CBSE Pathshala

Social science class 9 CBSE Board Question paper 2015 9th maths Question Paper contributed by visitor 2015 Mathematics original papers 2015 class 9 CBSE sa2 [DAV Samastipur] Science original papers 2015 class 9 CBSE sa2 [SDV samastipur] Social Real papers 2015 class 9 CBSE sa2 [KV samastipur] Maths original papers 2015 Bal Bharati Public School Navi Mumbai class 9 CBSE sa2 9th class original paper 2015 term-2 :St.Xavier senior secondary school New CBSE Class IX Mathematics and Science Solved Question Paper for exam 2015

IX Maths Original Paper with OTBA 2014 Download File IX Science Original Paper with OTBA 2014 Download File IX Social Science Original Paper with OTBA 2014 Download File IX Hindi Original Paper with OTBA 2014 Download File IX English Original Paper with OTBA 2014 Download File

9th Biology Board solved Questions: Ch-13. Why do we fall ill?  Q. What is an antibiotic? Give its one example Ans: Antibiotic is a chemical substance that kill bacteria, secreted by microorganisms which can kill the pathogens Example – Penicillin Q. (i) Which disease is more harmful : Acute or Chronic disease ? Why? (ii) Why are we advised to take bland and nourishing food when we are sick? Ans: (i) Chronic disease Because chronic diseases have drastic long term effects on people’s health as compared to acute disease (ii) (a) Such food does not contain oil or fat and spices so it is digested easily (b) It provides sufficient energy for recovery after the disease (c) It provides adequate amount of nutrients required for regeneration of cells and tissues. Q. (i) How atmospheric inert nitrogen gas is converted into usable nitrogenous form for the various life forms? (ii) Draw a labelled diagram to show nitrogen cycle in nature Ans: (i) (i) By the help of free living nitrogen f...

1. What are pathogens?[1] Ans. Disease-causing organisms are called pathogens 2. List any two human activities that lead to an increase in the carbon dioxide content of air.[1] Ans: a. Combustion of wood. b. Deforestation. c. Respiration 3. (a) Name any two green house gases. (b) What causes global warming?[2] Ans:  (a) Carbon dioxide (CO2), methane (CH4), ozone (O3) and water vapour (H2O) green house gases. (b) The greenhouse gases do not allow heat rays to escape from the earth resulting in an increase of temperature of the earth. Hence, green house gases cause global warming. 4. Give two examples each of biodegradable and non-biodegradable pollutants.[2] Ans: Biodegradable pollutants-cow dung and paper Non-biodegradable pollutants-polythene, plastic and DDT 5. Write two points of difference between gymnosperms and angiosperms.[2] Ans:   Gymnosperms    (i) The seeds are naked. (ii) The microspores and megaspores are produced by male and female c...