RAJESH NAYAK IMPORTANT CHAPTERS FROM SOCIAL SCIENCE AND SCIENCE (FROM NCERT CLASS 9 TH ) CONTENTS NCERT CLASS-IX-SOCIAL SCIENCE, CONTEMPORARY INDIA-CHAPTER-5 NCERT CLASS-IX-SCIENCE-CHAPTERS-14 TH & 15 TH
RAJESH NAYAK NCERT-CLASS-IX-SOCIAL SCIENCE-CONTEMPORART INDIA CHAPTER-5-NATURAL VEGETATION AND WILDLIFE refers to a plant community which has grown naturally without human aid and has been left undisturbed by humans for a long time termed as a virgin vegetation. cultivated crops and fruits, orchards form part of vegetation but not natural vegetation. The virgin vegetation, which are purely Indian are known as endemic or indigenous species but those which have come from outside India are termed as exotic plants. The term flora is used to denote plants of a particular region or period. the species of animals are referred to as fauna. The sandy soils of the desert support cactus and thorny bushes while wet, marshy, deltaic soils support mangroves and deltaic vegetation. Why are the southern slopes in Himalayan region covered with thick vegetation cover as compared to northern slopes of the same hills? Answer-The growth of vegetation depends upon the amount of sunlight and rainfall received. The southern slopes of the Himalaya receives more rain due to south west monsoon winds which travel west along the southern slops. The northern slopes do not receive any such rainfall. All the plants and animals in an area are interdependent and interrelated to each other in their physical environment forming an ecosystem. TYPES OF VEGETATION The following major types of vegetation may be identified in our country (i) Tropical Ever green Forests (ii) Tropical Deciduous Forests (iii) Tropical Thorn Forests and Scrubs (iv) Montane Forests (v) Mangrove Forests Tropical Evergreen Forests restricted to heavy rainfall best in areas having more than 200 cm of rainfall with a short dry season. trees reach great heights up to 60 metres or even above. region is warm and wet throughout the year, it has a luxuriant vegetation of all kinds – trees, shrubs, and creepers giving it a multilayered structure. no definite time for trees to shed their leaves. appear green all the year round. Some of the commercially important trees of this forest are ebony, mahogany, rosewood, rubber and cinchona. common animals found in these forests are elephants, monkey, lemur and deer. The one horned rhinoceros are found in the jungles of Assam and West Bengal. Besides these animals plenty of birds, bats, sloth, scorpions and snails are also found in these jungles. Tropical Deciduous Forests most widespread forests of India. also called the monsoon forests and spread over the region receiving rainfall between 200 cm and 70 cm.
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