Kinderston Publications - shardapress.com strong muscles of the stomach use digestive juices to digest the food. It ... Cooking makes the food soft, tasty and easily ... Teeth help

Kinderston Publications(A Unit of Sharda Press)

New Delhi ● Chennai ● Guwahati

2 Active Science Answer Book-4

Answers to Coursebook (Unit-1)Chapter-1 (Summative Assessment)

A. 1. We need food because it gives us energy to work and play. Food helps us to grow. It protects us from diseases.

2.Food contains different substances, which are useful to our body. Thesesubstances are called nutrients.

3. Wheat and rice are the two food which are rich in carbohydrates. 4. Potassium and sodium are the two minerals which are needed in small amounts

by our body. 5.Adietthatcontainstherightamountofcarbohydrates,proteins,fats,mineral

salts,vitamins,roughageandwateriscalledabalanceddiet. 6.Theprocessofbreakdownoffoodintosimplersubstancesisknownasdigestion.

The foodweeat isusedbyourbodytogetenergy todoworkandalso forgrowth.But,thisfoodcannotbeusedasitis,ithastobebrokendownintoverysimple soluble forms.

7.Thestrongmusclesof thestomachusedigestive juices todigest the food. Itchanges the mashed food into a semi solid form.

8.Theundigestedfoodmovesfromthelargeintestinesintotherectum.Itisfinallypassed out through the anus.

B. 1. Wheat — Carbohydrates 2. Pulses — Proteins 3. Mango — Proteins 4. Papaya — Vitamins 5. Milk — Minerals 6. Fish — Proteins 7. Spinach — Vitamins 8. Rice — CarbohydratesC. 1.Proteinshelpourbodytogrow.Theyhelpourbodytobuildmuscles,other

organsandblood.Theyalsohelpustorepairthewearandtearofthebody. 2.Vitaminskeepushealthy.Theyprotectusfromvariousdiseases.Mineralshelp

inthemotionofbones,teethandblood.So,vitaminsandmineralsarecalledprotective foods.

3.Fruits andvegetables aregrown infields.Therefore,dust andmudstick tothem.Thesedustandmudcarrygerms,whichcausesdiseases.So,theymustbe washed before eating.

4. Cookingmakesthefoodsoft,tastyandeasilydigestible.D. 1. (c) 2. (d) 3. (e) 4. (a) 5. (b)E. 1. Food 2. Vitamins 3. Saliva 4. Oesophagus/Alimentary canal 5.bile,fatsF. 1. (iv) 2. (iii) 3. (iii) 4. (iii) 5. (iii)

3Active Science Answer Book-4

Answers to Coursebook (Unit-2)

Chapter-2 (Summative Assessment)

A. 1.Teethhelpustochewfood,giveshapetoourfaceandtospeakclearly. 2. Milk teeth are temporary set of teeth during childhood. A full set of 32 teeth are

known as permanent teeth. 3.Therearefourtypesofteethinsidethemouth.Theyare—incisors,canines,

premolarsandmolars.Incisorshaveasharpstraightcuttingedgetocutandbitethefood.Caninesaresharpandpointed.Theyhelptotearfood.Premolarshelp to crack down hard food. Molars help in grinding the food.

4. (For students). 5.Brushing,flossing,eatingrightandregularvisitstothedentistcanhelpteeth

last life time. 6. A man has four sets of teeth during his life time. 7.Microbesareextremelysmallorganismsthatarefoundinwater,soil,food,air,

etc.Thereare fourkindsofmicrobes.Theseare :bacteria,viruses,protozoaand fungi.

8.Theexamplesofmicrobesusefultousare: (i) Some bacteria help in baking bread and making wines. (ii) Some bacteria help in the decay of dead plants and animals. (iii) Some bacteria help to digest food in animals. (iv) Some bacteria produce vitamins in our body.B. 1. Cavity : A hole in the teeth is called cavity. 2. Denture :Anartificialsetofteethiscalleddenture. 3. Pulp : Thesoftmaterialinsidethedentineiscalledpulp. 4. Enamel : It is the hard white substance that forms the outer part of a tooth.C. 1. apatite 2. crown 3. premolars 4. pulp 5.root 6.tuberculosis,smallpoxD. 1.(F) 2.(F) 3.(F) 4.(T) 5.(T) 6.(T) 7.(T) 8.(F)E. 1. (i) 2. (iii) 3. (iv) 4. (ii) 5. (iii) 6. (iv)


A. 1. We should follow safety rules because they keep us safe and avoid accidents. 2. Theprecautionstoavoidfallingdownathome: (i) Keepthefloorsathomecleananddry.Takecarethatthebathroomand


thekitchenfloorsarenotslippery. (ii) Thingsliketoys,booksetc.shouldnotbeleftscatteredonthefloor. (iii) Be careful while climbing and coming down the stairs. 3. Crosstheroadatthezebracrossingoratthegreensignalforthepedestrians. 4. We should not walk or cross the railway tracks. 5. Safetyrulestobefollowedathome: (i) Do not play with electrical appliances. (ii) Donotplaywithsharporpointedobjects. (iii) Donotclimbonshelves,windows,tablesetc. (iv) Do not play with breakable things like glass. 6. Safetyrulestobefollowedintheclassroom: (i) Do not play in the classroom. (ii) Do not climb on the desks. (iii) Donotfightwiththefriends. 7.Firstaidisthemedicalhelpgiventoaninjuredorasickpersonbeforeproper

medical aid arrives. 8.Ifapersonhasburnthisfingerswhileplayingwithamatchbox,shouldbe

givenfirstaidhelp.First, theburntplaceshouldbewashedwithwaterandthen an antiseptic cream should be applied on it.

9. (a) Keep the nose closed for 5 to 10 minutes while bleeding. Breathe through mouth.

(b) Ifapersonfaints,makehimliedownforawhile,keeptheheadlowforthe extra blood to reach the brain. Allow fresh air around the person.

(c) Rushthepoisonaffectedpersontoadoctor.Also,carry thesource thatcausedthepoisoning.Thiswillhelpthedoctortotaketherightaction.

(d) Washtheaffectedareathroughlywithwater.Puticepackfor10minutestill the burning sensation is reduced. Put some soothing cream.

B. 1. footpath 2. safety 3. Prevention 4. minor 5. wet handsC. 1. (e) 2. (a) 3. (b) 4. (c) 5. (d)D. 1.(F) 2.(F) 3.(T) 4.(T) 5.(F)E. 1.Incaseofnosebleeding,keepthenoseclosedfor5to10minutes.Breaththrough

mouth. 2.Incaseoffaint,makethepersonliedownforawhile.Keeptheheadlowfor

the extra blood to reach the brain. Allow fresh air around the person. 3.Wash cutswithwater.Then clean themwith cotton soaked in an antiseptic

solutionlikeDettolorSavlon.


4.Try to remove the stingwith a sharp object.Never pinch it.Wash the areathroughly with water. Put ice pack for 10 minutes and then use a soothing cream.

5. Dip the part in cold water or hold the burnt part under running water for some time.

F. 1. Neverrunifyourclothescatchfire,asthiswillfanthefireandspreadit. 2. In case you see an accident stay calm. It will help you remember what you need

to do at that time. 3. Poisonous chemicals should be stored away from food as it can be harmful for

us. 4.Syntheticclothescatchfireeasily. 5.Ifafirestartsintheplace,covernoseandmouthwithawetcloth.Smokekills

morepeoplethanactualfires.



A. 1.Wewearclothestoprotectourselvesfromheat,cold,rain,insectbitesandmakeus look good.

2. We wear light coloured clothes in summer as they protect us from the heat of the Sun.

3. We wear thick heavy woollen clothes in winter. 4.Wemakeclothesfromtwowindsoffibres–naturalandman-made. 5.Silkclothesshouldbewashedwithagentlesoaporcanbedry-cleaned.Woollen

clothesshouldbestoredproperlyinabox.Whilestoring,naphthaleneballsorneem leaves should be placed between the layers of the clothes.

6.Naturalfibrescomefromplantsoranimals.Wegetsilk fromsilkwormandwoolfromsheep,camel,goat,yak,etc.Syntheticfibresaremadeinfactoriesfrom crude oil and chemicals.

7. Before storing and packing clothes they should be put out in the sun to rid themofgerms.These shouldbe storedproperly inaboxoralmirah.Whilestoring,naphthaleneballsordryneemleavesshouldbeplacedbetweenthelayers of the clothes.

B. 1. Cotton Jute 2. Nylon Rayon 3. Moths Cockroaches


C. 1. insects 2. winter 3. comfortable 4. Weather 5. lightD. 1.(F) 2.(T) 3.(F) 4.(F) 5.(T)E. 1. Rubber2.nylon 3.silk 4.Cotton 5.woolG. 1. We wear woollen and dark coloured clothes in winter because they help to

absorb the sunlight and are thick. 2.Cottonclothesarehealthiertowearasithastinyspaceswhichletairpassin

and out. 3. Clothes should be put in the sun before storing because the sun get them rid of

germs. 4.Naphthaleneballsanddryneemleavesprotectclothesfrommoths,silverfish

and other pests like rats and cockroaches.


A. 1.Anythingwhichhasmassandoccupiesspaceiscalledmatter. 2.Matterismadeoftinyparticlescalledmolecules. 3.Solids have a fixed shape and volume and cannot flow. Tables, chairs and

bucketsaresolid.Liquidshaveafixedvolumebutnofixedshape.Theycanflow.Waterisaliquid.Gaseshaveneitherfixedshapenorvolume.Theycanflowandoccupyallthegivenshape.

4.Whenaliquidisheated,themoleculesbecomefree.Theliquidchangesintogasorvapourstate.Thisphenomenoniscalledevaporation.

5.Whena liquid is cooled, itsmolecules comeeven closer.They freeze into aclosepackandturnintosolid.Thisprocessiscalledfreezing.

6.Whenaliquiddissolvesasolidsubstanceinit,itiscalledasolution. 7.Thechangesinwhichthemoleculesofasubstancedonotformnewmolecules

are called physical changes. Change in which new molecules are formed are called chemical changes.

8. We can change ice into steam by heating it.B. 1. evaporation 2.condensation 3.freezing 4.meltingC. 1.(T) 2.(F) 3.(T) 4.(F) 5.(T) 6.(F) 7.(F) 8.(T)D. 1. Salt—solvent 2. Water—solute 3. Salt water—solution 4. Burning candle—physical change 5. Cooked vegetable—chemical changeE. 1. Glass 2.Wood 3.Metal 4.IronF. 1. solid 2.liquid 3.gas 4.heating,cooling 5.insoluble 6 .solution


G. 1. (ii) 2. (i) 3. (i) 4. (ii) 5. (iii)



A. 1.Water, carbon dioxide, chlorophyll and sunlight are required by plants toprepare their food.

2.Thegreenleavesofaplantpreparefood,sotheyarecalledthefoodfactoriesofthe plant.

3.(Selfattemptquestion). 4.Humanbeingandanimalsneedfoodandoxygentolive.Theygetthesefrom

plants.Thus,animalsdependonplant.Plantsalsodependonanimals.Plantsneedcarbondioxidetopreparetheirfood.Theygetitfromanimalswhentheybreathe out carbon dioxide.

5. A balance needs to be maintained between the number of plants and animals. If abalanceisnotmaintained,oxygenandfoodwouldnotbeenoughforanimals.Animals would become homeless if forests and trees are cut.

B. 1. Photosynthesis : The process of preparation of food in the green leaves ofplants is known as photosynthesis.

2. Stomata :Theminuteporesoropeningsontheleafarecalledstomata. 3. Bleaching : Removing of green colour from the leaves is known as bleaching. 4. Chlorophyll : Thegreensubstanceintheleafisknownaschlorophyll.C. 1. Chlorophyll 2. Photosynthesis 3. Water and alcohol 4. Oxygen 5. Carbon dioxideD. 1. Mushrooms Moulds 2. Glucose Sugar 3. Sugarcane Carrot 4. Spinach Peas 5. Cactus Date palmE. 1. Chlorophyll 2. Stomata 3. Starch 4. Carbon dioxide 5. OxygenF. 1.Plantstraptheenergyofsunlighttopreparetheirfood.Theyusesomeofthis

energy for their growth. Some energy is also stored in their body in the form of starch.

2. Leaves are green in colour due to the presence of a green pigment called chlorophyll.

3. Bleaching can remove the chlorophyll from the leaf.


4.Anon-greenleafdonothavechlorophyll.So,theycannotmaketheirfood. 5.Cactus do not have leaves. Photosynthesis takes place in their green fleshy

stem.G. 1. chlorophyll 2. decaying 3. starch 4. oxygen 5. stomataH. 1.(F) 2.(F) 3.(F) 4.(T) 5.(T) 6.(T)

(Formative Assessment) A. Find the following parts of a plant in the word search by looking down vertically

( ↓)andhorizontally(→ ).


A. 1.The natural process by which plants adjust to their surroundings is calledadaptation.

2.Plantsthatgrowonlandarecalledterrestrialplants.Firtree,mango,banyan,coconut are types of terrestrial plants.

3.Theterrestrialplantsgrowinplaceswithplentyofrainandsunlight. 4.Theconiferoustreesareusuallyfoundinmountainsandhillyareas.Theydo

notshedalltheirleavesatthesametime.Theyarealwaysgreen.So,theyaremostly evergreen.

5.Theplantsthateatinsectsarecalledinsectivorousplants. 6.Thereisalotofrainfallintherainforest.So,theyarecalledrainforest.B. 1. Duckweed Waterlettuce 2. Hydrilla Tapegrass 3. Cactus Prickly pear


4. Maize Wheat 5. Banyan SalC. 1. cedar—hilly area 2. peepal—plains 3. pepper—hot and damp place 4. cactus—desert 5. mangroves—marshy lands 6. tapegrass—under waterD. 1.(T) 2.(T) 3.(T) 4.(T) 5.(F) 6.(T)E. 1. (ii) 2. (ii) 3. (ii) 4. (ii) 5. (iii)F. 1. terrestrial 2. coniferous 3. mangroves 4. upper 5. stomataH. 1.Mostdesertplantsgrow roots that spreadout justbelow the surfaceof the

ground so that the root can absorb most of the water that falls on the ground. 2. Thespinespreventlossofwaterandalsoprotecttheplantsfromanimals. 3. Thestemisfleshybecausetheystorewater. 4. Thestemofdesertplantspreparefood.

Summative Assessment-IA. 1. (iv) 2. (iii) 3. (ii)B. 1. We need food to get energy. It helps us to grow. It protects us from diseases. 2. Milk teeth are temporary set of teeth during childhood. A full set of 32 teeth are

known as permanent teeth. 3.If apersonhasburnthisfingerswhileplayingwithamatchboxshouldbe

givenfirstaidhelp.First, theburntplaceshouldbewashedwithwaterandthen an antiseptic cream should be applied on it.

4.Weshouldputoutclothesinsunlight.Theyshouldbestoredproperlyinaboxoralmirah.Whilestoringclothes,naphthaleneballsordryneemleavesshouldbe placed between the layers of clothes.

5.Thechangesinwhichthemoleculesofasubstancedonotformnewmoleculesare called physical changes. Change in which new molecules are formed are called chemical changes.

6.(Selfattemptquestion).C. 1.(F) 2.(T) 3.(T) 4.(F) 5.(T)D. 1. Vitamins 2.tuberculosis,smallpox 3.minor 4.insects 5.heating,cooling 6.oxygen 7.ConiferousE. 1. (c) 2. (d) 3. (e) 4. (a) 5. (b)


A. 1. Animals need to reproduce so that life on earth goes on.


2.Theanimalswhichreproducebygivingbirthtoyoungonesarecalledmammals. 3.Theanimalslayseggsfromwhichtheyoungoneshatchout. 4.Theprocessbywhichbabyinsectsshedtheirskinsbeforetheygrowintoan

adult is called moulting. 5. Mammals take care of their babies for long period of time. Usually the mothers

carefortheyoung.Themotherfeedstheiryoungoneswiththeirownmilk. 6.Thefourstagesinthelifecycleofabutterflyare—egg,larva,pupaandadult.B. 1. embryo 2. moulting 3. shell 4. caterpillar 5. amphibiansC. 1. Whale 2. Frog 3. Parent insectsD. 1. caterpillar 2. Yolk 3. embryo 4. inside 5. Black roachE. 1. SPARROW 2. BIRD 3. KITTEN 4.YOLK 5. MaggotsF. 1.(F) 2.(T) 3.(F) 4.(T) 5.(T) 6.(T) 7.(F) 8.(F) 9.(T)G. 1. Bird 2. Squirrel


A. 1.Animalsaregroupedaccordingtotheirhabitatas:(a)Terrestrial,(b)Aquatic,(c)Amphibian,(d)Aerialand(e)Arboreal.

2. A camel has broad feet almost as large as a plate. It helps it to walk easily on the softsand.Camelcanstorefoodintheformoffatinitshump.Itcanstorewaterin its stomach. It has thick lips so that it can eat prickly desert plants.

A polar bear has broad paws with rough skin and rough hair on them. It has two layers of fur and a thick layer of fat. It can close its nostrils while diving.

3.Terrestrial animalshave legs tomoveand lungs tobreathe.Theyhavewelldeveloped sense organs and a nervous system in order to sense the changes in their surroundings.

4. Some animals change their colour because their predator or pray cannot see them.

5.Animals aregroupedaccording to the food they eat.Thesegroupsare : (a)Herbivores,(b)Carnivores,(c)Omnivores,(d)Decomposersand(e)Scavengers.

6.Animalsmigrate in searchof food, forwarmer climate, for layingeggsandbringing up their young ones in a safer place.

B. 1. Adaptation : It is the process of changing to suit the environment. 2. Habitat : It is the natural surroundings of an animal in which it lives. 3. Camouflage : It is the ability to merge with the surroundings to guard against

energy. 4. Hibernation : It is long winter sleep of animals.


5. Mimicry : Copying the colours and similar behaviour is known as mimicry. 6. Migration : Mass movement of animals to escape very cold weather and

shortage of food is known as migration.C. 1. Camel Snake 2. Fish Dolphin 3. Bat Parrot 4. Monkey Squirrel 5. Frog SalamandersD. 1. Aquatic—Crab 2.Terrestrial—Camel 3. Aerial—Bat 4. Omnivore—Crow 5. Colour protection—Leaf insectE. 1.(F) 2.(T) 3.(T) 4.(F) 5.(F) 6.(T) 7.(F)F. 1. habitat 2.terrestrial 3.Monkey,Sloth 4.Fungi,Bacteria 5.gillsG. 1. Camel 2.Tiger 3.Snake 4. Bat 5. Mosquito 6. FrogH. 1. (ii) 2. (ii) 3. (ii)



A. 1. A push or pull that makes a body move or stop moving is known as force. 2.Simplemachinesareverysimple,anddonothavetoomanypartsorattachments.

Thesetoolsmakeourworkeasy. 3. Energy is the ability or capacity to do work. 4. When force is applied on a body to make it move through a distance is known

as work. 5.Frictionisaforcepresentwhentwoobjectsareincontactwitheachother.It

also works against motion. 6.Sunisthemainsourceofenergy.Wegetheatandlightfromthesun.Thegreen

plantstrapthisenergyandmakefood.Plants,animalsandhumanbeingsusethis food to get energy.

B. 1. tools 2.electrical 3.push,pull 4.Sun 5.abilityC. 1.(T) 2.(F) 3.(F) 4.(T) 5.(T)D. 1. Electric bulb—electrical energy to light energy. 2. Coalfire—chemicalenergytoheatandlightenergy. 3. Television—electricalenergytolightandsoundenergy.


4. Batteries—chemicalenergytoelectricalenergy. 5. Petrol engine in car—heat energy to mechanical energy.F. 1. (ii) 2. (iii) 3. (iii) 4. (iv) 5. (ii)


A. 1.TheSunandtheeightplanetsbelongtothefamilycalledthesolarsystem. 2.TheeightplanetsinorderoftheirdistancefromtheSunareMercury,Venus,

Earth,Mars,Jupiter,Saturn,UranusandNeptune. 3.TheEarthspinsarounditsownaxis.Thismovementiscalledrotation. 4.Seasonsarecauseddueto(a)revolutionoftheearthonitsorbit,(b)Earth’stilt

to one side. 5. Satellite is a heavenly body orbiting the earth or another planet. 6.LayersoftheEarth :Thehardouterlayeroftheearthiscalledcrust.Under

the crust is a rocky layer called the Mantle. Beneath the mantle is a layer of hot molten metal called the core. Deep beneath the crust is molten rock called Magma.

B. 1. Orbit 2.Neptune 3.Axis 4.Earth 5.LavaC. 1. star 2.Solar 3.Jupiter 4.surface 5.Magma 6. rotation,revolutionD. 1. Pole 2. Asteroids 3. Magma 4. Extinct volcano 5. EquatorE. 1. (F) 2. (F) 3. (F) 4. (F) 5. (F)F. 1. Planet having life—Earth 2. Planet nearest to the sun—Mercury 3. Largestplanet—Jupiter 4.Planetknownasredplanet—Mars 5. Planet closest to the earth—VenusG. 1. (ii) 2. (ii) 3. (iii) 4. (ii) 5. (i)


A. 1.Thecoolairfromthelandmovesintowardstheseaandtakesitsplace,iscalledlandbreeze.Duringthenight,thelandgetscooler,fasterthanwater.Theairabove the sea becomes warm and rises up.

2. Water gets evaporated due to the heat of the sun and forms clouds causing rain. It is known as evaporation.

Whenwatervapourcoolsdownitchangesintodropsofwater.Thisiscalledcondensation.

3.Thesuncausesallweatherchanges.Thesunaffectsthemovementofair.Italsochangestheformofwatermakingthedaycloudy,rainyorsunny.


4.Whenthesunisoverheadatnoon,sunlightfallsdirectlyontheearthandwefeelhot.Inthemorningandeveningthesun’sraysareslanting,sowedonotfeel so hot.

5. Change of water to water vapour and back to water in nature is called water cycle.

6.Themovementofthewindisaffectedbythesun.Theheatofthesunheatsuptheair.Afterheating,airbecomeslighterandrises.

7.InsolubleimpuritiesinwatercanberemovedthroughSedimentation,Decan-tation,Filtration.

B. 1. Weather : It is the condition of the atmosphere of a place at a particular time. 2. Water conservation : The wise and judicious use of water is called water

conservation. 3. Convection currents : Movement caused by hot and cold wind is known as

convection currents. 4. Filtration :Purifyingimpureliquidbystrainingiscalledfiltration. 5. Evaporation : Water changing into water vapour on heating is known as

evaporation.C. 1.Landbreezeblowsfromthelandtowardstheseaatnight.Theseabreezeblows

from the land towards that land during the day. 2. Impurities that dissolve in water is known as soluble impurities. Impurities

that do not dissolve in water is known as insoluble impurities. 3.Settling down of heavy insoluble impurities in a liquid is known as

sedimentation.Gentlypouringliquidintoanothervesselaftersedimentationis known as decantation.

4. Water changing into water vapour on heating is known as evaporation. Water vapour changing into water on cooling is known as condensation.

5.Inwinter,thewatervapourintheaircondensesondustparticlesandformsacloudjustabovetheground.Thisiscalledfog.Inwinters,whenwatervapourcondensesoncoldobjectslikeleaves,flowersandwindowpanes.Itiscalleddew.

D. 1. Sunny day — Evaporation 2. Cloudy day — Rain 3. Cold day — Hail 4. Pleasant day — Sweat 5.Humidday — BreezeE. 1. False 2.False 3.False 4.False 5.True 6.False


A. 1. Addition of harmful substances into the environment is called pollution.


2. Air becomes polluted when smoke and other particles mix with it. 3. All smoke releasing industries should be located outside the city. It can control

air pollution. 4.Thefactoriesrelease theirsewageorwastematerial intorivers.Thissewage

contains many poisonous chemicals. 5.Soilpollutioniscausedbydomestic,industrialandagriculturalwaste. 6.Theprocessinwhichwastematerialscanbeprocessedandusedagainisknown

as recycling. 7. Municipal corporation is responsible for the disposal of wastes. 8. We send newspapers for recycling because it can be recycled and can be turned

into new products. 9.Burstingofnoisycrackers,constantblowingofhornsandloudspeakerscause

a lot of noise.B. 1. pollution 2. biodegradable waste 3. factories 4. Air and soil pollution 5. noise pollutionC. 1. Pollutants 2.Waste 3.Non-BiodegradableWaste 4. Recycle,Reuse,Reduce 5.RecycleD. 1. factories 2. smoke 3. old 4. insecticides 5. soil 6. cloth 7. air 8. noiseE. 1. (ii) 2. (i) 3. (iii) 4. (iii) 5. (ii)

Summative Assessment-IIA. 1. Thefourstagesinthelifecycleofabutterflyare–egg,larva,pupaandadult. 2. A camel has broad feet almost as large as a plate. It helps it to walk easily on the

softsand.Camelcanstorefoodintheformoffatinitshump.Itcanstorewaterin its stomach. It has thick lips so that it can eat prickly desert plants.

A polar bear has broad paws with rough skin and rough hair on them. It has two layers of fur and a thick layer of fat. It can close its nostrils while diving.

3. Some animals change their colours because their predator or pray cannot see them.

4.Simplemachinesareverysimple,anddonothavetoomanypartsorattachments.Thesetoolsmakeourworkeasy.

5.Seasonsarecauseddueto:(a)revolutionoftheearthonitsorbit,(b)Earth’stiltto one side.

6. Change of water to water vapour and back to water in nature is called water cycle.


7. Addition of harmful substances into the environment is called pollution.B. 1. (ii) 2. (ii) 3. (ii) 4. (ii)C. 1. Planet having life — Earth 2. Planet nearest to the sun — Mercury 3. Largestplanet — Jupiter 4. Planet known as red planet — Mars 5. Planet closest to the earth — VenusD. 1. caterpillar 2.Monkey,sloth 3.habitat 4. solar 5. deforestation

Documents

Kinderston Publications - shardapress.com strong muscles of the stomach use digestive juices to digest the food. It ... Cooking makes the food soft, tasty and easily ... Teeth help