CBSE Class 9 Natural resources

Scroll down for PDF

CBSE Class 9 Natural resources. Learning the important concepts is very important for every student to get better marks in examinations. The concepts should be clear which will help in faster learning. The attached concepts made as per NCERT and CBSE pattern will help the student to understand the chapter and score better marks in the examinations.


Nature Of Resources

1. The” Biosphere” is the life supporting zone of the earthwith three sub-zones called as lithosphere (rock part), atmosphere (air part)and hydrosphere (water part).

Breath of air

2. Composition of Air


3.The interactions between different components of the Biosphere to maintain the balance between the biotic and a biotic component makes “Biogeochemical cycle”. Ex. Water Cycle, Nitrogen Cycle, Carbon cycle, Oxygen Cycle,

4. Role of atmosphere in climate control : atmosphere act as protective blanket for the earth. Since atmosphere is a bad conductor of heat, it keeps the average temperature of the earth constant. At night, it slows down the escape of heat into outer space.

5. The movement of air : the atmosphere gets heated from the radiation that is reflected back by the land or water bodies. As a result of heating, convection currents are set up in the air. Since land gets heated faster than water, the air over land gets heated faster than air above water bodies.

6. In coastal regions, during the day, the air above the land gets heated faster and starts rising. So a region of low pressure is created and air over sea moves into this area of low pressure. The movement of air from one region to the other region causes Wind.

7. During the day, the direction of wind would be from the sea to the land and at night, both land and sea starts to cool. Since water cools down slower than the land, the air above water would be warmer than air above land, thus the direction of wind would be from the land to the sea.

8. Air pollution : it is an undesirable change in the physical, chemical or biological characteristics. It is caused due to an increase in the content of harmful substances (pollutant) such as oxides of nitrogen and sulphur, etc.

9. Harmful effect of air pollution :

• It affects the respiratory system causing breathing difficulties eg; bronchitis, asthma, lung cancer, tuberculosis, etc.

• Burning of fossil fuels like coal and petroleum releases oxides of nitrogen and sulphur. Inhalation of these gases is dangerous.

• Combustion of fossil fuel also increases the amount of suspended particles in air. The presence of high levels of all these pollutants, reduce visibility in cold weather where water also condenses out of air forming smog.

• Acid rain formed from the gases like sulphur dioxide and nitrogen oxides present in polluted air. It causes damage to living and non- living thing.

3. The Water Cycle:

a) The process in which water evaporates and falls on the land as rain and later flows back into the sea via rivers is known as the “Water Cycle”. Water flows through rocks containing soluble minerals, some of them get dissolved in the water. Thus the rivers carry many nutrients from the land to sea and these are used by the marine organisms.

b) When the water vapors condense as water droplets and grow big and heavy, they fall down in the form of “rain”. It ranges from 5 cm to 200 cm of rain fall in a year in our

country. In large parts of India, rains are mostly brought by the south-west or north-east monsoons. Depressions in the Bay of Bengal may also cause rains in some areas.

c) Water is a wonder liquid because all cellular processes take place in a water medium; substances are transported in a dissolved form; terrestrial forms require fresh water to maintain the equilibrium of salts; major resource to determine the life on the earth.

d) The dissolved fertilizers (NPK fertilizers), pesticides (DDT), sewage (Disease causing Organisms), waste from factories (Mercury) and water released from the dams can affect the life forms on the earth. The dissolved Oxygen is being used by the animals and plants that live in water, would adversely affect the aquatic organisms. The change in temperature would be dangerous for the eggs and larvae of the various animals particularly susceptible to temperature changes. It leads to “water pollution”.

Please click the link below to download pdf file for CBSE Class 9 Natural resources.


Click on the text For more study material for Science please click here - Science

Latest NCERT & CBSE News

Read the latest news and announcements from NCERT and CBSE below. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning

Checking of Boards Answer Sheets Notice

As you all are aware that the boards exams have been postponed due to Corona Virus. You can refer to the notification issued by CBSE too. While the board exams were going on the checking of answer sheets were also going on. CBSE took really good measures to increase...

All Delhi Schools to Adopt DIGITAL Attendance Methods

The Delhi Government takes another step ahead towards Digitalization of the Education Sector by proposing digital attendance in all Delhi Government Schools. As part of the Zero Paperwork Programme the attendance in all Delhi government school to be noted on e-tablets...

CBSE Board Exams to be executed as per normal schedule

The Central Board of Secondary Education (CBSE) announced on Saturday, the 29th of February’2020 that the Board examinations for standard X and XII will be executed according to the decided schedule from 2nd March’2020 onwards. This announcement also includes the areas...

CBSE allows calculator in Board Exam for CWSN

The CBSE Board released an important notification regarding the upcoming CBSE 10th and 12th Board Exam 2020. The notification states that in the Board exams for children with special needs (CWSN), the CBSE Board will allow the use of simple basic calculators. According...

CBSE wont use Failed or Compartment in CBSE result mark sheet

CBSE has announced a significant change in the CBSE 10th and 12th mark sheet of the results to be given to the students. The CBSE board also decided to end the use of the words “failed” or “compartmental” given to students in the CBSE Board Report 2020 mark sheet....

Noida School to Shut For 3 Days Coronavirus Detected

Some of the schools in Noida have decided to shut for 3 Days because father of two students in Noida was traced to be infected with the contagious Coronavirus. The internal exams have also been cancelled in those schools after the virus alarm. A 45 year old male who is...

Studies Today