RAJESH NAYAK IMPORTANT CHAPTERS FROM SOCIAL SCIENCE AND SCIENCE (FROM NCERT CLASS 10 TH ) CONTENTS NCERT CLASS-X-SOCIAL SCIENCE, CONTEMPORARY INDIA-CHAPTERS-2, 3, 4 & 5 NCERT CLASS-X-SCIENCE-CHAPTERS-14 TH , 15 TH & 16 th
RAJESH NAYAK NCERT CLASS-X-SOCIAL SCIENCE, CONTEMPORARY INDIA CHAPTER-2-FOREST AND WILDLIFE RESOURCES Lepcha folk song from northern part of West Bengal ‗critical‘, that is on the verge of extinction like the cheetah, pink-headed duck, mountain quail, forest spotted owlet, and plants like madhuca insignis(a wild variety of mahua) and hubbardia heptaneuron,(a species of grass). Based on the International Union for Conservation of Nature and Natural Resources (IUCN), we can classify as follows – Normal Species : Species whose population levels are considered to be normal for their survival, such as cattle, sal, pine, rodents, etc. Endangered Species : species which are in danger of extinction. The survival of such species is difficult if the negative factors that have led to a decline in their population continue to operate. The examples of such species are black buck, crocodile, Indian wild ass, Indian rhino, lion tailed macaque, sangai (brow anter deer in Manipur), etc. Vulnerable Species : species whose population has declined to levels from where it is likely to move into the endangered category in the near future if the negative factors continue to operate. The examples of such species are blue sheep, Asiatic elephant, Gangetic dolphin, etc. Rare Species : Species with small population may move into the endangered or vulnerable category if the negative factors affecting them continue to operate. The examples of such species are the Himalayan brown bear, wild Asiatic buffalo, desert fox and hornbill, etc. Endemic Species : species which are only found in some particular areas usually isolated by natural or geographical barriers. Examples of such species are the Andaman teal, Nicobar pigeon, Andaman wild pig, mithun in Arunchal Pradesh. Extinct Species : species which are not found after searches of known or likely areas where they may occur. A species may be extinct from a local area, region, country, continent or the entire earth. Examples of such species are the Asiatic cheetah, pink head duck. Narmada Sagar Project in Madhya Pradesh. The Buxa Tiger Reserve in West Bengal is seriously threatened by the ongoing dolomite mining. The Himalayan Yew (Taxus wallachiana )
RAJESH NAYAK a medicinal plant found in various parts of Himachal Pradesh and Arunachal Pradesh. A chemical compound called ‗taxol‘ is extracted from the bark, needles, twigs and roots of this tree, and it has been successfully used to treat some cancers – the drug is now the biggest selling anti-cancer drug in the world.
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