CBSE Class 9 Science Natural Resources Notes Set A

Download CBSE Class 9 Science Natural Resources Notes Set A in PDF format. All Revision notes for Class 9 Science have been designed as per the latest syllabus and updated chapters given in your textbook for Science in Standard 9. Our teachers have designed these concept notes for the benefit of Grade 9 students. You should use these chapter wise notes for revision on daily basis. These study notes can also be used for learning each chapter and its important and difficult topics or revision just before your exams to help you get better scores in upcoming examinations, You can also use Printable notes for Class 9 Science for faster revision of difficult topics and get higher rank. After reading these notes also refer to MCQ questions for Class 9 Science given our website

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.

Chapter−14

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

class_9_science_concept_7

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.

Tags: 

 


Click to View or Download pdf file
Click for more Science Study Material
CBSE Class 9 Science Atoms And Molecules Notes Set A
CBSE Class 9 Science Atoms And Molecules Notes Set B
CBSE Class 9 Science Categories Of Practical Skills Notes
CBSE Class 9 Science Diversity In Living Organisms Notes Set A
CBSE Class 9 Science Diversity In Living Organisms Notes Set B
CBSE Class 9 Science Force And Laws Of Motion Notes Set A
CBSE Class 9 Science Force And Laws Of Motion Notes Set B
CBSE Class 9 Science Fundamental Unit Of Life Notes
CBSE Class 9 Science Gravitation And Fluid Notes Set A
CBSE Class 9 Science Gravitation And Fluid Notes Set B
CBSE Class 9 Science Gravitation And Fluid Notes Set C
CBSE Class 9 Science Improvement In Food Resources Notes Set A
CBSE Class 9 Science Improvement In Food Resources Notes Set B
CBSE Class 9 Science Is Matter Around Us Pure Notes Set A
CBSE Class 9 Science Is Matter Around Us Pure Notes Set B
CBSE Class 9 Science List Of Experiments
CBSE Class 9 Science Matter In Our Surroundings Notes Set A
CBSE Class 9 Science Matter In Our Surroundings Notes Set B
CBSE Class 9 Science Motion Notes
CBSE Class 9 Science Motion Notes Set A
CBSE Class 9 Science Natural Resources Notes Set A
CBSE Class 9 Science Natural Resources Notes Set B
CBSE Class 9 Science Physical Science Notes
CBSE Class 9 Science Revision Notes
CBSE Class 9 Science Sound Notes
CBSE Class 9 Science Structure Of Atom Notes Set A
CBSE Class 9 Science Structure Of Atom Notes Set B
CBSE Class 9 Science The Fundamental Unit Of Life Notes
CBSE Class 9 Science Tissue Notes Set A
CBSE Class 9 Science Tissue Notes Set B
CBSE Class 9 Science Wave Motion And Sound Notes
CBSE Class 9 Science Why Do We Fall Ill Notes Set A
CBSE Class 9 Science Why Do We Fall Ill Notes Set B
CBSE Class 9 Science Work Energy And Power Notes Set A
CBSE Class 9 Science Work Energy And Power Notes Set B

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

CBSE Board Examination Scheme of Assessment 2021 2022

A. Academic session to be divided into 2 Terms with approximately 50% syllabus in each term: The syllabus for the Academic session 2021-22 will be divided into 2 terms by following a systematic approach by looking into the interconnectivity of concepts and topics by...

Moderation of Marks Class 11 and 12 Board Exams

The portal for moderation and finalization of results for Class-12 is being opened from 16.07.2021 to 22.07.2021. As Board has to declare the result latest by 31.07.2021, schools have been requested to follow the schedule strictly and complete the moderation within...

CBSE Class 12 Evaluation Criteria 2021

SUMMARY OF THE POLICY FOR TABULATION OF MARKS FOR CLASS XII BOARD EXAMINATIONS 2021   1(a) Due to cancellation of the Board examinations, the assessment of theory portion of 80/70/60/50/30 marks will be done by the school based on the following:     Class...

CBSE asks schools to load Class 12 Internal Assessment Marks

This has a reference to the letter no CBSE/COORD/2021 dated 11.02.2021 regarding conduct of the School-Based Assessment (Internal Assessment/Practical/ Project) of Class-XII and uploading the marks by 11.06.2021. It has been observed that some schools have not been...

FAQs on Policy for Tabulation of Marks for Class 10 Board Exams

ON POLICY Question.1 How CBSE will declare the result of Class-X? Answer. Results of Class X Board will be declared on the basis of an objective criterion developed by the Board vide Notification no.CBSE/CE/2021 dated 01.05.2021. Question.2. If any candidate is not...

×
Studies Today