Chapter Review:

• Coliform is a group of bacteria, found in human intestines, whose presence in water indicates contamination by disease-causing
  microorganisms.
• The pH of water easily checked by universal indicator or litmus paper.
• The three R’s to save the environment: Reduce, Recycle and Reuse.
• The oxides of sulphur and nitrogen and carbon monoxide are poisonous at high concentrations.
• Carbon dioxide is a green-house gas.
• Collection of rain water and its utilisation for various purposes is called water harvesting.
• Fossil fuels like coal and petroleum, which are important sources of energy.
• A person having interest or concern for some thing is called as stake holder.
• Multi Crore Project came in 1985 to improve the quality of Ganga.
• The Tawa Dam built in the 1970s.
• The Chipko Andolan movement originated from an incident in a remote village called Reni in Garhwal, high-up in the Himalayas during the early 1970s.
• National Award for Wildlife Conservation’ in the memory of Amrita Devi Bishnoi, who in 1731 sacrificed her life along with 363 others for the protection of ‘khejri’ trees in Khejrali village near Jodhpur in Rajasthan.
• Reuse is better than recycling as it saves energy.