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Solutions ⇒ Class 9th ⇒ Science ⇒ 14. Natural Resources

Solutions 14. Natural Resources - Chapter Review | Class 9 Science - Toppers Study

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Solutions 14. Natural Resources - Chapter Review | Class 9 Science - Toppers Study

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Chapter 14 Science class 9

Chapter Review class 9 Science Chapter 14. Natural Resources

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  • Solutions 14. Natural Resources - Chapter Review | Class 9 Science - Toppers Study
  • Class 9 Ncert Solutions
  • Solution Chapter 14. Natural Resources Class 9
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  • Chapter 14. Natural Resources Chapter Review Class 9

14. Natural Resources

| Chapter Review |

Solutions 14. Natural Resources - Chapter Review | Class 9 Science - Toppers Study


Chapter-Review

 

  • Life on Earth depends on resources like soil, water and air, and energy from the Sun.
  • We need to conserve our natural resources and use them in a
    sustainable manner.
  • Water covers 75% of the Earth’s surface.
  • The air that covers the whole of the Earth like a blanket, is called
    the atmosphere.
  • This life-supporting zone of the Earth where the atmosphere, the hydrosphere and the lithosphere interact and make life possible, is known as the biosphere.
  • Living things constitute the biotic component of the biosphere.
  • The air, the water and the soil form the non-living or abiotic component of the biosphere.
  • Air is a mixture of many gases like nitrogen, oxygen, carbon dioxide and water vapour.
  • Carbon dioxide constitutes up to 95-97% of the atmosphere on Venus and Mars.
  • Eukaryotic cells and many prokaryotic cells need oxygen to break down glucose molecules and get energy for their activities.
  • The process which results in the consumption of oxygen and the concomitant production of carbon dioxide is combustion.
  • Carbon dioxide is ‘fixed’ in two ways: (i) Green plants convert carbon
    dioxide into glucose in the presence of Sunlight and (ii) many marine animals use carbonates dissolved in sea-water to make their shells.
  • Air is a bad conductor of heat.
  • The atmosphere keeps the average temperature of the Earth fairly steady during the day and even during the course of the whole year.
  • During the night, atmosphere slows down the escape of heat into
    outer space.
  • The surface of moon has the temperature ranges from -119 C to 110 C due to no atmosphere. 
  • Uneven heating of air over land and water-bodies causes winds.
  • Evaporation of water from water-bodies and subsequent condensation give us rain.
  • Water vapour is formed due to the heating of water bodies and the activities of living organisms.
  • The atmosphere can be heated from below by the radiation that is
    reflected back or re-radiated by the land or water bodies. On being heated, convection currents are set up in the air.
  • Rainfall patterns are decided by the prevailing wind patterns.
  • The hot air rises up carrying the water vapour with it.
  • The fossil fuels like coal and petroleum contain small amounts of nitrogen and sulphur.
  • On burning fossil fuels produces different oxides of nitrogen and sulpher. 
  • Oxides of sulpher and nitrogen dissolve in rain to give rise to acid rain.
  • The combustion of fossil fuels also increases the amount of suspended particles in air. These suspended particles could be unburnt carbon particles or substances called hydrocarbons.
  • Presence of hight levels of pollutants in fog cause visibility to be lowered, this is known as smog. This indicates air pollution. 
  • An increase in the content of harmful substances in air is called air
    pollution
    .
  • Water occupies a very large area of the Earth’s surface and is also found underground.
  • Most of the water on Earth’s surface is found in seas and oceans
    and is saline.
  • Fresh water is found frozen in the ice-caps at the two poles and on snowcovered mountains. The underground water and the water in rivers, lakes and ponds is also fresh.
  • All cellular processes take place in a water medium.
  • All the reactions that take place within our body and within the cells occur between substances that are dissolved in water.
  • Substances are also transported from one part of the body to the other in a dissolved form.
  • organisms need to maintain the level of water within their bodies in order to stay alive.
  • Terrestrial life-forms require fresh water for  because their bodies cannot tolerate or get rid of the high amounts of dissolved salts in saline water.
  • The quality of the topsoil is an important factor that decides
    biodiversity in that area.
  • The sun, water, wind and some living organism like Lichen help in formation of soil.
  • Removal of surfaces of soil by water and wind is known as soil erosion.  
  • The upper most layer of earth contains bits of decayed living organisms which is called humus.
  •  Humus is a major factor in deciding the soil structure because it causes the soil to become more porous and allows water and air to penetrate deep underground.
  • The mineral nutrients that are found in a particular soil depends on the
    rocks it was formed from.
  • The topmost layer of the soil that contains humus and living organisms in addition to the soil particles is called the topsoil.
  • The quality of the topsoil is an important factor that decides biodiversity in that area.
  • Use of large amounts of fertilizers and pesticides over long periods of time can destroy the soil structure by killing the soil micro-organisms that recycle nutrients in the soil.
  • The roots of plants have an important role in preventing soil erosion.
  • The water-cycle, the nitrogen-cycle, the carbon-cycle, the oxygen-cycle are parts of biogeochemical cycles. 
  • Nitrogen gas makes up 78% of our atmosphere and nitrogen is also a part of many molecules essential to life like proteins, nucleic acids (DNA and RNA) and some vitamins.
  • Nitrogen-fixing bacteria fixes atmospheric nitrogen to ntrates and nitrites. 
  • Plants generally take up nitrates and nitrites and convert them into amino acids which are used to make proteins.
  • All life-forms are based on carbon-containing molecules like proteins, carbohydrates, fats, nucleic acids and vitamins.
  • The endoskeletons and exoskeletons of various animals are also
    formed from carbonate salts.
  • The process of photosynthesis converts carbon dioxide from the atmosphere or dissolved in water into glucose molecules.

 

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Study Materials List:

Solutions ⇒ Class 9th ⇒ Science
1. Matter in Our Surroundings
2. Is Matter around us Pure
3. Atoms and Molecules
4. Structure of The Atom
5. The Fundamental Unit of Life
6. Tissues
7. Diversity in Living Organisms
8. Motion
9. Force and Laws of Motion
10. Gravitation
11. Work and Energy
12. Sound
13. Why Do We Fall ill
14. Natural Resources
15. Improvement in Food Resources

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