UNIT-1 HABITAT

I.Choose the correct answer .

1.The fishes living in river water face this problem.

Ans:a)exit of water from body fluid

b)entry of water into body fluid

c)entry of salts into body fluid

d)entry of water and exit of salts

2.Very high salinity is found in

a)pond b)river

c)ocean d)estuary

3.The camel live in

a)forest habitat b)desert habitat

c)aquatic habitat c)grass land haditat

II.Fill in the blanks.

1.physical condition in a habitat determine the plants and animals to live in the

habitat.

2.The most important abiotic component of aquatic habitat is salinity.

3.The quantity of rainfall in dersert habitat is 25cm per year.

II.Match the following.

1)Dry weather and -dersert

Meager rainfall

2)Moderate salinity-estuary

3)High rainfall and fertile soil-forest

4)Dissolved oxygen-aquatic habitat

5)least amount of light-deep sea

II.Answer the following.

1.What is habitat?

Ans:Habitat is the place where plants and animals live.

2.Name the plants of desert habitat?

Ans:Thorny shrubs,cactus are some plants grow in dersert habitat.

3.What is salinity of a water body?

Ans:The salt dissolved in water makes salinity of water.

4.What is an aquatic habitat?

Ans:Water bodies are called aquatic habitat.eg-lake,pond,spring etc.

5.List of the abiotic components of terrestrial habitat?

Ans:Nature of the soil,rainfalls and temperature are important abiotic components

in terrestrial habitat.

6.Mention the types of aquatic habitat?

Ans:Depending upon salinity in water aquatic habitat is of three types.they are

freshwater habitat,marine habitat and estuarine habitat.

7.Mention the types of terrestrial?

Ans:Depending upon rainfalls and temperature,the terrestrial habitat is of three

types.They are forest habitat,grassland habitat and desert habitat.

UNIT-2 BODY ORGANIZATION IN ORGANISMS

I.choose the correct answer.

1.The whale respire through

a.gills b.skin

c.lung d.mouth

2.The body of birds is covered by

a.bony plates b.feathers

3.The word which does not belong to the group

a.teeth b. skin

c.tongue d.ear

4.The flanttened extentions of body in fishes are called

a.tail b.fins

c.gills d.scales

5.The neck is absent in this animal

a.camel b.fish

c.elephant d.lion

6.The reservoir of food in onion plant is

a.root b.stem

c.leaf d.flower

7.The main function of flower is

a.reproduction b.storage of food

c.respiration d.supporting

II.Fill in the blanks.

1.The thick layer of fatty substance beneath the skin of whale is called blubber.

2.The bones of birds are called pneumatic bones.

3.Animal with the back bone are called vertebrates.

4.The orchid plants have absorptive root.

5.The reproduction in rose plant is called vegetative reproduction.

6.The leaves contion chlorophyll which conduct in photosynthesis.

III.Match the following.

1.Pnematic bone-bird 2.Gills-fish

3.Flattened finlike tail-dolphin 4.blubber-whale

5.Thick fur-polar bear

II. 1.Bat-patagium 2.Camel-hoofs

3.Whale-paddles 4.Chameleon-prehensile tail

5.fish-fins

III. 1.fruit-fleshy and edible 2.stem-transportation

3.root-absorption 4.leaves-photosynthesis

5.flower-reproduction

IV.Answer the following.

1.What are pneumatic bones?

Ans:The bones of birds contain air filled hollow spaces.thisis called pneumatic

bones.

2.Mention the Adaptations in dolphin which lives in aquatic habitat?

Ans:Adaptation of dolphin:

a.Stream lined body

b.Forelimbs are modified into paddles.

c.fin like tail fluke is present

d.Hair is absent

e.Smooth body surface.

3.Explain the adaptations in the polar bear?

Ans:Adaptations of polar bear:

a.Covered by a thick fur.

b.Has thick layer of fat under skin

c.Has small round ear

d.Can adjust to drastic cold climatic condition.

4.Draw a neat diagram of a fish and lable the respiratory organ.

Ans:Refer page no-25.

5.Name the unpaired fins in fishes?

Ans:There are three unpaired fins in fishes. They are dorsal fins,ventral fin and

caudal fin.

6.Name the four general Parts of vertebrates?

Ans:The body of vertebrates generally consist of four parts namely

head.thorax,abdomen and tail.

7.What are the function of dorsal fins and ventral fins of fish?

Ans:Dorsal and ventral fins prevent the rolling of fish.

8.Name the supplementary structures of the skin?

Ans:Scales,bony plates ,feather and hair are the supplementary structures of the

skin.

9.Draw a neat diagram of a calotes and lable the parts.

Ans:Refer page no-26

10.What are the normal functions of roots?

Ans:The normal functions of root are-

a.They fix the plant firmly to the soil.

b.Root help to absorb water and salts from the soil.

11.Draw a neat diagram of a flower and lable the parts.

Ans;Refer page no-34 Fig-2.26

12.Draw a neat diagram of a plant and lable the parts.

Ans:Refer page no-29.Fig-2.15.

13.What is the main function of leaf?

Ans: The main function of leaf are-

a. Storage of food

b.Reproduction

c. manufacture of food

III.Underline the words which does not belong to the group.

1.cattle,monkey.fish,man.

2.pigeon,hen,parrot,lion.

3.Elephant,whale,dolphin,fish.

4.Starfish,shark,calotes,whale.

5.Camel,horse,cattle,rabbit.

6.Beetroot,root of rose plant,radish,sweet potato.

7.flower,leaf,photosynthesis,fruit.

8.Reproduction,flower,transportation,photosynthesis.

UNIT-3 ELEMENTS AND COMPOUNDS

I.Choose the correct answer.

1.The liquid filled in thermometer is

a.oil b.bromine

c.mercury d.spirit

2.The chemical symbol used to represent silver is

a.Ag b.Au c.Ar d.Al

3.The chemical symbol of the element having Latin name is

a.Ru b.Np c.Ni d.Fe

4.It is an example for compound

a.carbon b.nitrogen gas c.air d.carbon dioxide

5.The molecular formula of carbon dioxide is

a.CO b.CO2 c.CO d.C2O

6.Potassium permanganate has one atom of potassium one atom of manganese

and four atoms of oxygen .Its formula is

a.KMno b.KMn4O c.K4MnO d.KMnO4.

II. Fill In the blanks.

1.Each substance is made up of an atom.

2.The Greeks used pictures to represent elements.

3.The method of representing elements by symbols was introduced by J.J Berzilius.

4.The Latin name of sodium is Natrium.

5.The element present in nitric acid are nitrogen ,hydrogen and oxygen.

6.The molecular formula for hydrogen molecule is H2.

7.The smallest particle that has all the properties of an element is called molecule.

8.Complete the following :

a.Magnesium+oxygen----------Magnesium oxide.

b.Sodium +Chloride-------------Sodium chloride

III.Match the following.

1.Calcium-Ca 2.Cobalt-Co

3.Carbon-C 4.Copper-Cu

5.Chlorine-Cl.

B.Match the following.

1.Ammonia –NH3 2.Sodium chloride-NaCl

3.Sulphuric acid-H2SO4 4.Water-H2O

5.Carbon dioxide-CO2

IV.Answer the following.

1.What is an atom? Name the three fundamental particles of an atom.

Ans:All substances are made up of small particles called atom.The three

fundamental particles are-proton.neutron and electron.

2.What are element?Give two examples.

Ans;The substance which made up of same kind of atom is called an element.eg-

Oxygen,hydrogen,nitrogen etc.

3.What is a chemical symbol?Write the symbols of the following.

Copper,hydrogen,tungsten,mercury,iron,carbon,aluminium.

Ans:Copper-Cu,hydrogen-H,tungsten-W,mercury-Hg,iron-Fe,carbon-C,aluminium-

Al.

4. write the names of elements having the following symbols.

O,N,P,Mn,Mg,Br,Cl,Si.

Ans:O=Oxygen,N=Nitrogen,P=Potassium,Mn=Maganese,Br=Bromine,Cl=Chlorine,Si

=Silicon.

5.What is compound?Give an examples.

Ans:The substance which is made up of different types of atoms is called a

compound.eg-CO,H2O,CO2etc.

6.What is a molecule?

Ans:Two or more atom is called molecule.

7.How does the atom of an element differ the atom of a compound?

Ans:ELEMENT:

a.The element are made up of the same kind of atoms.

b.Chemical symbols are used to represent element.

c.Eg-O,H,N.Si

COMPOUND:

a.The compounds are made up of the different types of atoms.

b.Molecular formula is used to denote compound.

c.Eg-CO,NH4,CO2,H2O.

8.What is molecular formula ?Write the molecular formula for the following

compound.

Sulphuric acid ,hydrochloric acid,calcium carbonate,carbon di oxide,water.

Ans-Symbolic representation of molecules of element or compounds is called

molecular formula.

Sulphuric acid=H2SO4 ,Hydrochloric acid=HCl ,Calcium carbonate=CaCO3

Carbon -di-oxide=CO2,water=H2O.

9.Classify the following into elements and compounds.

Water, air, lead,sugar,common salt,mercury,helium.

Ans:Water,air,common salt sugar are compounds and lead,mercury,helium are

elements.

10.What are the uses of writing molecular formula?

Ans:The uses of writing molecular formula are:

*The names of the elements and compound can be denoted in short forms which

save time and place while writing.

*Formulas indicates the names of all the elements present in compound.

*The number of atoms present in the compound can be known easily

*The proportion or ratio in which atoms combine can be known.

11.The molecular formulae potassium chlorate and sodium sulphate are KClO3 and

Na2SO4respectively.

a)Name the elements present in these compounds.

Ans:KClO3=potassium,chlorine,oxygen.Na2SO4=sodium,sulphate

b)Write the number of atoms of each element present.

Ans:KClO3=1:1:3 .Na2SO4=2:1:4.

UNIT-4 METALS AND NON- METALS

I.Choose the correct answer.

1.An example for liquid metal is mercury.

2.An example for liquid non metal is bromine.

3.It is a non metal hydrogen.

4.An example for metalloid is germanium.

5.An example for inert gas is helium.

II.Fill in the blanks.

1.metals are good conductor of electricity.

2.The property by which a metal can be drawn into thin sheet is called

Malleability.

3.The property by which a metal can be drawn into thin wire is called ductility.

4.The hardest non metal is diamond.

III.Give reasons for the following.

1.Graphite is not to make wires.

Ans:Graphite does not have ductility property so graphite is not use to make wires.

2.Aluminium foils are used to wrap food items.

Ans:Aluminium is good conductor of electricity so it is use to wrap food items.

3.Bells are made up of metals.

Ans:Metals have sonorous property so matels are use to make bells.

IV.Who am I?

1.I am a metal, I change to salt when I react with chlorine.

Ans:Sodium

2.I am a metal ,I change to rust when I react with oxygen and water.

Ans: Iron.

3.I am a non metal but a good conductor of electricity.

Ans:Graphite.

V.Rearrange the underline letters.

1.I am a soft metal ;potassium

2.I am a good conductor of heat and electricity:Aluminium.

VI.Answer the following.

1.What is a metal? Give two examples.

Ans:The elements which are hard ,lustrous,malleable,ductile,sonorous and good

conductor of heat and electricity are called metals.eg-iron,copper.

2.What are metalloids?Give two example.

Ans:The elements which possess the properties of both metals and non metals are

called metalloids.eg-germenium,boron.

3.What are intre gases?Give two examples?

Ans:The elements which do not combine together to form substances because of

their special nature are called inert gases or noble gases.eg-neon,helium.

4.Write any four properties of metalloids.

Ans:*Metalloids are solid in nature.

*Their conductivity lies in between metals and non metals.

*Generally metalloids are semiconductors.

*All the metalloids have different melting points and boiling points.

5.Write any four properties of inert gases.

Ans:The properties of inert gases :

*Inert gases are colourless and odourless.

*They can be easily liquefied.

*They are soluble in fluids.

*They have very low melting point and boiling point.

6.Write the difference between metals and non metals.

Ans:METALS-

*Metals are generally solids at room temperature.

*Generally metals have a shining surface.

*Metals are generally hard.

*Metals are good conductors of heat and electricity.

*Metals have the properties of malleability and ductility.

*Metals are sonorous.

NON-METALS.

*Non metals exist as solid ,liquid and gases.

*Non metals do not have shining surface.

*Non metals are generally soft.

*Non metals are bad conductor of heat and electricity.

*Non metals do not have properties of malleability and ductility.

*non metals are not sonorous.

UNIT-5 SEPARATION OF SUBSTANCES FROM MIXTURES

I.Choose the correct answer.

1.A mixture among the following air.

2.Which of the following is not a purpose of separating substances to to know the

contents of mixture.

3.Raju mixed mustard with rice flour.The appropriate method that you suggest to

him to separate these two is sieving.

4.Anitha is trying to separate sugar dissolved in water.The method she can use is

evaporation.

5.The substance which does not sublimate is ice.

II,Fill in the blanks.

1.melting point of ice is o0c.

2.Rice is separated from its stalks by threshing.

3.The method of used to obtain to salt from sea water is evaporation.

4.When you heat naphthalene it changes from solid state to gaseous state.

5.Separating substances by breeze or wind is called winnowing.

III.match the following.

1.sulphur and iron fillings=magnetic separation.

2.Water and sand=filtration

3.Salt and water=evaporation

4.Bananas and chillies=hand picking.

5.Naphthalene and salt=sublimation.

IV.Answer the following.

1.Why do we separate different substances of a mixture?give two example from

your daily life.

Ans:We separate different substances of mixture because to separate useful and

non useful substances.eg-rice,wheat.

2.List out the methods of separating substances of a mixture.

Ans:Hand picking,threshing,winnowing,sieving,sedimationand decatation,filtration

evaporation,sublimation,magnetic separation and separating funnel method are

some of simple methods of separating substances of a mixture.

3.What is threashing?Where is it used.

Ans;The farmers beat the stalks on a hard surface.As a result the grains will be

separated.this method of separation is called threashing.eg-wheat,ragi.

4.What is winnowing?Where do people use this method.

Ans:The component of mixture are separated by wind or by blowing air .This

method of separation of substances is called winnowing.winnowing is the common

method used by farmers.

5.Anitha’s mother mixed jeera with wheat flour,Suggest the suitable method of

separation.

Ans:They can use sieving mehod to separate mixture.

6.The tap water at Anil’s house is muddy. By which method can he get clear

water?

Ans:He can get clear water by decantation.

7.How is common salt obtained by sea water?

Ans:Common salt is obtained from sea water by using the method of

evaporation.sea water is collccted in shallow pits and allowed to evaporate by

sunlight.After some days solid is left behind in the pit.

8.You are given a mixture of camphor and sand?How do you separate these two?

Ans:Sublimation is a method used to separate camphor and sand.

9.What is Sublimation?Give two examples

Ans:Sublimation is the process in which a solid is directly converted into

vapour.eg-Iodine,camphor.

10.you are given some rice mixed with a lot of husk. How will you Separate these

two?

Ans :mixture of rice and husk can be separated by winnowing.

11.Sushma is trying to separate oil from water.Which method can she use?

Ans:She can use separating funnel method to separate oil from water.

UNIT-6 CONDUCTORS AND INSULATORS

I.Choose the correct answer.

1.Conductors carry electricity.

2.A conductor among these is copper.

3.An insulator among these is dry wood

4.The most commonly used conductor is copper

5.An example for semiconductor is silicon.

II. Fill in the blanks.

1.The plastic or rubber coating on a conductor is called insulator.

2.Germanium is an example for semiconductor.

3.Air is an insulator.

III.Give reasons.

1.Wires is used to electrical connections are covered with plastic.

Ans: .Wires is used to electrical connections are covered with plastic because

plastic is an insulator it prevent to get electric shock.

2.An electrician wears rubber slippers while working.

Ans:Rubber slippers are insulator they do not allow electricity to flow through

them so an electrician wears rubber slippers while working.

3.Insulation is a must for all electrical appliances.

Ans:If we touch the metal parts of electrical appliances .When they are switched

on,we get shock so Insulation is a must for all electrical appliances.

IV.Answer the following.

1.What is current electricity ?Mention some sources of electricity.

Ans:The electricity that flows through wires is called current

electricity.Cell,battery,generators are some sources of electricity.

2.Distinguish conductors from insulators.

Ans:CONDUCTORS:

*Conductor allow electricity to flow through them.

*All metals are conductors.

*Copper,aluminium,iron are some example for conductors.

INSULATORS:

*Insulators are do not allow electricity to flow through them.

*Rubber,plastic,glass,dry wood are some example for insulators.

3.Give four examples for conductors.

Ans:Copper, aluminium,iron and steel are example for conductors.

4.Give four examples for insulators.

Ans:Rubber,plastic,glass,dry wood and ceramic are example for insulators.

5.Raju says electricity is of no use without conductors.Do you agree with

him?Justify your answer.

Ans:Yes because electricity flow through only in conductors so electricity is of no

use without conductors.

6.Susham is doing a project on conductors and insulators.Help her to classify the

following into conductors and insulators.

Stone,gold chain,cycle key,iron pipe,glass piece,rubber band,woollen

thread,plastic pen cap,one rupee coin.

Ans: *Stone,glass piece,rubber band, woolen thread,plastic pen cap are example

for insulators.

*Gold chain,cycle key,iron pipe,one rupee coin are examples for conductors

STD-VI MEASURING DEVICES UNIT-7

I.Choose the correct answer.

1.The quantity of matter present in a body is its --------------

a)weight b)mass

c)density d)specific gravity

2.Gravity of the earth is -----------------------------

a) 9.8m/s2 b)98m/s2

c)9.8m/s3 c)98m/s3

3. Ramaiah a fruit seller,uses the following device to measure the weight of the

apple.

a) hydrometer b) spring balance

c) physical balance c) common balance.

4.The position of the pointer at zero on physical balance is called---------

a)neutral point b)balancing point

c)zero point c)measuring point

5.The body that floats on water is---------------------------

a)wooden block b)eraser in your geometry box

b)a five rupees coin c)an iron nail

6.According to Archimedes principle a body immersed in water suffers---------------

--------

a)apparent gain of weight b)apparent loss of weight

c)apparent gain of mass d)apparent loss of mass II.Fill in the

blanks

1.The force of gravity on the mass of a body is called gravitation force.

2.Spring balance was invented by Robert Hooke.

3.Density of water is 1000kg/m3.

4.A body sink in water if its density is more then the density of water.

5.The property of water to apply an upward force on a body is called buoyancy.

III.Give reasen for the following.

1. A heavy metal pot becomes lighter when it is immersed completely in water.

Ans-According to Archimedes principle-the apparent loss of weight of a body immersed either

wholly or partially in a liquid is equal to the weight of the displaced liquids.so a heavy metal

pot becomes lighter when it is immersed completely in water.

2. An iron block displace more water than a copper block of the same weight.

Ans-An iron block displace more water than a copper block of same weight,because of differ in

their density.

IV. Answer the following .

1. Distinguish between mass and weight .

Ans –Mass

Mass is the quantity of matter present in a body .It does not change from place to place.

Mass of a body is measured by a device called common balance.

S.I unit of mass is kg.

Weight-

Weight is the gravitational force acting on the mass of a body.

Weight of a body varies slightly from place.

Weight of a body is measured by a device called spring balance.

S.I unit of weight is newton (N).

2. Anoop is visiting different countries. He is surprised to know that his luggage weight

slightly differs at different places.Why?

Ans - Weight is the force of gravity acting on mass of body. Gravity of Earth varies slightly at

different places. Weight of body also slightly varies. So only Anoop feel that his luggage weight

is slightly differs at different places.

3. Where do you find a physical balance ?How does it work?

Ans- In science laboratories physical balance is used to measure the of chemicals and small

objects.

Working—

The body whose mass is to be determined is placed is the left pan. Weights will be added or

removed in the right pan .when mass in both pans becomes equal, the pointer rests at zero on

the scale. This position is known as balancing point of the physical balance. At this position the

mass in the right pan will be the body place in the left pan .

4. How does a merchant use a common balance?

Ans-Merchant put the known weight in the left pan and on adding grains or vegetables to the

right pan till the balancing point is reached.

5. Rahim wants to measure the weight of his lunch box using a spring balance. Suggest the

step.

Ans- An object whose weight is to be determinded is suspended by the hook. As the gravity of

the earth pulls the object downwords, the spring will be starched.The reading of the pointer

on the scale gives the weight of the suspended object.like this he can measure the weight of

his lunch box using a spring balance.

6. Express the relation between density, volume and mass of body in the form of an

equation.

Ans-Density=mass/volume

7. Mary experimenting on floating and sinking bodies. But she cannot make out why some

object sink and some float. Help her by considering the density of a body and that of

water.

Ans-a) If the density of the body is more than the density of water, it sink.

b) If the density of the body is less than the density of water, it float.Based on this

properties she can differentiate floating and sinkng bodies.

8. State Archimedes principle.

Ans-The apparent loss of weight of a body immersed either wholly or in a liquid is equal to the

weight of the displaced liquid.

8. Why does a ship made up of iron float on water?

Ans-The metal foil which is present in ship is in the form of tray is wider. Here the effect of

buoyant force acting on its area is more.So ship made up of iron float on water.

9. How do you find the density of water using a hydrometer?

Ans- Hydrometer is dipped in water. It tilts and comes to rest .The reading of water level on

the scale gives density of water.

Density of water is 1000kg/m3

10. Mention any two uses of Archemides principle?

Ans-1) It is used to find the density of water.

2) It is used to find specific gravity of liquids.

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