LESSON 3

Q1 a) DEFINE ENVIRONMENT.


      b)STATE THE SIGNIFICANCE OF THE FOLLOWING COMPONENTS OF THE
          ENVIRONMENT :
          i)ABIOTIC                                         ii)BIOTIC

      c)GIVE THREE EXAMPLES OF EACH :

          i)ABIOTIC COMPONENT               ii)BIOTIC COMPONENT

Q2  EXPLAIN BRIEFLY THE ROLE OF THE FOLLOWING IN SUSTAINING LIFE ON EARTH :

     i) LITHOSPHERE                  ii)HYDROSPHERE                     iii) ATMOSPHERE


Q3  GIVE ONE WORD FOR EACH OF THE FOLLOWING :


     i)  THE LIVING PART OF THE PLANET.


     ii) A DISTINCT AREA IN THE BIOSPHERE WHICH CONTAINS LIVING THING

 
    iii) THE LARGEST RECOGNISABLE TERRESTRIAL UNIT OF THE BIOSPHERE.


   iv)THE NATURAL HOME OF A GROUP OF PLANTS  AND ANIMALS.


   v) THE STUDY OF LIVING THINGS IN THEIR NATURAL SURROUNDINGS.

ENVIRONMENTAL BALANCE

                            ENVIRONMENTAL BALANCE





Q 1    FILL IN THE BLANKS BY SELECTING THE CORRECT ALTERNATIVE FROM THE
         BRACKETS
                                                                                                                                                                     (LAND, AIR, WATER, ACID, ABIOTIC, ICE, COAL, GLOBAL, OZONE, CONSERVATION, CATALYTIC CONVERTER,  HARVESTING , BURNING, )

1  ....................... POLLUTION CAUSES BREATHING PROBLEMS.

2. BURNING OF FUEL AND CUTTING DOWN TREES INCREASES THE GAS          ........................................... IN THE AIR.THIS MAY LEAD TO .......................... WARMING,  WHICH MAY CAUSE MELTING OF ...................... NEAR THE POLES. AS A RESULT, THE LEVELS  OF ..................... IN THE OCEANS MAY INCREASE AND ......................... NEAR THE  OCEANS MAY GET SUBMERGED IN WATER.

3. HARMFUL GASES GIVEN OUT IN .................................. PLANTS, WHERE ELETRICITY IS    MADE BY BURNING ........................... , MIXES WITH WATER DROPS IN THE CLOUDS. THIS CAN RESULT IN ........................ RAIN.

4. THE GAS ......................................... PRESENT IN THE UPPER ATMOSPHERE PROTECTS  US FROM HARMFUL RAYS OF THE SUN BY ABSORBING THEM .....................................    POLLUTION IS REMOVING THIS GAS FROM THE ATMOSPHERE.

5. DRINKING WATER POLLUTED BY SEWAGE CAN CAUSE DANGEROUS DISEASES  SUCH AS ................................... OR .......................................

6. POISONOUS CHEMICALS RELEASED IN WATER FROM ................................. AFFECTS  FISH AND WATER ANIMALS AND PLANTS. WE CAN FALL ILL IF WE EAT THEM.

7. SUBSTANCE SUCH AS PLASTIC IN GARBAGE DO NOT ROT. THEY PERMANENTLY  STAY IN THE SOIL  AND POLLUTE IT. SUCH SUBSTANCES ARE KNOWN AS NON  ........................................... SUBSTANCES.

8. AIR,WATER AND SOIL ARE ....................................... RESOURCES.

9. PROTECTING SOIL FROM EROSION AND POLLUTION IS CALLED SOIL ....................................................

10.WATER .......................................... IS A METHOD OF CONSERVING GROUNDWATER.

                                                                                                                                         

EARTH & ITS LIVING WORLD

 Q1  FILL IN THE BLANKS
1) A VAST  STRETCH OF LAND IS CALLED A  ---------------..
2)  ---------WATER IS SALTY.
3) THE LAND ALONG THE MARGINS  OF THE OCEAN IS CALLED THE ---------REGION
4)  HUGE BLOCK OF ICE FLOATING IN THE SEA ARE CALLED  ---------.
5)  OZONE LAYER ABSORB THE HARMFUL ----------RAYS OF THE SUN.


Q2  CHOOSE THE CORRECT OPTIONS FROM THE  BRACKET .

1) ZEBRAS ARE FOUND IN  --------------(AMERICA , AUSTRALIA , AFRICA).

2) A CASCADING RIVER IS CALLED A  ---------(TRIBUTARY ,RIVERLET, WATERFALL)

3)WEATHER RELATED PHENOMENA ARE SEEN IN THE  -------- OF THE ATMOSPHERE
    (IONOSPHERE , TROPOSPHERE, STRATOSPHERE )

4) ROCKS FORM A PART OF THE ---------------(HYDROSPHERE , LITHOSPHERE,ATMOSPHERE )
 
5)-----------IS THE LARGEST CONTINENT .(AFRICA , ASIA EUROPE )

Q3) MATCH  THE COLUMNS

                        A                                                      B

1)  CLIFF                                                      a)  RIVERS

2)  ATLANTIC                                              b)  ICE

3)  TRIBUTARY                                            c) GROUND WATER

4)  LAYERS OF SNOW                                d)  OCEAN

5)  WELL                                                       e)  LANDFORM

Q4 ) WATER CYCLE