Notes For Class 10 Science Biology Chapter 16 Management of Natural Resources Download pdf. CBSE class 10 Science Chapter 16 Management of Natural Resources notes in PDF are available for free download in myCBSEguide mobile. Free PDF download of Class 10 Science Chapter 16 - Management of Natural Resources Revision Notes & Short Key-notes prepared by expert Science teachers from latest edition of CBSE(NCERT) books. To register Science Tuitions on aracer.mobi to clear your doubts. Study Materials for.
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Management of. Natural Resources. CHAPTER. We learnt in Class IX, about some natural resources like soil, air and water and how various components. CLASS X. SUSTAINABLE MANAGEMENT OF NATURAL RESOURCES. Environmental awareness and its importance. Awareness about the problems caused. Download as PDF, TXT or read online from Scribd. Flag for Chapter Management of natural resources. Chapter Notes . Life Processes - CBSE Class 10 Biology. Uploaded by 10 Science Notes 08 How Do Organisms Reproduce 1.
The main aim of forest conservation is to preserve the biodiversity we have inherited. Stakeholders: Those persons, who are directly or indirectly involved in using the produce of forests or are interested in the conservation of forests, are called stakeholders.
Hotspot: means an area full of biological diversity. Sustainable management: Management of forest resources wisely to make it available for future generations. Sustainable development is development encourages the judicious use of natural resources to meet the current basic human needs, while preserving the resources for the needs of future generations. Water as a Resource: Water is a basic necessity for all terrestrial forms of life. Regions of water scarcity are closely correlated to the regions of acute poverty.
Failure to sustain water availability has resulted in the loss of vegetation cover, diversion for high water demanding crops and pollution from industries and urban wastes and less rain. Irrigation methods like dams, tanks and coals have been used in various part of India. Dams: In order to make proper use of river water, dams are constructed across the rivers to regulate the flow of water. A dam has a large reservoir to store huge amounts of water.
This stored water is then allowed to flow downstream at the desired rate. Water from a dam is used for irrigation in fields through a network of canals. Dams ensure round the year water supply to the crop fields and help raise agricultural production. The water rushing down the dam turns turbines which run electric generators to generate electricity.
Construction of large dams addresses three problems in particular- Social problem. A large number of local people have to be displaced which includes farmers and tribals without their adequate compensation or rehabilitation. Economic problem. As dams are built up with huge amounts of public money without the generation of proportionate benefits.
Because the making of large dams contributes enormously to deforestation and the loss of biological diversity. Water Harvesting: Collecting rainwater for use in future by storing it in storage reservoirs is called rainwater harvesting.
Various ancient methods of water harvesting. These techniques are locale specific to ensure the mismanagement and over-exploitation of these resources.
Advantages of Khadin System Recharge wells and moisture for vegetation. Does not provide a breeding ground for mosquito Groundwater is protected from human and animal waste. Green House Effect: When the reflected back infra-red rays of longer wave-length of the Sun are entrapped by C02 gas of atmosphere, the atmosphere gets warmed. A coliform is a group of bacteria, found in human intestines, whose presence in water indicates contamination by disease-causing microorganisms.
The main aim of this project is to improve the water quality of Our holy river Ganga. The water of the river Ganga gets polluted because of the following reasons : Dumping of untreated sewage. Human activities like bathing or washing of clothes. Immersion of ashes or unburnt corpses.
Chemical effluents from industries. This all pollutes water, increasing the toxicity level which kills fish in large sections of the river.
One can help by switching off unnecessary lights and fans, repairing leaky taps, preventing wastage of food.
Recycling: It minimises the faster depletion of natural resources. Reuse: It is better than recycling because the process of recycling uses some energy. Economic development is linked to environmental conservation. The concept of sustainable development encourages forms of growth that meet current basic human needs, while preserving the resources for the needs of future generation.
The sustainable development : It implies a change in all aspects of life. To cope with the growing demand, there has been rapid development of ground water supply. But increasing demand, especially in urban areas, has led to depletion of ground water and associated problems. With growing human population, the gap between demand and supply of water has widened.
About 85 percent of rural water supply and more than 50 percent of urban and industrial supply is mined.
So ground water is sinking to new depths in most of Delhi, all of Daman and Deu, nearly three-fifth of Punjab, about two-fifth of Haryana and Mehsana area of Gujarat. Hence conserving the surplus water during the monsoons by water harvesting and recharge techiques must be adopted as the water management agenda. Significance of Rain water harvesting : i It reduces run off loss and avoids flooding.
Methods of Rain water harvesting: i Traditional methods : a In high rainfall areas, rainwater from roof tops shown in figure is collected into water storage tanks from where water is diverted to some abandoned well or lifted by using a hand pump.
Water from streams was diverted towards villages called Kulhs. These canals were made down the hillside. A common management of villagers worked with the agreement of all. Two or three managers looking after the Kulhs were paid by the villagers. Water flowing downwards in these Kulhs was first used by the village farthest away from source.
Water from these Kulhs also percolated in the soil and became the source of springs at various points. After the irrigation department took over the charge of such kulhs, the following changes were noticed a Most of the kulhs have become defunct. These are more advantageous than surface dams due to minimum loss by evaporation and low chances of contamination.
Main theme of this authority is : "Replete Groundwater Before it Depletes" According to its authority, Rain water harvesting is the only option for the 21st Millennium. It has successfully completed the artificial recharge experiments in the following areas resulting in the rise in water level: 1.
Mehsana Project Gujarat : Water level increased from 1. Amaravati Project Maharashtra : Rise in water level by 3 metres through percolation tanks. Kolar Project Kerala : Rise of metres of ground water level through watershed management. Watershed management Characteristics of watershed i It is an area of high land from where water flows under gravity into river or sea. Watersheds supply water for irrigation, hydro-power generation, transportation, vegetation growth and reducing the chances of floods and droughts.
So watersheds improve the economy of the region. Water harvesting is an age old concept in India like : i Khadins, tanks and nadis in Rajasthan.
Water can be retained throughout the year only in large structures. In most of the structures water depletes within few months after monsoons.
Main aim of storing water should not be to hold the surface water but to recharge the ground water. Ground water is useful in : a It provides soil moisture for plant growth. It is relatively protected from contamination by human and animal waste.
Such fuels are obtained- from underground and sea bed exploratrions. However, due to uncontrolled consumption by the ever increaing population. In the world, such fossil fuels may perish in coming years.
Most of the world's energy requirements are met from petroleum and natural gas. COAL Coal is composed of carbon, oxygen and hydrogen. It is widely used as conventional fossil fuel. It releases enormous heat after burning. Coal is combustible organic rock being used for manufacturing of steel, fertilizers, pesticides, etc.
Before plant material is converted into coal, it forms dark brown organic matter called peat. Lignite is formed after deposition of many layers over peat. Anthracite is the last stage of coal formation. It is the hardest form of coal with maximum carbon content.
Its heat value is double than that of lignite. Coal and petroleum have been formed from bio-mass. They contain carbon, hydrogen, nitrogen and sulphur.
When burnt, they release CO2, H2O, oxides of nitrogen and oxides of sulphur. In presence of less oxygen, carbon monoxide is released instead of CO2. Oxides of sulphur and nitrogen and CO2 at high concentration a green house gas is poisonous. Increase in CO2 concentration in atmosphere will lead to global warming. Types of Coal We have learnt that coal is formed by the carbonisation of remains of plants and animals.
Depending upon the extent of carbonisation, we get different varieties of coal. These different varieties of coal have different carbon content. Since the fuel value of coal depends upon the carbon content, Peat is an inferior variety of coal while anthracite is a superior type of coal. The important uses of coal are : 1. Coal is used as a fuel. It can be converted into other useful forms of energy like, coal gas, electricity and oil.
Coal is used in the manufacture of synthetic petrol and synthetic natural gas. Coal is used to manufacture many organic compounds like benzene, toluene, phenol, aniline, naphthalene, anthrancene, etc.
Coal is used as reducing agent in industries in the extraction of metals. Coal is used to make coke. Petroleum World's crude oil reserves are expected to remain up to only 40 years. Crude oil is purified and refined by fractional distillation. Several products like petrol, diesel, kerosine, lubricating oil, plastic are obtained during this process.
Advantages of petroleum : 1. Cleaner fuel as compared to coal. It is easier to transport. The proven reserves for natural gas as on April works out to be approx. Because of this and because their combustion pollutes our environment, we need to use these resources judiciously.
Rain is a very important source of water. Water-harvesting techniques used depend on the location where it is to be used. We are not responsible for any type of mistake in data.
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