Page 57 - Viva ICSE Science 4 : E-book
P. 57

•   Trees growing in plains with less rainfall shed their leaves
                        in autumn and bear new leaves in spring.  These trees

                        are called deciduous trees. Sheesham and teak are some
                        deciduous trees.



                                                                                                 Teak, a deciduous tree

                                                •    Trees growing in plains with heavy rainfall do not shed their

                                                     leaves. Instead, these trees keep replacing their old leaves
                                                     with newer ones and appear green throughout the year.
                                                     These trees are called  evergreen trees. Mango, bamboo

                                                     and ashoka trees are some evergreen trees.

                                                •    Plants found in plains have many branches and leaves.
                    Mango, an evergreen tree


                    Plants growing in deserts

                    Deserts are very large areas of land that receive very less rainfall. The soil in desert is
                    sandy. Plants growing in deserts are adapted to survive in the presence of least amount

                    of water. They have the following adaptations to survive in deserts.
                    •   Leaves are modifi ed into spines and thorns to prevent loss

                        of water.
                    •   Stems of these plants are green, and thus, perform
                        photosynthesis.  They also store food and water for the

                        plant.
                    •   Cactus, date palm and aloe vera are some examples of

                        desert plants.                                                           Cactus, a desert plant


                    Plants growing on hills

                    Hills or mountains are the higher areas of land. They are colder
                    than plains. Snowfall usually occurs in winters on mountains.

                    Trees growing in these areas adapt to live in cold conditions
                    and show the following adaptations.

                    •   Trees have thick barks. They are usually tall, straight and
                        cone-shaped. This allows snow to slide off  their branches

                        easily.                                                                   Trees on mountains


                                                                                                                       43
   52   53   54   55   56   57   58   59   60   61   62