CBSE Class 9 Science OTBA Guidance issued by CBSE

CBSE Class 9 Science OTBA Guidance issued by CBSE. Revision worksheets, Sample papers, Question banks and easy to learn study notes for all classes and subjects based on CBSE and CCE guidelines. Students and parents can download free a collection of all study material issued by various best schools in India. The study material has been carefully compiled by the best teachers in India. The students should practice the questions database to get better marks in examination. Please refer to other links for free download of high quality study material. Based on CBSE and CCE guidelines. Based on the same pattern as released by CBSE every year. Study material for final/ term/ SA1/ SA2 Examinations conducted by various schools affiliated to Central Board of Secondary Education (CBSE) in India and abroad. CBSE Study material has been compiled to help students preparation which will helps the students to concentrate more in areas which carry more marks.

1. Theme – Clean Air –A shared Concern 


Human activities have put water and air in a bad state 

Let’s save, freshen and conserve them before it is too late.

Clean air isvital for theexistence and continuance ofall living organisms onearth. Naturally existing mixture of gases in the atmosphere, comprising of mainly Nitrogen, Oxygen, Carbon dioxide and water vapours, provides excellent conditions to support and sustain life. However, this natural composition of air is getting disturbed due to variety of human activities. Human activities related to mainly industry, vehicular emissions, burning of fossil fuels, accidental nuclear emissions etc. contaminate the natural air with undesired components resulting in air pollution. These components, called pollutants, are not only  harmful  for  living  organisms  but  also  affect  non–living  things  adversely.  The  situation  is  quite alarming,  particularly  in  big  industrialized  cities.  With  worldwide  trend  of  shifting  of  human population  to cities  and  their  human  desire  to  lead  more  comfortable  life,  the  issues  and  concerns related to availability of clean air for survival are becoming a great challenge for everyone. The present text attempts to help the reader comprehend the situation in a holistic manner, identify the  causes  and  effects  of  air  pollution,  examine  and  analyze  the  existing  status,  reflect,  debate  and generate ideas as to what actions need to be taken at individual, collective or governmental level to meet the emerging challenges. 

The Context The  atmosphere  surrounding  the  earth  is  a  mixture  of  many  gases  which,  along  with  the  other conditions,  makes  it  a  unique  planet  for  existence  of  life.  Unprecedented  urbanisation  and development during the past few centuries and many human activities havedisturbed the natural composition of this atmosphere. It is unfortunate that the cost of development is very heavy and is being paid by causing a severe damage to the life support system in the form of clean air. The contamination of air with undesirable gases and particulate matter is called air pollution. The substances  which  cause  pollution  are  called  pollutants.  These  are  either  gaseous  pollutants  like oxides of carbon, sulphur, nitrogen etc. or particulate matter in the form of dust, smoke, fumes or mist. A person living in a city with polluted air is likely to suffer from one or the other breathing problem. 

Please refer to attached file for CBSE Class 9 Science OTBA Guidance issued by CBSE



Click to View or Download pdf file
Click for more Science Study Material

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

Class 10 and Class 12 Board Exams to be resumed only for Main Subjects

The CBSE Board Exams have been postponed twice this year! New Delhi: The Education Ministry has urged the Central Board of Secondary Education (CBSE) to reinstitute the board exams only for the main subjects. As per the official statement the Board will not conduct...

CBSE Board Exams in July Press Release

CBSE has released press note for the dates for the CBSE Board exams for Class 10. CBSE said “With regards to conduct of Class X examinations several queries are being received by the CBSE. In this context, it is once again reiterated that remaining examinations of...

CBSE Recommends Arogya Setu App, Writes To School Principals

Written recommendation from CBSE to school principals for initiating the Arogya Setu App! New Delhi:  The Central Board of Secondary Education has advised all school principals through a written communication recommending the “Arogya Setu App” and Health Ministry's...

Board Exams Class 10 and Class 12 Datesheet 2020

CBSE has announced the datesheet for the remaining exams of class 10 and class 12 exams. The exams are going to start in July. The class 10 and 12th board exams will be conducted for the remaining 29 papers from July 1 to July 15, 2020, at various centers nominated by...

Applied Mathematics Introduced by CBSE as Elective for Class 11 and Class 12

Mathematics Syllabus Revised by CBSE at the Senior Secondary Level! The Central Board of Secondary Education (CBSE) to offer 'Applied Mathematics' as an Elective for XI and XII standard students. The elective subject, Applied Mathematics, is focused at evolving an...

Checking of Boards Answer sheets starts today

CBSE has instructed almost 3000 schools to start the evaluation work for class 10th and class 12th board exam answer sheets from today. The checking of answer sheets for class 10th and class 12th was stopped earlier due to covid crisis in the country. Now in order to...

Studies Today