Class 12 biology syllabus for CBSE board

Biology is the study of lifea scientific basis though. As the subject is vast, most challenging for those who aspire entrance exams especially AIPMT, NEET and other pre-medical entrance tests. The following section briefs the unit-wise, lesson-wise distribution of hours, marks and topics for each individual units. The total marks for the subject is 70 at the duration of 160 hours.

 

Examination scheme for Class 12 Biology Theory

Unit

Title

Marks

Number of Periods

VI

Reproduction

14

30

VII

Genetics and Evolution

18

40

VIII

Biology and Human Welfare

14

30

IX

Biotechnology and its Applications

10

30

X

Ecology and Environment

14

30

Total

70

160

 

 

 

Examination scheme for Class 12 Biology Practicals

Evaluation Scheme

Marks allotment

One Major Experiment from Part A (Experiment No- 1,3,7,8)

5 Marks

One Minor Experiment from  Part A (Experiment No- 6,9,10,11,12,13)

4 Marks

Slide Preparation Part A (Experiment No- 2,4,5)

5 Marks

Spotting Part B

7 Marks

Practical Record + Viva Voce

Credit to the students’ work over the
academic session may be given

4 Marks

Project Record + Viva Voce

5 Marks

Total

30 Marks

 

Unit-VI Reproduction

Chapter-1: Reproduction in Organisms
Reproduction, a characteristic feature of all organisms for continuation of species; modes of reproduction – asexual and 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 and oogenesis; menstrual cycle; fertilization, embryo development up to blastocyst formation, implantation; pregnancy and placenta formation (elementary idea); parturition (elementary idea); lactation (elementary idea).

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 (elementary idea for general awareness).

 

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 and honey bee; linkage and crossing over; sex linked inheritance – haemophilia, colour blindness; Mendelian disorders 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 genome projects; DNA fingerprinting.

Chapter-7: Evolution
Origin of life; biological evolution and evidences for biological evolution (paleontology, comparative anatomy, embryology and molecular evidences); 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 and Human Welfare

Chapter-8: Human Health and Diseases
Pathogens; parasites causing human diseases (malaria, dengue, chicken gunia, filariasis, ascariasis, typhoid, pneumonia, common cold, amoebiasis, ring worm) and their control; Basic concepts of immunology – vaccines; cancer, HIV and AIDS; Adolescence – drug and alcohol abuse.

Chapter-9: Strategies for Enhancement in Food Production
Improvement in food production: Plant breeding, tissue culture, single cell protein, Bio fortification, Apiculture and Animal husbandry.

Chapter-10: Microbes in Human Welfare
In household food processing, industrial production, sewage treatment, energy generation and microbes as bio-control agents and bio-fertilizers. Antibiotics; production and judicious use.

 

Unit-IX Biotechnology and Its Applications

Chapter-11: Biotechnology – Principles and processes
Genetic Engineering (Recombinant DNA Technology).

Chapter-12: Biotechnology and its Application
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 and Environment

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 (in brief).

Chapter-15: Biodiversity and its Conservation
Biodiversity-Concept, patterns, importance; loss of biodiversity; biodiversity conservation; hotspots, endangered organisms, extinction, 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 impact and mitigation; ozone layer depletion; deforestation; any one case study as success story addressing environmental issue(s).

 

Practical curriculum Part-A: List of Experiments

  1. Study pollen germination on a slide.

  2. Collect and study soil from at least two different sites and study them for texture, moisture content, pH and water holding capacity. Correlate with the kinds of plants found in them.

  3. Collect water from two different water bodies around you and study them for pH, clarity and presence of any living organism.

  4. Study the presence of suspended particulate matter in air at two widely different sites.

  5. Study the plant population density by quadrat method.

  6. Study the plant population frequency by quadrat method.

  7. Prepare a temporary mount of onion root tip to study mitosis.

  8. Study the effect of different temperatures and three different pH on the activity of salivary amylase on starch.

  9. Isolate DNA from available plant material such as spinach, green pea seeds, papaya, etc

 

 

B. Study/observation of the following (Spotting)

  1. Flowers adapted to pollination by different agencies (wind, insects, birds).

  2. Pollen germination on stigma through a permanent slide.

  3. Identification of stages of gamete development, i.e., T.S. of testis and T.S. of ovary through permanent slides (from grasshopper/mice).

  4. Meiosis in onion bud cell or grasshopper testis through permanent slides.

  5. T.S. of blastula through permanent slides (Mammalian).

  6. Mendelian inheritance using seeds of different color/sizes of any plant.

  7. Prepared pedigree charts of any one of the genetic traits such as rolling of tongue, blood groups, ear lobes, widow’s peak and color blindness.

  8. Controlled pollination – emasculation, tagging and bagging.

  9. Common disease-causing organisms like Ascaris, Entamoeba, Plasmodium, any fungus causing ringworm through permanent slides or specimens. Comment on symptoms of diseases that they cause

  10. Two plants and two animals (models/virtual images) found in xeric conditions. Comment upon their morphological adaptations.

  11. Two plants and two animals (models/virtual images) found in aquatic conditions. Comment upon their morphological adaptations.

 

Innoclazz Academy provides home tutors for all subjects and all boards. Book your free demo today to avail best home tutors in Bangalore, Chennai, Hyderabad, Pune and Mumbai.



img-1


img-1


img-1

Course List