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Thursday, 4 April 2019

WELCOME TO THE NEW SESSION

Note-Students you must paste the syllabus in your notebook


SCIENCE (Code No. 086)
Class: IX and X (2019-20)


The  subject  of  Science  plays  an  important  role  in  developing  well-defined  abilities  in cognitive, affective and psychomotor domains in children. It augments the spirit of enquiry, creativity, objectivity and aesthetic sensibility.
Upper primary stage demands that a number of opportunities should be provided to the students  to  engage  them  with  the  processes  of  Science  like  observing,  recording observations, drawing, tabulation, plotting graphs, etc., whereas the secondary stage also expects abstraction and quantitative reasoning to occupy a more central place in the teaching and learning of Science. Thus, the idea of atoms and molecules being the building blocks of matter makes its appearance, as does Newtons law of gravitation.
The present syllabus has been designed around seven broad themes viz. Food; Materials; The World of The Living; How Things Work; Moving Things, People and Ideas; Natural Phenomenon and Natural Resources. Special care has been taken to avoid temptation of adding too many concepts than can be comfortably learnt in the given time frame. No attempt has been made to be comprehensive.
At this stage, while science is still a common subject, the disciplines of Physics, Chemistry and Biology begin to emerge. The students should be exposed to experiences based on hands on activities as well as modes of reasoning that are typical of the subject.
General Instructions:

1.  There will be an Annual examination based on entire syllabus.

2.  The annual examination will be of 80 marks and 20 marks shall be for Internal

Assessment.

3.  The components of Internal Assessment would be:

a.  Periodic Assessment of 10 marks that would include:

    For 5 marks- Three periodic tests conducted by the school. Average of the best two tests to be taken. This will have a weightage of 05 marks towards the final result.
    For 5 marks- Diverse methods of assessment as per the need of the class dynamics and curriculum transaction. These may include- short tests, oral test, quiz, concept map, etc. This will also have a weightage of 05 marks towards the final result.

b.  Practical / Laboratory work should be done throughout the year and the student should maintain record of the same. Practical Assessment should be continuous. There will be weightage of 5 marks towards the final result. All practicals listed in the syllabus must be completed.
c.  Portfolio to be prepared by the student- This would include classwork, other sample of student work, self-assessment and peer-assessment. This will carry a weightage of 5 marks towards the final results.

COURSE STRUCTURE CLASS IX
(Annual Examination)                                     Marks: 80



Unit No.
Unit
Marks
Periods
I
Matter - Its Nature and Behaviour
23
50
II
Organization in the Living World
20
45
III
Motion, Force and Work
27
60
IV
Our Environment
06
15
V
Food; Food Production
04
10

Total
80


Internal assessment
20


Grand Total
100





Theme: Materials                                                                                                (50 Periods) Unit I: Matter-Nature and Behaviour
Definition of matter; solid, liquid and gas; characteristics  - shape, volume, density; change of state-melting (absorption of heat), freezing, evaporation (cooling by evaporation), condensation, sublimation.
Nature of matter: Elements, compounds and mixtures. Heterogeneous and homogenous mixtures, colloids and suspensions.
Particle  nature,  basic  units:  Atoms  and  molecules,  Law  of  constant  proportions, Atomic and molecular masses. Mole concept: Relationship of mole to mass of the particles and numbers.
Structure of atoms: Electrons, protons and neutrons, valency, chemical formula of common compounds. Isotopes and Isobars.




Theme: The World of the Living                                                                      (45 Periods) Unit II: Organization in the Living World
Cell - Basic Unit of life : Cell as a basic unit of life; prokaryotic and eukaryotic cells, multicellular organisms; cell membrane and cell wall, cell organelles and cell inclusions; chloroplast, mitochondria, vacuoles, endoplasmic reticulum, Golgi apparatus; nucleus,

chromosomes - basic structure, number.

Tissues, Organs, Organ System, Organism:

Structure  and functions  of  animal  and  plant  tissues  (only four  types  of  tissues  in animals; Meristematic and Permanent tissues in plants).
Biological Diversity: Diversity of plants and animals-basic issues in scientific naming, basis of classification. Hierarchy of categories / groups, Major groups of plants (salient features) (Bacteria, Thallophyta, Bryophyta, Pteridophyta, Gymnosperms and Angiosperms). Major groups of animals (salient features) (Non-chordates upto phyla and chordates upto classes).
Health and Diseases: Health and its failure. Infectious and Non-infectious diseases, their causes and manifestation. Diseases caused by microbes (Virus, Bacteria and Protozoans) and their prevention; Principles of treatment and prevention. Pulse Polio programmes.




Theme: Moving Things, People and Ideas                                                      (60 Periods) Unit III: Motion, Force and Work
Motion: Distance and displacement, velocity; uniform and non-uniform motion along a straight line; acceleration, distance-time and velocity-time graphs for uniform motion and uniformly accelerated motion, derivation of equations of motion by graphical method; elementary idea of uniform circular motion.
Force and Newtons laws : Force and Motion, Newtons Laws of Motion, Action and Reaction forces, Inertia of a body, Inertia and mass, Momentum, Force and Acceleration. Elementary idea of conservation of Momentum.
Gravitation: Gravitation; Universal Law of Gravitation, Force of Gravitation of the earth

(gravity), Acceleration due to Gravity; Mass and Weight; Free fall.

Floatation: Thrust and Pressure. Archimedes’ Principle; Buoyancy; Elementary idea of

Relative Density.

Work, energy and power: Work done by a Force, Energy, power; Kinetic and Potential energy; Law of conservation of energy.
Sound: Nature of sound and its propagation in various media, speed of sound, range of hearing in humans; ultrasound; reflection of sound; echo and SONAR. Structure of the Human Ear (Auditory aspect only).

Theme: Natural Resources: Balance in nature                                              (15 Periods) Unit IV: Our Environment
Physical resources: Air, Water, Soil. Air for respiration, for combustion, for moderating temperatures; movements of air and its role in bringing rains across India.
Air, water and soil pollution (brief introduction). Holes in ozone layer and the probable damages.
Bio-geo chemical cycles in nature: Water, Oxygen, Carbon and Nitrogen.



Theme: Food                                                                                                          (10 Periods) Unit V: Food Production
Plant and animal breeding and selection for quality improvement and management; Use

of fertilizers and manures; Protection from pests and diseases; Organic farming.



PRACTICALS



(30 Periods)


Practicals should be conducted alongside the concepts taught in theory classes. (LIST OF EXPERIMENTS)
1.     Preparation of:

a)        a true solution of common salt, sugar and alum

b)        a suspension of soil, chalk powder and fine sand in water

c)        a colloidal solution of starch in water and egg albumin/milk in water and distinguish between these on the basis of
     transparency

     filtration criterion

     stability

2.     Preparation of

a)        A mixture

b)        A compound

using iron filings and sulphur powder and distinguishing between these on the basis of:

(i)       appearance, i.e., homogeneity and heterogeneity

(ii)      behaviour towards a magnet

(iii)     behaviour towards carbon disulphide as a solvent

(iv)      effect of heat

3.     Separation of the components of a mixture of sand, common salt and ammonium

chloride (or camphor).

4.     Perform the following reactions and classify them as physical or chemical changes:

a)        Iron with copper sulphate solution in water

b)        Burning of magnesium ribbon in air

c)        Zinc with dilute sulphuric acid

d)        Heating of copper sulphate crystals

e)        Sodium sulphate with barium chloride in the form of their solutions in water



5.     Preparation of stained temporary mounts of (a) onion peel, (b) human cheek cells & to record observations and draw their labeled diagrams.
6.     Identification of Parenchyma, collenchyma and Sclerenchyma tissues in plants, striped, smooth and cardiac muscle fibers and nerve cells in animals, from prepared slides. Draw their labeled diagrams.
7.     Determination of the melting point of ice and the boiling point of water.

8.     Verification of the Laws of reflection of sound.

9.     Determination of the density of solid (denser than water) by using a spring balance and a measuring cylinder.
10.    Establishing the relation between the loss in weight of a solid when fully immersed in

a)     Tap water

b)     Strongly salty water with the weight of water displaced by it by taking at least two different solids.
11.    Determination of the speed of a pulse propagated through a stretched string/slinky(helical spring).
12.    Study of the characteristics of Spirogyra, Agaricus, Moss, Fern, Pinus (either with male or female cone) and an Angiospermic plant. Draw and give two identifying features of the groups they belong to.
13.    Observe the given pictures/charts/models of earthworm, cockroach, bony fish and bird. For each organism, draw their picture and record:
a)     one specific feature of its phylum.

b)     one adaptive feature with reference to its habitat.



14.   Verification of the law of conservation of mass in a chemical reaction.

15.    Study of the external features of root, stem, leaf and flower of monocot and dicot plants.

COURSE STRUCTURE: CLASS X

(Annual Examination)





Marks: 80




Unit

No.
Unit
Marks
Periods
I
Chemical Substances-Nature and Behaviour
25
55
II
World of Living
23
50
III
Natural Phenomena
12
23
IV
Effects of Current
13
32
V
Natural Resources
07
20

Total
80


Internal assessment
20


Grand

Total
100





Theme : Materials                                                                                              (55 Periods) Unit I: 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; Basic metallurgical processes; Corrosion and its prevention.
Carbon  compounds:  Covalent  bonding  in  carbon  compounds.  Versatile nature  of carbon. Homologous series. Nomenclature of carbon compounds containing functional groups  (halogens,  alcohol,  ketones,  aldehydes,  alkanes  and  alkynes),  difference

between saturated hydrocarbons 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.
Periodic  classification  of  elements:  Need  for  classification,  early  attempts  at

classification of elements (Dobereiners Triads, Newlands Law of Octaves,

Mendeleevs Periodic Table), Modern periodic table, gradation in properties, valency,

atomic number, metallic and non-metallic properties.



Theme: The World of the Living                                                                 (50 Periods) Unit II: World of Living
Life processes: Living Being. Basic concept of nutrition, respiration, transport and

excretion in plants and animals.

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. Reproduction: Reproduction in animals and plants (asexual and sexual) reproductive health-need and methods of family planning. Safe sex vs HIV/AIDS. Child bearing and womens health.
Heredity and Evolution: Heredity; Mendel’s contribution- Laws for inheritance of traits: Sex determination: brief introduction; Basic concepts of evolution.


Theme : Natural Phenomena                                                                           (23 Periods) Unit III: Natural Phenomena
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.

Functioning of a lens in human eye, defects of vision and their corrections, applications of spherical mirrors and lenses.
Refraction of light through a prism, dispersion of light, scattering of light, applications in daily life.

Theme: How Things Work                                                                                (32 Periods) Unit IV: Effects of Current
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,  Flemings  Left  Hand  Rule,  Electric  Motor,  Electromagnetic  induction. Induced potential difference, Induced current. Flemings Right Hand Rule, Electric Generator, Direct current. Alternating current: frequency of AC. Advantage of AC over DC. Domestic electric circuits.


Theme: Natural Resources                                                                              (20 Periods) Unit V: Natural Resources
Sources of energy:  Different forms of  energy, conventional  and non-conventional sources of energy: Fossil fuels, solar energy; biogas; wind, water and tidal energy; Nuclear energy. Renewable versus non-renewable sources of Energy.
Our  environment:  Eco-system,  Environmental  problems,  Ozone  depletion,  waste production and their solutions. Biodegradable and non-biodegradable substances. Management  of  natural  resources:  Conservation  and  judicious  use  of  natural resources. Forest and wild life; Coal and Petroleum conservation. Examples of peoples participation  for  conservation  of  natural  resources.  Big  dams:  advantages  and limitations; alternatives, if any. Water harvesting. Sustainability of natural resources.


PRACTICALS

Practical should be conducted alongside the concepts taught in theory classes

LIST OF EXPERIMENTS

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



(i)       Dilute Hydrochloric Acid

(ii)      Dilute NaOH solution

(iii)     Dilute Ethanoic Acid solution

(iv)     Lemon juice

(v)      Water

(vi)     Dilute Hydrogen Carbonate solution

B.       Studying the properties of acids and bases (HCl & NaOH) on the basis of their reaction with:
a)      Litmus solution (Blue/Red)

b)      Zinc metal

c)       Solid sodium carbonate

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

A.         Combination reaction

B.         Decomposition reaction

C.         Displacement reaction

D.        Double displacement reaction

(i)       Action of water on quicklime

(ii)      Action of heat on ferrous sulphate crystals

(iii)     Iron nails kept in copper sulphate solution

(iv)     Reaction between sodium sulphate and barium chloride solutions

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

i)      ZnSO4(aq) ii)      FeSO4(aq) iii)     CuSO4(aq)
iv)      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 determine its resistance. Also plotting a graph between V and I.

5.       Determination of the equivalent resistance of two resistors when connected in series and parallel.
6.      Preparing a temporary mount of a leaf peel to show stomata.

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

8      Study of the following properties of acetic acid (ethanoic acid):

i)         odour

ii)        solubility in water

iii)       effect on litmus

iv)       reaction with Sodium Hydrogen Carbonate

9       Study of the comparative cleaning capacity of a sample of soap in soft and hard water.
10     Determination of the focal length of:

i)         Concave mirror

ii)        Convex lens

by obtaining the image of a distant object.

11     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.
12     Studying (a) binary fission in Amoeba, and (b) budding in yeast and Hydra with the help of prepared slides.
13     Tracing the path of the rays of light through a glass prism.

14     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.
15     Identification of the different parts of an embryo of a dicot seed (Pea, gram or red kidney bean).
PRESCRIBED BOOKS:

        Science-Textbook  for class IX-NCERT Publication

        Science-Text book for class X- NCERT Publication

        Laboratory Manual-Science-Class IX, NCERT Publication

        Laboratory Manual-Science-Class X, NCERT Publication

        Exemplar Problems Class IX NCERT Publication

        Exemplar Problems Class X NCERT Publication






1)        Board Examination –Theory

QUESTION PAPER DESIGN Class: IX AND X (2019-20) Subject: Science (086)


Maximum Marks: 80                                                                                         Duration   :   3 Hours

Sr.
Typology of Questions
Objective
SA
LA
Total
No.
Type *
(03 marks)
(05 marks)

(01 mark)


1
Remembering:     Exhibit     memory     of

07

02

01

22.5%
previously  learned  material  by  recalling
facts, terms, basic concepts, and answers.
2
Understanding: Demonstrate


04


02


02


25%
understanding of facts and ideas by
organizing, comparing, translating, interpreting, giving descriptions, and stating main ideas
3
Applying: Solve problems to new situations
by   applying   acquired   knowledge,   facts, techniques and rules in a different way.

04

01

02

21.25%
4
Analyzing and Evaluating: Examine and
break information into parts by identifying motives or causes. Make inferences and find evidence to support generalizations
Present and defend opinions by making judgments  about  information,  validity  of
ideas, or quality of work based on a set of criteria.




05




02




01




20%
5
Creating: Compile information together in
a different way by combining elements in a


-


03


-


11.25%
new    pattern    or    proposing    alternative
solutions.

Total
20 (20)
10 (30)
06 (30)
100%

All questions would be compulsory. However, an internal choice of approximately 33% would be provided.

2)   Internal Assessment: 20 Marks
        Periodic Assessment – 05 marks + 05 marks
        Subject Enrichment (Practical Work) 05 marks
        Portfolio – 05 marks

Note: Objective Section would have 10 MCQ. Besides this, the section would include VSA, Assertion-Reasoning type questions etc.

Tuesday, 12 February 2019

Attention Class 10th

You all must take the marking scheme of Preboard 1&2 already posted in your group and discuss the paper with me .
Clear your library and other dues so that you are ready for the roll numbers to be handed over to you on 19th February after Blessing ceremony.

Best of luck


Thursday, 13 December 2018


Chapter Natural Resources

Chapter Natural Resources

NATURAL RESOURCES
Rain
Rain is formed by evaporation and condensation of water through water cycle in. 
Acid Rain
Acid rain is caused by the release of the gases like SO2 (sulphur dioxide) and NO2(nitrogen dioxide) released from the emission of vehicles and combustion of fuels. These gases dissolve in rain water to form nitric acid and sulphuric acid.
Water
Water is renewable resource.
It is essential for all physiological activities of plants and animals.
Water is mainly present in two forms:
(i) Surface water
(ii) Ground water.
Water Pollution
An undesirable change in the physical, biological or chemical properties of water (due to addition for foreign organic, inorganic substances) that adversely affects the aquatic life, and makes water less fit or unfit for use, is called water pollution.
The main causes of water pollution are as follows:
(i) Addition of harmful substances like fertilisers and pesticides to water
(ii) Removal of desirable substances like oxygen from water
(iii) Change in water temperature
Soil
It is the uppermost layer of Earth’s crust, which supports terrestrial plants, animals and microorganisms.
It is formed from the weathering of rocks by physical, chemical and biological activities by the action of wind, water and sun.
It is made up mainly of mineral particles, organic materials, air, water and living organisms
Humus : The decayed living organisms present in soil is called humus.
Humus makes the soil porous and allows water and air to penetrate deep underground making the soil more fertile.
Soil pollution :
Removal of useful components from the soil and addition of other substances, which adversely affect the fertility of the soil and kill micro-organisms living in it is called soil pollution.
Fertilizers and pesticides destroy the soil structure.
Mosses or Bryophytes are indicator of soil pollution.
Soil Erosion
Removal of topmost layer of soil by wind, water or other activities is called soil erosion.
Causes of soil erosion
Main factors responsible for the soil erosion are:
Over grazing of land.
Removal of top soil by wind (storms) and water (floods).
Deforestation
Leaving land uncultivated for long time.
Effects of Soil Erosion:
Loss of fertility due to loss of topmost fertile soil which results in desertification.
Landslides in hilly areas.
Clogging of water drains and water reservoirs by the washed off soil.
Prevention of Soil Erosion:
Soil can be prevented from getting eroded by implementing the following methods:
Intensive cropping.
Terrace farming.
Aforestation
Making strong embankments along the river banks.
Chipko Movement
It was a movement started to conserve forests.
The movement was led by Shri. Sunder Lal Bahuguna in Garhwal Himalayas.



Biogeochemical cycles
A constant interaction between biotic and abiotic components of the biosphere makes a system and these flow of components form a cycle called biogeochemical cycle.
Some prominent cycles in nature are described below:
1. Water cycle
The whole process in which water evaporates and falls on the land as rain and later flows back into the sea via rivers is known as the water-cycle.
Main steps involved in water cycles are:
a. Evaporation: Water on earth changes to vapour due to sun’s heat and rises above.
b. Transpiration: Plants absorb water through the roots and then give off excess water in the form of vapor through pores in their leaves.
c. Respiration: It is a process in living organisms involving the production of energy, with the intake of oxygen and the release of carbon dioxide along with water vapour.
d. Precipitation: It is the process of condensation of water vapour in atmosphere into liduid which fall down in the form of rain, snow, sleet or hail.
e. Percolation and Absorption: Some of the precipitation soaks into the ground to reach the underground water, some on leand gets absorbed by the plants, crops and trees to grow and the rest downhill as runoff to reach the seas to complete the whole water cycle.
2. Nitrogen cycle
The sequence in which nitrogen passes from the atmosphere to the soil and organisms, and then is eventually released back into the atmosphere, is called nitrogen cycle.
Nitrogen cycle involves following processes:
a. Nitrogen Fixation
It is a processes by which atmospheric nitrogen is converted into the form which can be easily absorbed the organisms on earth.
Nitrogen Fixation is carried out by following ways:
By lightning: When lightning occurs, the high temperature and pressure convert nitrogen and water into nitrates and nitrites which get dissolved in water and are readily used by aquatic plants and animals.
By bacteria- Molecular nitrogen is converted into nitrates and nitrites by free living bacteria or the bacteria like Rhizobium present in the root nodules of legumes. Some bacteria convert the nitrogen gas (N2) to ammonia (NH3) which plants can use.
b. Nitrification: It is the process by which ammonia is converted into nitrites and nitrates.
c. Ammonification: It is the process by which soil bacteria decompose dead organic matter and release ammonia into soil.
d. Denitrification: It is the process by which nitrates are converted into atmospheric nitrogen back to complete the cycle.
3. Carbon cycle
Image result for carbon cycle
The carbon cycle is the process by which carbon moves from the atmosphere into the Earth and its organisms and then back again.
Carbon cycle involves the following processes:
 Photosynthesis : In this process plants form their food by absorbing the atmospheric carbon in the form of carbondioxide gas and release oxygen gas.
Respiration:  In this process plants and animals respire resulting in breakdown of glucose stored in the plants and animals to release CO2, water and energy.
Decomposition: In this process dead plants and animals get decomposed to release carbon into the environment.
Combustion: Burning of fossil fuels releases carbon dioxide gas into the environment as by product.
Movement of carbon from the atmosphere to the oceans: The oceans, and other water bodies, soak up about a quarter of the carbon dioxide to form carbonates.
Thus, the amount of carbon –dioxide, so formed, is almost equal to the amount of carbon dioxide consumed & hence, its concentration in air remains same.
4. Oxygen cycle
Simple diagram of the oxygen cycle
The cyclic process by which oxygen element is circulated continuously through the living and non-living components of the biosphere constitutes oxygen cycle.
Oxygen cycle involves the following processes:
a. Respiration: All living organisms take in simple sugars (glucose) and oxygen and release carbon dioxide, water and energy.
b. Combustion: During the processes of combustion (or burning), oxygen reacts with carbon to form carbon dioxide gas.
c. Photosybthesis: Carbondioxide gas from atmosphere is absorbed by green plants in the presence of sunlight to form carbohydrates and oxygen. Thus, oxygen is liberated in atmosphere.
Green House Effect
Greenhouse gases such as carbon dioxide, methane, nitrogen oxide and Chlorofuorocarbans present in atmosphere prevents the escape of heat falling on Earth’s surface rather than absorbing it. This keeps the Earth warm and the phenomenon is known greenhouse effect.
Ozone layer :
Three molecules of oxygen combine to form ozone which forms a layer in stratosphere.
It acts as a protective shield as it prevents harmful ultraviolet radiations to reach the earth.
Compounds like CFCs (Chloro fluorocarbons) reacts with ozone releasing molecular oxygen resulting in breakdown of ozone, which is termed as ozone depletion.