CBSE Pathshala

10th SSt. SA2  Sample Paper  issued by CBSE 2015                           Download File X Maths Sample Paper SA2 issued by CBSE (for 2015)                  Download File X Science SA2 Sample Paper issued by CBSE 2015)                         Download File X English Com  Sample Paper  SA2 by CBSE 2015                              Download File X English Language _  Literature  Sample Paper 2015                      Download File Solved papers for CBSE Board Exam                                                      Download File

Question: Water is known as ‘A Wonder Liquid’. Justify this statement by giving any two reasons Ans : Water is known as ‘A Wonder Liquid’ because most of the chemical reaction is only possible due to water. Living organism animals, plants, microorganisms, human beings mainly contain water that makes life possible on the earth. Environment temperature, rainfall etc are maintained by water. Question: The overuse of fertilizers and pesticides is harmful for the soil. Why ? Ans: Destroys soil structure by killing soil microbes that recycle nutrients in the soil. Kills earthworms which help in making rich humus.  Question: (a) What are the two ways by which carbon dioxide is „fixed‟ in our atmosphere.(b) Which gas is produced when glucose molecule breaks down releasing energy ? Ans: (a) the two ways by which carbon dioxide is fixed in our atmosphere are: (i) Green plants convert CO2 into glucose in presence of sunlight  (ii) Many marine animals use carbonates dissolved in sea w