – need and methods |
| Contraception and medical termination of pregnancy (MTP) |
| Amniocentesis |
| Infertility and assisted reproductive technologies - IVF, ZIFT, GIFT |
Unit VII Genetics and Evolution
Chapter 5: Principles of Inheritance and Variation
| Heredity and Variation: Mendelian inheritance |
| Deviations from mendelism - incomplete dominance, co-dominance, multiple alleles and inheritance of blood groups, pleiotropy |
| Elementary idea of polygenic inheritance |
| Chromosome theory of inheritance |
| Chromosomes and genes |
| Sex determination - in humans, birds, honey bee |
| Linkage and crossing over |
| Sex linked inheritance - haemophilia, colour blindness |
| Mendelian disorder in humans - thalassemia |
| Chromosomal disorders in humans |
| Down's syndrome, Turner's and Klinefelter's syndromes. |
Chapter 6: Molecular Basis of Inheritance
| Search for 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 and human and rice ganeome project |
| DNA fingerprinting |
Chapter 7: Evolution
| Biological evolution and evidences for biological evolution (paleontological, comparative anatomy, embryology and molecular evidence) |
| Darwin's contribution |
| Modern synthetic theory of evolution |
| Mechanism of evolution - variation (mutation and recombination) and natural selection with examples |
| Types of natural selection |
| Gene flow and genetic drift |
| Hardy - Weinberg's principle |
| Adaptive Radiation |
| Human evolution |
Unit VIII Biology in Human Welfare
Chapter 8: Human Health and Disease
| Pathogens: parasites causing human diseases and their control |
| Basic concepts of immunology - vaccines: cancer, HIV and AIDs |
| Adolescene |
| Drug and alcohol abuse |
Chapter 9: Strategies for Enhancement in Food Production
| Improvement in food production |
| Plant breeding |
| Tissue culture |
| Single cell protein |
| Biofortification |
| Apiculature and Animal husbandry |
Chapter 10: Microbes in Human Welfare
| Household food processing |
| Industrial production |
| Sewage treatment |
| Energy generation and microbes as biocontrol agents and biofertilizers |
| Antibiotics - production and judicious use |
Unit IX Biotechnology
Chapter 11: Biotechnology: Principles and Processes
| Genetic engineering (Recombinant DNA technology). |
Chapter 12: Biotechnology and its Applications
| Application of biotechnology in health and agriculture |
| Human insulin and vaccine production |
| Stem cell technology |
| Gene therapy |
| Genetically modified organisms - Bt crops; transgenic Animals; biosafety issues, bio piracy and patents |
Unit X Ecology
Chapter 13: Organisms and Populations
| Organisms and environment |
| Habitat and niche |
| Population and ecological adaptations |
| Population interactions-mutualism, competition, predation, parasitism |
| Population attributes - growth, birth rate and death rate, age distribution |
Chapter 14: Ecosystem
| Ecosystems: Patterns, components |
| Productivity and decomposition |
| Energy flow; pyramids of number, biomass, energy |
| Nutrient cycles (carbon and phosphorous) |
| Ecological succession |
| Ecological services - carbon fixation, pollination, seed dispersal, oxygen release |
Chapter 15: Biodiversity and Conservation
| Concept of biodiversity |
| Patterns of biodiversity |
| Biodiversity conservation |
| Hotspots |
| Endangered organisms |
| Red Data Book |
| Biosphere reserves, national parks, sanctuaries and Ramsar sites |
Chapter 16: Environmental Issues
| Air pollution and its control |
| Water pollution and its control |
| Agrochemicals and their effects |
| Solid waste management |
| Radioactive waste management |
| Greenhouse effect and climate change |
| Ozone layer depletion |