Deleted Portion of CBSE Class 11 and 12 - Physics, Chemistry, Math, Biology [2020-21]

Deleted Portion of CBSE Class 11 and 12.

Last Updated : October 10, 2020.

Latest News : As per the TOI and CBSE officials, CBSE and ICSE are considering more reduction in syllabus for Boards as the pandemic continues to disrupt academic activities. The Board exams may be postponed by 45-60 days, shifted to April to complete the syllabus.

CBSE has reduced the syllabus for 2020-21 session by almost 30% for the convenience of students who have not been able to attend regular classes due to COVID-19 pandemic. Here we will see the deleted portion of CBSE Class 11 and 12 for Physics, Chemistry, Math and Biology subjects. Students who are in grade 11 and 12 (in the 2020-21 session) are not required to study the below removed topics and chapters.

Deleted Portion of CBSE Class 11 and 12 Syllabus

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Deleted Portion of CBSE Class 11 Physics

Given below are the deleted topics from CBSE Class 11 Physics.

Chapter Name Removed Topics
Chapter–1: Physical World Physics-scope and excitement; nature of physical laws; Physics, technology and society (To be discussed as a part of Introduction and integrated with other topics)
Chapter-3 : Motion in a straight line Frame of reference, Motion in a straight line: Position-time graph, speed and velocity
Chapter-5 Laws of Motion Intuitive concept of force, Inertia, Newton's first law of motion; momentum and Newton's second law of motion; impulse; Newton's third law of motion
Chapter-7 System of Particles and Rotational Motion Statement of parallel and perpendicular axes theorems and their applications.
Chapter-8 Gravitation Kepler's laws of planetary motion, Acceleration due to gravity
Chapter-9 Mechanical Properties of Solids Elastic behaviour, shear modulus of rigidity, Poisson's ratio; elastic energy.
Chapter-11 Thermal properties matter Heat, temperature, Heat transfer-conduction, convection and radiation.
Chapter-12 Thermodynamics Heat engine and refrigerator.
Chapter-15 Waves Fundamental mode and harmonics, Doppler effect.
Practicals: No investigatory project and Activity to be demonstrated 8 experiments (clubbed based on skills) in place of 12

Deleted Portion of CBSE Class 11 Chemistry

Given below are the deleted topics from CBSE Class 11 Chemistry.

S No Unit Name Removed Topics
1 Some Basic Concepts of Chemistry Nature of matter, laws of chemical combination, Dalton's atomic theory: concept of elements, atoms and molecules.
2 Structure of Atom Discovery of Electron, Proton and Neutron, atomic number, isotopes and isobars. Thomson's model and its limitations. Rutherford's model and its limitations.
3 Classification of Elements and Periodicity in Properties Significance of classification, brief history of the development of periodic table.
4 Chemical Bonding and Molecular Structure No topics removed.
5 States of Matter: Gases and Liquids Liquefaction of gases, critical temperature, kinetic energy and molecular speeds (elementary idea), Liquid State- vapour pressure, viscosity and surface tension (qualitative idea only, no mathematical derivations)
6 Chemical Thermodynamics Heat capacity and specific heat capacity, Criteria for equilibrium
7 Equilibrium Hydrolysis of salts (elementary idea), Henderson Equation
8 Redox Reactions Applications of redox reactions
9 Hydrogen Preparation, properties and uses of hydrogen, hydrogen peroxide - preparation, reactionsand structure and use.
10 s Block Elements Preparation and Properties of Some Important Compounds: Sodium Carbonate, Sodium Chloride, Sodium Hydroxide and Sodium Hydrogen carbonate, Biological importance of Sodium and Potassium. Calcium Oxide and Calcium Carbonate and their industrial uses, biological importance of Magnesium and Calcium.
11 Some p Block Elements Some important compounds: Borax, Boric acid, Boron Hydrides, Aluminium: Reactions with acids and alkalies, uses. Carbon: uses of some important compounds: oxides. Important compounds of Silicon and a few uses: Silicon Tetrachloride, Silicones, Silicates and Zeolites, their uses.
12 Organic Chemistry: Some basic Principles and Techniques Methods of purification, qualitative and quantitative analysis.
13 Hydrocarbons Free radical mechanism of halogenation, combustion and pyrolysis.
14 Environmental Chemistry Entire chapter is removed.

Deleted Portion From Class 11 Chemistry Practical

C. Experiments based onpH

a) Any one of the following experiments: Determination of pH of some solutions obtained from fruit juices, solution of known and varied concentrations of acids, bases and salts using pH paper or universal indicator.
Comparing the pH of solutions of strong and weak acids of same concentration.
Study the pH change in the titration of a strong base using universal indicator.

b) Study the pH change by common-ion in case of weak acids and weak bases.

D. Chemical Equilibrium

One of the following experiments:
a) Study the shift in equilibrium between ferric ions and thiocyanate ions by increasing/decreasing the concentration of either of theions.
b) Study the shift in equilibrium between [Co(H2O)6]2+ and chloride ions by changing the concentration of either of theions.

Deleted Portion of CBSE Class 11 Math

Given below are the deleted topics from CBSE Class 11 Math.

Chapter/ Unit Name Removed Topics
Unit- I: Sets and Functions
1. Sets Difference of sets. Complement of a set. Properties of Complement.
2. Relations & Functions (up to RXRXR ). Sum, Difference, product and quotients of functions.
3. Trigonometric Functions General Solutions of trigonometric equations of the type siny=sina, cosy=cosa and tany= tana.
Unit II: Algebra
1. Principle of Mathematical Induction Entire chapter is removed.
2. Complex Numbers and Quadratic Equations Polar representation of complex numbers. Square root of a complex number.
3. Linear Inequalities No topic is removed.
4. Permutations and Combinations Derivation of formulae for nPr and nCr
5. Binomial theorem Entire chapter is removed
6. Sequence and Series Formulae for the following special sums ∑𝑘, ∑k2, ∑k3
Unit III: Coordinate geometry
1. Straight Lines Shifting of origin. Equation of family of lines passing through the point of intersection of two lines.
2. Conic section A point, a straight line and a pair of intersecting lines as a degenerated case of a conic section.
3. Introduction to Three-dimensional Geometry No topic is removed
Unit-IV : Calculus
1. Limits and Derivatives No topic is removed
Unit-V : Mathematical Reasoning
1. Mathematical Reasoning Entire chapter is removed
Unit-VI: Statistics and Probability
1. Statistics Analysis of frequency distributions with equal means but different variances.
2. Probability Axiomatic (set theoretic) probability, connections with other theories of earlier classes

Deleted Portion of CBSE Class 11 Biology

Given below are the deleted topics from CBSE Class 11 Biology.

Chapter/ Unit Name Removed Topics
Unit 1: Diversity of Living Organisms
Chapter-1: The Living World Taxonomy and systematics; Tools for study of taxonomy- museums, zoological parks, herbaria, botanical gardens, keys for identification.
Chapter-3: Plant Kingdom Angiospermae; Angiosperms - classification up to class, characteristic features and examples.
Unit-II Structural Organization in Animals and Plants
Chapter-5: Morphology of Flowering Plants Morphology and modifications: Morphology of different parts of flowering plants: root, stem, leaf, fruit and seed. Description of families: - Fabaceae
Chapter-6: Anatomy of Flowering Plants Anatomy and functions of different tissues and tissue systems in dicots and monocots. Secondary growth.
Chapter-7: Structural Organisation in Animals Morphology, Anatomy and functions of different systems (digestive, circulatory, respiratory, nervous and reproductive) of an insect (cockroach), (a brief account only).
Unit-IV Plant Physiology
Chapter-11: Transport in Plants Movement of water, gases and nutrients; cell to cell transport, diffusion, facilitated diffusion, active transport; plant-water relations, imbibition, water potential, osmosis, plasmolysis; long distance transport of water - Absorption, apoplast, symplast, transpiration pull, root pressure and guttation; transpiration, opening and closing of stomata; Uptake and translocation of mineral nutrients - Transport of food, phloem transport, mass flow hypothesis.
Chapter-12: Mineral Nutrition Essential minerals, macro- and micronutrients and their role; deficiency symptoms; mineral toxicity; elementary idea of hydroponics as a method to study mineral nutrition; nitrogen metabolism, nitrogen cycle, biological nitrogen fixation.
Unit-V Human Physiology
Chapter-16: Digestion and Absorption Alimentary canal and digestive glands, role of digestive enzymes and gastrointestinal hormones; Peristalsis, digestion, absorption and assimilation of proteins, carbohydrates and fats; calorific values of proteins, carbohydrates and fats; egestion; nutritional and digestive disorders - PEM, indigestion, constipation, vomiting, jaundice, diarrhoea.
Chapter-20: Locomotion and Movement Types of movement - ciliary, flagellar, muscular; Skeletal system and its functions; joints; disorders of muscular and skeletal systems - myasthenia gravis, tetany, muscular dystrophy, arthritis, osteoporosis, gout.
Chapter-21: Neural Control and Coordination Reflex action; sensory perception; sense organs; elementary structure and functions of eye and ear.

Deleted Portion From Class 11 Biology Practical

A: List of Experiments

  • Description of Family Fabaceae; Types of root (Tap and adventitious); types of stem (herbaceous and woody); leaf(arrangement, shape, venation, simple and compound).
  • Preparation and study of T.S. of dicot and monocot roots and stems (primary).
  • Study of osmosis by potato osmometer.
  • Study of plasmolysis in epidermal peels (e.g. Rhoeo/lily leaves or flashy scale leaves of onion bulb).
  • Comparative study of the rates of transpiration in the upper and lower surface of leaves.
  • Test for the presence of sugar, starch, proteins and fats in suitable plant and animal materials.
  • Test for presence of urea in urine.
  • Test for presence of bile salts in urine.

B. Study/Observation of the following (spotting)

  • Tissues and diversity in shape and size of plant cells (palisade cells, guard cells, parenchyma, collenchyma, sclerenchyma, xylem and phloem) throughtemporary and permanent slides.
  • Different modifications in roots, stems and leaves.
  • Different types of inflorescence (cymose and racemose).
  • Human skeleton and different types of joints with the help of virtual images/models only.

Deleted Portion of CBSE Class 12 Physics

Given below are the deleted topics from CBSE Class 12 Physics.

Chapter Name Removed Topics
Chapter-1 Electric charges and fields Uniformly charged thin spherical shell (field inside and outside).
Chapter-3 Current Electricity Carbon resistors, colour code for carbon resistors; series and parallel combinations of resistors.
Chapter-4 Moving Charges and Magnetism Cyclotron.
Chapter-5 Magnetism and Matter Magnetic field intensity due to a magnetic dipole (bar magnet) along its axis and perpendicular to its axis, torque on a magnetic dipole (bar magnet) in a uniform magnetic field; Para-, dia- and ferro - magnetic substances, with examples. Electromagnets and factors affecting their strengths, permanent magnets.
Chapter-7 Alternating Current Power factor, wattless current.
Chapter 8 Electromagnetic Waves Basic idea of displacement current.
Chapter 9 Ray Optics and Optical Instruments Reflection of light, spherical mirrors,(recapitulation) mirror formula, Scattering of light - blue colour of sky and reddish appearance of the sun at sunrise and sunset. Resolving power of microscope and astronomical telescope, polarisation, plane polarised light, Brewster's law, uses of plane polarised light and Polaroids.
Chapter-11 Dual Nature of radiation and matter Davisson-Germer experiment
Chapter 13 Nuclei Radioactivity, alpha, beta and gamma particles/rays and their properties; radioactive decay law, half life and mean life binding energy per nucleon and its variation with mass number.
Chapter 14 Semiconductor Electronics: Materials, Devices and Simple Circuits Zener diode and their characteristics, zener diode as a voltage regulator.
Practicals: No investigatory project and Activity to be demonstrated 8 experiments (clubbed based on skills) in place of 12

Deleted Portion of CBSE Class 12 Chemistry

Given below are the deleted topics from CBSE Class 12 Chemistry.

S No Unit Name Removed Topics
1 Solid State Electrical and magnetic properties. Band theory of metals, conductors, semiconductors and insulators and n and p type semi conductors.
2 Solutions Abnormal molecular mass, Van't Hoff factor.
3 Electrochemistry Lead accumulator, fuel cells, corrosion, law of electrolysis (elementary idea), dry cell- electrolytic cells and Galvaniccells.
4 Chemical Kinetics Concept of collision theory (elementary idea, no mathematical treatment), activation energy, Arrhenius equation.
5 Surface Chemistry Emulsion - types of emulsions, catalysis: homogenous and heterogeneous, activity and selectivity of solid catalysts; enzyme catalysis.
6 General Principles and Processes of Isolation of Elements Entire unit is removed.
7 p-Block Elements Preparation and properties of Phosphine, Sulphuric Acid: industrial process of manufacture, Oxides of Nitrogen (Structure only); Phosphorus - allotropic forms, compounds of Phosphorus: Preparation and properties of Halides and Oxo acids (elementary idea only).
8 d and f Block Elements Chemical reactivity of lanthanoids, Actinoids -Electronic configuration, oxidation states and comparison with lanthanoids. Preparation and properties of KMnO4 and K2Cr2O7
9 Coordination Compounds Structure and stereoisomerism, importance of coordination compounds (in qualitative analysis, extraction of metals and biological system).
10 Haloalkanes and Haloarenes Uses and environmental effects of -dichloromethane, trichloromethane, tetrachloromethane, iodoform, freons, DDT.
11 Alcohols, Phenols and Ethers Uses with special reference to methanol and ethanol.
12 Aldehydes, Ketones and Carboxylic Acid No topic removed.
13 Amines Diazonium salts: Preparation, chemical reactions and importance in synthetic organic chemistry.
14 Biomolecules Oligosaccharides (sucrose, lactose, maltose), polysaccharides (starch, cellulose, glycogen), importance of carbohydrates. Vitamins– classification and functions. Enzymes. Hormones - Elementary idea excluding structure.
15 Polymers Entire chapter is removed.
16 Chemistryin Everydaylife Entire chapter is removed.

Deleted Portion From Class 12 Chemistry Practical

A. Surface Chemistry

a. Preparation of one lyophilic and one lyophobic sol Lyophilic sol - starch, egg albumin and gum Lyophobic sol - aluminium hydroxide, ferric hydroxide, arsenous sulphide.
Dialysis of sol-prepared in (a)above.
Study of the role of emulsifying agents in stabilizing the emulsion of different oils.

B. Chemical Kinetics

a. Effect of concentration and temperature on the rate of reaction between Sodium Thiosulphate and Hydrochloric acid.
b. Study of reaction rates of any one of the following:
i) Reaction of Iodide ion with Hydrogen Peroxide at room temperature using different concentration of Iodideions.
ii) Reaction between Potassium Iodate, (KIO3) and Sodium Sulphite: (Na2SO3)using starch solution as indicator (clock reaction).

C. Thermo chemistry Any one of the following experiments

i) Enthalpy of dissolution of Copper Sulphate or Potassium Nitrate.
ii) Enthalpy of neutralization of strong acid (HCI) and strong base(NaOH).
Determination of enthaply change during interaction (Hydrogen bond formation) between Acetone and Chloroform.

D. Electrochemistry Variation of cell potential in Zn/Zn 2+|| Cu2+/Cu with change in concentration of electrolytes (CuSO4 or ZnSO4) at room temperature.

G. Preparation of Organic Compounds Preparation of any one of the following compounds

i) Acetanilide
ii) Di-benzal Acetone
iii) p-Nitroacetanilide

Aniline yellow or 2 - Naphthol Anilinedye

Deleted Portion of CBSE Class 12 Math

Given below are the deleted topics from CBSE Class 12 Math.

Chapter/ Unit Name Removed Topics
Unit 1: Relations and Functions
1. Relations and Functions Composite functions, inverse of a function.
2. Inverse Trigonometric Functions Graphs of inverse trigonometric functions; Elementary properties of inverse trigonometric functions.
Unit II: Algebra
1. Matrices Existence of non-zero matrices whose product is the zero matrix; Concept of elementary row and column operations; Proof of the uniqueness of inverse, if it exists.
2. Determinants Properties of determinants; Consistency, inconsistency and number of solutions of system of linear equations by examples.
Unit-III: Calculus
1. Continuity and Differentiability Rolle’s and Lagrange's Mean Value Theorems (without proof) and their geometric interpretation.
2. Applications of Derivatives Rate of change of bodies, use of derivatives in approximation
3. Integrals ∫ √𝑎x2 + 𝑏𝑥 + 𝑐 dx,∫(𝑎𝑥 + 𝑏)√𝑎𝑥2 + 𝑏𝑥 + 𝑐 dx ; Definite integrals as a limit of a sum.
4. Applications of the Integrals Area between any of the two above said curves.
5. Differential Equations Formation of differential equation whose general solution is given; Solutions of linear differential equation of the type: dx/dy+px=q, where p and q are functions of y or constants.
Unit-IV: Vectors and Three Dimensional Geometry
1. Vectors Scalar triple product of vectors.
2. Three - dimensional Geometry Angle between (i) two lines, (ii) two planes, (iii) a line and a plane
Unit-V: Linear Programming
1. Linear Programming Mathematical formulation of L.P. problems; (unbounded)
Unit-VI: Probability
1. Probability Mean and variance of random variable. Binomial probability distribution.

Deleted Portion of CBSE Class 12 Biology

Given below are the deleted topics from CBSE Class 12 Biology.

Chapter/ Unit Name Removed Topics
Unit-VI Reproduction
Chapter-1: Reproduction in Organism 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.
Unit-VII Genetics and Evolution
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 9: Strategies for Enhancement in Food Production Animal husbandry, Plant breeding, tissue culture, single cell protein.
Unit-X Ecology and Environment
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 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; exemplifying case study as success story addressing environmental issue(s).

Deleted Portion From Class 12 Biology Practical

A: List of Experiments

  • Study the presence of suspended particulate matter in air at two widely different sites.
  • Study the plant population density by quadrat method.
  • Study the plant population frequency by quadrat method.

B. Study/Observer of the following (spotting)

  • Pollen germination on stigma through a permanent slide or scanning electron micrograph.
  • Mendelian inheritance using seeds of different colour/sizes of any plant.
  • Controlled pollination - emasculation, tagging and bagging.

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