Revised syllabus (2020-21) updated

Class 10 : Science Syllabus (2020-21) For CBSE Board Exam

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 Unit I: Chemical Substances - Nature and Behaviour

REVISED TOPICS

Chemical Substances - Nature and Behaviour Chemical reactions: Chemical equation, Balanced chemical equation, implications of a balanced chemical equation, types of chemical reactions: combination, decomposition, displacement, double displacement, precipitation, neutralization, oxidation and reduction.

Acids, bases and salts: Their definitions in terms of furnishing of H+ and OH- ions, General properties, examples and uses, concept of pH scale (Definition relating to logarithm not required), importance of pH in everyday life; preparation and uses of Sodium Hydroxide, Bleaching powder, Baking soda, Washing soda and Plaster of Paris.

Metals and nonmetals: Properties of metals and non-metals; Reactivity series; Formation and properties of ionic compounds.

Carbon compounds: Covalent bonding in carbon compounds. Versatile nature of carbon. Homologous series.

Periodic classification of elements: Need for classification, early attempts at classification of elements (Dobereiner’s Triads, Newland’s Law of Octaves, Mendeleev’s Periodic Table), Modern periodic table, gradation in properties, valency, atomic number, metallic and non-metallic properties.

TOPICS REMOVED

Metals and Non-metals: Basic Metallurgical processes; Corrosion and its prevention

 Carbon and its Compounds: Nomenclature of carbon compounds containingfunctional groups (halogens, alcohol, ketones, aldehydes, alkanes and alkynes),difference between saturated hydro carbons and unsaturated hydrocarbons.Chemical properties of carbon compounds (combustion, oxidation, addition and substitution reaction). Ethanol and Ethanoic acid (only properties and uses),soaps and detergents.


 Unit II: World of Living

REVISED TOPICS

Life processes: ‘Living Being’. Basic concept of nutrition, respiration, transport and excretion in plants and animals.

 Reproduction: Reproduction in animals and plants (asexual and sexual) reproductive healthneed and methods of family planning. Safe sex vs HIV/AIDS. Child bearing and women’s health.

 Heredity: Heredity; Mendel’s contribution- Laws for inheritance of traits: Sex determination:
brief introduction;
TOPICS REMOVED

Control and co-ordination in animals and plants: Tropic movements in plants; Introduction of plant hormones; Control and co-ordination in animals: Nervous
system; Voluntary, involuntary and reflex action; Chemical co-ordination: animal hormones.

 Heredity and Evolution:Basic concepts of evolution.

Unit III: Natural Phenomena

REVISED TOPICS

Reflection of light by curved surfaces; Images formed by spherical mirrors, centre of curvature, principal axis, principal focus, focal length, mirror formula (Derivation not required), magnification.

 Refraction; Laws of refraction, refractive index. 

 Refraction of light by spherical lens; Image formed by spherical lenses; Lens formula (Derivation not required); Magnification. Power of a lens.

 Refraction of light through a prism, dispersion of light, scattering of light, applications in daily life.
TOPICS REMOVED

The Human Eye and the Colourful World: Functioning of a lens inHuman eye, defects of vision and their corrections, applications of spherical mirrors and lenses.


Unit IV: Effects of Current

REVISED TOPICS

Electric current, potential difference and electric current. Ohm’s law; Resistance, Resistivity, Factors on which the resistance of a conductor depends. Series combination of resistors, parallel combination of resistors and its applications in daily life. Heating effect of electric current and its applications in daily life. Electric power, Interrelation between P, V, I and R.

 Magnetic effects of current : Magnetic field, field lines, field due to a current carrying conductor, field due to current carrying coil or solenoid; Force on current carrying conductor, Fleming’s Left Hand Rule, Electric Motor, Electromagnetic induction. Induced potential difference, Induced current. Fleming’s Right Hand Rule.
TOPICS REMOVED

Magnetic Effects of Electric Current: Electric Generator, Direct current. Alternating current: frequency of AC. Advantage of AC over DC. Domestic electric circuits.

Unit V: Natural Resources
REVISED TOPICS

Our environment: Eco-system, Environmental problems, Ozone depletion, waste production and their solutions. Biodegradable and non-biodegradable substances.

*****
ONLY FOR INTERNAL ASSESSMENT
Note: Learners are assigned to read the below listed part of Unit V. They can be encouraged to prepare a brief write up on any one concept of this Unit in their Portfolio. This may be an assessment for Internal Assessment and credit may be given (Periodic assessment/Portfolio). This portion of the Unit is not to be assessed in the year-end examination.

Management of natural resources: Conservation and judicious use of natural resources.
Forest and wild life; Coal and Petroleum conservation. Examples of people’s participation for
conservation of natural resources. Big dams: advantages and limitations; alternatives, if any.
Water harvesting. Sustainability of natural resources.
TOPICS REMOVED
Sources of energy: Different forms of energy, conventional and nonconventional sources of energy: Fossil fuels, solar energy; biogas; wind, water and tidal energy; Nuclear energy. Renewable versus non-renewable sources of Energy

PRACTICAL

REVISED TOPICS

Practical should be conducted alongside the concepts taught in theory classes
LIST OF EXPERIMENTS
1. Studying the properties of acids and bases (HCl & NaOH) on the basis of their reaction with

  • Litmus solution (Blue/Red) 
  • Zinc metal
  • Solid sodium carbonate


 2. Performing and observing the following reactions and classifying them into:

  • Combination reaction
  • Decomposition reaction
  • Displacement reaction
  • Double displacement reaction
  1. Action of water on quicklime
  2. Action of heat on ferrous sulphate crystals
  3. Iron nails kept in copper sulphate solution
  4. Reaction between sodium sulphate and barium chloride solutions

3. Observing the action of Zn, Fe, Cu and Al metals on the following salt solutions: 

  • ZnSO4(aq)
  • FeSO4(aq)
  • CuSO4(aq)
  • Al2 (SO4)3(aq)

Arranging Zn, Fe, Cu and Al (metals) in the decreasing order of reactivity based on the above result.

 4. Studying the dependence of potential difference (V) across a resistor on the current (I) passing through it and determining its resistance. Also plotting a graph between V and I. 

 5. Experimentally show that carbon dioxide is given out during respiration.

 6. Determination of the focal length of (i) Concave mirror and (ii) Convex lens by obtaining the image of a distant object.

 7. Tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. Measure the angle of incidence, angle of refraction, angle of emergence and interpret the result. 

 8. Studying (a) binary fission in Amoeba, and (b) budding in yeast and Hydra with the help of prepared slides.

 9. Tracing the path of the rays of light through a glass prism.


DELETED PRACTICALS
1. Finding the pH of the following samples by using pH paper/universal indicator:

  • Dilute Hydrochloric Acid
  • Dilute NaOH solution
  • Dilute Ethanoic Acid solution
  • Lemon juice
  • Water
  • Dilute Hydrogen Carbonate solution
  • Determination of the equivalent resistance of two resistors when connected in series and parallel.

3. Preparing a temporary mount of a leaf peel to show stomata.
4. Study of the following properties of acetic acid (ethanoic acid):

  • Odour
  • solubility in water
  • effect on litmus
  • reaction with Sodium Hydrogen Carbonate

5. Study of the comparative cleaning capacity of a sample of soap in soft and hard water.
6. Finding the image distance for varying object distances in case of a convex lens and drawing corresponding ray diagrams to show the nature of image formed.

7. Identification of the different parts of an embryo of a dicot seed (Pea, gram or red kidney bean)


Removed Internal Assessment 


Management of natural resources: Conservation and judicious use of natural resources. Forest and wild life; Coal and Petroleum conservation. Examples of people’s participation for conservation of natural resources. Big dams: advantages and limitations; alternatives, if any. Water harvesting. Sustainability of natural resources.