NCERT Solutions for Class 9 Science Chapter 14 Natural Resources
|1. Exercise Questions|
NCERT Solutions for Class 9 Science Chapter 14 Natural Resources on this step-by-step Natural Resources answer guide. In some of State Boards and CBSE schools, students are taught thru NCERT books. As the chapter comes to an end, students are requested few questions in an exercising to evaluate their knowledge of the chapter. Students regularly want guidance dealing with those NCERT Solutions for Class 9 Science Chapter 14: Natural Resources.
It’s most effective natural to get stuck withinside the exercises while solving them so that you could assist students rating better marks, we have provided grade by grade NCERT answers for all exercises of Class 9 Science Natural Resources so you can be searching for assist from them. Students have to solve those exercises carefully as questions withinside the very last exams are requested from those so these exercises at once have an impact on students’ final score. Find all NCERT Solutions for Class nine Science Natural Resources below and prepare for your tests easily.
NCERT Solutions for Class 9 Science
Chapter 14: Natural Resources
Q. 1 . Why is the atmosphere essential for life ?
Ans . Atmosphere is essential for life because of the following reasons :
( i ) It acts as protective blanket for the Earth and absorbs most of the harmful ultraviolet ( UV ) radiations coming from the Sun. Thereby it maintains the temperature of the Earth which helps in the climate control and allows the living organisms to exist .
( ii ) It contains all the essential gases which are important for sustaining life on the Earth .
( iii ) Oxygen , which is required for the survival of every living organism , is present in the atmosphere .
( iv ) Ozone layer present in the atmosphere prevents harmful UV rays from reaching the earth .
( v ) Winds are generated due to the movement of air present in the atmosphere , and rain and rainfall patterns are decided by these winds . Moreover , water cycle is not possible without atmosphere .
Q. 2 . Why is water essential for life ?
Ans . Water is the most essential component for the sustenance of life .
( i ) It acts as a universal solvent , thus providing a medium for many chemical reactions to take place within the body .
( ii ) It also helps in transporting essential molecules or other substances from one part of the body to the other part in a dissolved state .
( iii ) It is also required for many other purposes like drinking , cooking , cleaning , crop irrigation , generation of hydro – electricity , industrial needs , etc.
Q.3 . How are living organisms dependent on the soil ? Are organisms that live in water totally independent of soil as a resource ?
Ans . ( i ) All living organism are dependent on the soil . Some organisms depend directly or some depends indirectly . Like ,
( a ) Plants make their food by absorbing essential nutrients and water from the soil through photosynthesis ; on the other hand , heterotropic organisms ( e.g. , animals ) depend on plants for food and other sub stances which are essential for their life .
( b ) It provides a natural habitat for various organisms like bacteria , fungi , etc. , which in turn maintain the fertility of soil by improving its quality .
( c ) It also provides essential nutrients and anchorage to the plants for their proper growth and development .
( ii ) Organisms that live in water are not totally independent of soil as a resource , because
( a ) these organisms depend on aquatic plants for their support and food .
( b ) some microbes living in water act as the primary producer and start the food chain whereas the other microbes living in soil help in the decomposition of dead plants and animals in water to return the nutrients back to the water for the sustenance of the aquatic plants .
Q. 4. You have seen weather reports on television and in newspapers . How do you think we are able to predict the weather ?
Ans . ( i ) We daily see weather reports on televisions and newspapers . This information is actually . recorded by meteorological departments present in different cities of the country .
( ii ) These departments predict the weather report by collecting the information like direction and speed of wind , average daily minimum and maximum temperature , relative humidity , patterns of cloud formation , depression zone over an area , etc. , with the help of instruments .
Q. 5 . We know that many human activities lead to increasing levels of pollution of the air , water bodies and soil . Do you think that isolating these activities to specific and limited areas would help in reducing pollution ?
Ans . ( i ) Yes , isolating human activities to specific and limited areas would help in reducing pollution of air , water bodies and soil .
( ii ) Examples : Setting up of industries in isolated regions will control pollution to some extent , because pollution caused by these industries will not contaminate water resources , agriculture land , fertile land , etc.
Q. 6. Write a note on how forests influence the quality of our air , soil and water resources .
Ans . Forests influence the quality of air , soil and water resources in the following ways :
( i ) Influence of forests on air :
( a ) Both plants and animals release carbon dioxide to the atmosphere as a product of respiration . Forests use this carbon dioxide for the manufacture of their food by photosynthesis and control the greenhouse effect .
( b ) During photosynthesis oxygen is released into the atmosphere as a by – product . In this way , they are helpful in cleaning the air by adding oxygen into it .
( ii ) Influence of forests on soil :
( a ) It reduces soil erosion . This can be done with the help of deep – rooted plants of forest which is helpful in holding soil particles tightly . It increases the soil fertility .
( b ) As forests are also a component of bio – geochemical cycles , thus help in cycling of nutrients and returning them back to the soil , thus increasing the soil fertility .
( iii ) Influence of forests on water : It increases the water resources of the earth . Forests lose water to the atmosphere through transpiration which is then converted into clouds , water vapours , etc. , which are responsible for causing rain .
Q. 1. How is our atmosphere different from the atmospheres on Venus and Mars ? [ NCERT Q. 1 , Page 193 ]
Ans . ( i ) Our atmosphere , where life is possible , contains gases like nitrogen , oxygen , carbon dioxide , water vapour and other gases in very small amount .
( ii ) Atmosphere of Venus and Mars have about 95 % of carbon dioxide . So , life is not possible .
Q. 2. How does the atmosphere act as a blanket ? [ NCERT Q. 2 , Page 193 ]
Ans . ( i ) Being a bad conductor of heat , the atmosphere keeps the average temperature of the earth fairly constant during the day , even during the course of the whole year .
( ii ) The atmosphere acts as a blanket in the following ways :
( a ) It maintains the temperature on the surface of earth during day and night time .
( b ) contains ozone in the upper layer which protects life from harmful ultraviolet radiation .
Q. 3 . What causes winds ? [ NCERT Q. 3 , Page 193 ]
Ans . ( i ) Wind is the movement of air . It is caused by air flowing from high pressure to low pressure .
( ii ) The uneven heating of the atmosphere in different regions of the earth causes air pressure to differ from place to place .
( iii ) The rotation of Earth and presence of mountain ranges also helps in the formation of wind , its blowing direction .
Q. 4. How are clouds formed ? [ NCERT Q. 4 , Page 193 ]
Ans . ( i ) During daytime water from different sources like pond , lake , river , sea , well , etc. , gets evaporated and this water vapour rises up with the hot air . At a particular height , the air cools and the water vapour condense to form minute droplets and form clouds .
( ii ) When these water drops become heavy , they precipitate and fall down as rain .
Q.5 . List any three human activities that you think would lead to air pollution . [ NCERT Q. 5 , Page 193 ]
Ans . Three human activities which lead to air pollution are given below :
( i ) Excessive use of fossil fuels , that is , coal and petroleum . Because burning of these fossil fuels adds carbon particles to the atmosphere which causes smog . It produces large amount of carbon monoxide and carbon dioxide as well .
( ii ) Use of chlorofluorocarbons ( CFCs ) in refrigeration responsible for depletion of ozone layer .
( iii ) Establishment of a number of industries which release carbon monoxide , sulphur dioxide , oxides of nitrogen , hydrocarbons , heavy metals , etc.
All these are responsible for deterioration of air quality .
Q. 6. Why do organisms need water ? [ NCERT Q. 1 , Page 194 ]
Ans . ( i ) Water is the most essential part of life without which sustenance of life is not possible .
( ii ) Organisms need water for the following activities :
( a ) All cellular processes occur due to water .
( b ) Transportation of substances in our body takes place by dissolving in water .
( c ) Terrestrial animals require fresh water for transportation of minerals and for getting rid of waste from their body .
( d ) Plants require water for photosynthesis .
( e ) It is also required for many other pur poses like drinking , cooking , clean ing , crop irrigation , generation of hydro – electricity , industrial needs , etc.
Q. 7 . What is the major source of fresh water in the city / town / village where you live ? [ NCERT Q. 2 , Page 194 ]
Ans . The major sources of water are :
( i ) Water in the form of snow , ice – covered mountains .
( ii ) Underground water , well and rainfall .
( iii ) Surface water like in lakes , rivers , ponds .
( iv ) Stored rain water in tanks , dams .
Q. 8 . Do you know of any activity which may be polluting the water source ? [ NCERT Q. 3 , Page 194 ]
Ans . Yes , the water is polluted by the following :
( i ) Disposal of garbage or sewage from cities / towns and from factories .
( ii ) Dumping waste in river .
( iii ) Hot water may be released from the industries which may disturb the temperature of water body leading to death of many aquatic organisms .
Q. 9 . How is soil formed ? [ NCERT Q. 1 , Page 196 ]
Ans . Factors that help in the formation of soil are :
( i ) The Sun : Sun heats up rocks during the day so that they expand . At night these rocks cool down and contract , this causes cracks in the rocks .
( ii ) Water : Water during rainfall enters these cracks . If this water freezes , it exerts pressure on the cracks and the rocks break . When water flows , it wears the hard rock and carries small particles of rock downstream .
( iii ) Wind : Strong winds erode rocks down , which rub with each other and small particles are carried away by wind .
( iv ) Living organisms : Like lichen grows on the surface of the rock , they release certain substances that cause the rock surface to powder down and form a thin layer of soil .
Q. 10. What is soil erosion ? [ NCERT Q. 2 , Page 196 ]
Ans . ( i ) The removal of top soil by air , wind and water is called soil erosion . It is washing away of the top soil with flowing water or wind . If all the soils get washed away , the rocks underneath is exposed .
( ii ) It results in land infertility ( by removing its essential resource like humus and living organism ) , and leads to desertification and flooding .
Q. 11 . What are the methods of preventing or reducing soil erosion ? [ NCERT Q.3 , Page 196 ]
Ans . ( i ) Soil erosion is the removal of top soil with flowing water or wind . If all the soil gets washed away , the rocks underneath is exposed which results in the loss of a valuable resource like humus and living organisms present in topsoil . Top soil is the most fertile soil .
( ii ) Methods to reduce soil erosion :
( a ) Soil should have some vegetations like grass growing on it , so that it does not get carried away by rain water or wind .
( b ) Afforestation or planting of trees , so that roots hold the soil and prevent soil erosion .
Q. 12. What are the different states in which water is found during the water cycle ? [ NCERT Q. 1 , Page 201 ]
Ans . Various states in which water is found during the water cycle are :
( i ) Liquid state : It is present in various sources like lakes , rivers and underground water .
( ii ) Gaseous state : It is present in the form of water vapour . Water evaporates from water bodies and by plants in the process of transpiration .
( iii ) Clouds : Condensed water vapour is present in clouds .
( iv ) Water as rain or snowfall .
Q. 13. Name two biologically important compounds . that contain both oxygen and nitrogen . [ NCERT Q. 2 , Page 201 ]
Ans . ( i ) Two biologically important compounds that contain both oxygen and nitrogen are : nitrites ( NO₂– ) and nitrates ( NO3– ) .
( ii ) These are biologically important because plants can absorb nitrogen only in the form of nitrates ( NO3– ) and nitrites ( NO₂– ) .
Q. 14. List any three human activities which would lead to an increase in the carbon dioxide content of air . [ NCERT Q. 3 , Page 201 ]
Ans . Human activities , which are responsible for adding carbon dioxide to the atmosphere , are given below :
( i ) Burning of fossil fuels like coal , petrol and diesel .
( ii ) Breathing releases CO₂ in the atmosphere as a product of respiration .
( iii ) Decomposition of organic wastes and dead bodies by decomposer releases carbon dioxide to the atmosphere .
Q. 15. What is the greenhouse effect ? [ NCERT Q. 4 , Page 201 ]
Ans . ( i ) Greenhouse effect is an atmospheric phenomenon , in which an increase in the percentage of some gases such as carbon dioxide in the atmosphere causes the average temperatures to increase worldwide .
( ii ) Gases in the atmosphere , like water vapour ( clouds ) , carbon dioxide ( CO₂ ) , methane ( CH4 ) and nitrous oxide ( N₂O ) , act as a natural blanket . It prevents the Sun’s heat energy from radiating back into space .
( iii ) The natural greenhouse effect helps in warming the Earth’s surface by as much as 33 ° C , and without it , our planet would be too cold for humans to survive .
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