Page 86 - Science Class 08
P. 86

Ecosystem        :  A  biological  community  of  interacting  organisms  and  their  physical
                                    environment
               Evaporate        :  To cause a liquid to change to a gas

               Deforestation  :  The action of clearing a wide area of trees


               Let's R
               Let's R
               Let's R
               Let's R
               Let's Revise evise Let's Revise evise evise Let's Revise evise
                i In India, the total area under forest cover is 65.75 million hectares out of the total land area
                    of 328 million hectares.
                i In percentage, India has only 22.74 percent of land area under forest cover.
                i A country should have at least 30% of land area under forest cover.
                i Forests provide habit for a member of flora and fauna.

                i Forests maintain biodiversity, groundwater level, air humidity and prevent soil erosion.
                i Forests provide so many raw materials used in industries to manufacture various things.
                i Cutting down of forest trees excessively for commercial use is called deforestation.

                i Important causes for deforestation are procuring land for cultivation, construction of roads,
                    railway tracks and dams and making furniture or using wood as fuel.
                i Major consequences of deforestation are less of habitat, drought, desertification and floods.
                i We can conserve forests by planned harvesting of forestation, providing protection against
                    fire, protecting from overgrazing and protecting from insects and pests.
                i Biosphere reserves are the areas meant for conservation of biodiversity.
                i Our  government  has  set  up  wildlife  sanctuaries,  national  parks  and  tiger  reserves  for
                    protecting wildlife.

                i Endemic species of plants and animals are found in particular regions of the earth.
                i International  Union  of  Conservation  of  Nature  (IUCN)  has  issued  various  record  books  in
                    which it maintains the record of all the threatened animals and plants.


                                                         Ex
                                                         Ex
                                                         Exercise
                                                         Ex
                                                         Exerciseerciseerciseerciseerciseercise
                                                         Ex
                                                         Ex
              A.   Tick (3) the correct op on.
                  1.  How much percent of India’s total land area is under forest cover?
                      (a)  10.12 %                                    (b)  22.74%
                      (c)   32.14%                                    (d)  54.76%
                  2.  Which of the following is not a func on of forest?
                      (a)  Maintaining biodiversity                   (b)  Preven ng soil erosion

                      (c)   Maintaining air humidity                  (d)  Preven ng water pollu on
                  3.  Due to deforesta on, the level of groundwater:
                      (a)  remains the same                           (b)  goes down

                      (c)   goes up                                   (d)  none of these

               86                                                                                           Science-8
   81   82   83   84   85   86   87   88   89   90   91