Answer : Option DExplaination / Solution:
Burning of coal and petroleum products are source of gases like carbon dioxide, methane , nitrous oxide and ozone.Presence of all these gases in atmosphere causes global warming.
Q3.A UN Conference on Climate Change, held in _____ in 1997, resulted in an international agreement to fight global warming which called for reductions in emissions of greenhouse gases by industrialised nations
Answer : Option CExplaination / Solution: No Explaination.
Q5.The problem of ozone depletion is caused in the stratosphere by high levels of compounds
Answer : Option CExplaination / Solution:
The problem of ozone depletion is caused by high levels of chlorine and bromine compounds in the stratosphere.The origins of these compounds are chlorofluorocarbons (CFC), used as cooling substances in airconditioners and refrigerators, or as aerosol propellants, and bromofluorocarbons (halons), used in fire extinguishers.
Q6.UV radiation seems responsible for (i) Skin cancer in humans (ii) Lower production of phytoplankton (iii) Influence the growth of terrestrial plants (iv) Decrease in cattle production. Options are
Answer : Option CExplaination / Solution: No Explaination.