NCERT Solutions for Class 9 Science Unit 14

Natural Resources Class 9

Unit 14 Natural Resources Exercise Solutions

Biosphere: The whole combination of animals, plants and non-living beings which by their interaction make the planet earth a live and vibrant place is called biosphere.
Biotic Components: Living things constitute the biotic component of the biosphere.
Abiotic Components: The air, the water and the soil form the non-living or a biotic component of the biosphere. The air is called the hygrosphere, the water is hydrosphere and the soil is called lithosphere.
<< Previous Chapter 13 : Why Do We Fall ill Next Chapter 15 : Improvement in Food Resources >>

Question : Solutions of Questions on Page Number : 193

Q1 :  

How is our atmosphere different from the atmospheres on Venus and Mars?


Answer :

Earth's atmosphere is different from those of Venus and Mars. This difference lies essentially in their compositions. Earth's atmosphere is a mixture of nitrogen (79%), oxygen (20%), and a small fraction of carbon dioxide, water vapours and other gases. This makes the existence of life possible on Earth. However, the atmospheres on Venus and Mars mainly consist of carbon dioxide. The amount of carbon dioxide on these planets can range from 95% to 97%.

Answer needs Correction? Click Here

Q2 :  

How does the atmosphere act as a blanket?


Answer :

The atmosphere acts as a blanket by performing the following functions:

(a) It keeps the average temperature of the Earth fairly constant during day time and even during the course of whole year.

(b) It prevents a sudden increase in the temperature during day time.

(c) It slows down the escape of heat from the surface of the Earth into outer space during night time.

Answer needs Correction? Click Here

Q3 :  

What causes winds?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q4 :  

How are clouds formed?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q5 :  

List any three human activities that you think would lead to air pollution.


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q6 :  

Why do organisms need water?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q7 :  

What is the major source of fresh water in the city/town/village where you live?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q8 :  

Do you know of any activity which may be polluting this water source?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q9 :  

How is soil formed?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q10 :  

What is soil erosion?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q11 :  

What are the methods of preventing or reducing soil erosion?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q12 :  

What are the different states in which water is found during the water cycle?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q13 :  

Name two biologically important compounds that contain both oxygen and nitrogen.


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q14 :  

List any three human activities which would lead to an increase in the carbon dioxide content of air.


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q15 :  

What is the greenhouse effect?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q16 :  

What are the two forms of oxygen found in the atmosphere?


Answer :

Please Register/Login to get access to all solutions Facebook Login
<< Previous Chapter 13 : Why Do We Fall ill Next Chapter 15 : Improvement in Food Resources >>

Exercise : Solutions of Questions on Page Number : 201

Q1 :  

Why is the atmosphere essential for life?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q2 :  

Why is water essential for life?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q3 :  

How are living organisms dependent on the soil? Are organisms that live in water totally independent of soil as a resource?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q4 :  

You have seen weather reports on television and in newspapers. How do you think we are able to predict the weather?


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q5 :  

Write a note on how forests influence the quality of our air, soil and water resources.


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q6 :  

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?


Answer :

Please Register/Login to get access to all solutions Facebook Login
<< Previous Chapter 13 : Why Do We Fall ill Next Chapter 15 : Improvement in Food Resources >>

Science : CBSE NCERT Exercise Solutions for Class 9th for Natural Resources will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

Popular Articles