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NCERT solutions Biology Textbook for Class 12 chapter 16 Environmental Issues

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Chapter 16 - Environmental Issues

Page 286

What are the various constituents of domestic sewage? Discuss the effects of sewage discharge on a river.

Q 1 | Page 286 |

List all the wastes that you generate, at home, school or during your Trips to other places, could you very easily reduce? Which would be Difficult or rather impossible to reduce?

Q 2 | Page 286 |

Discuss the causes and effects of global warming. What measures need to be taken to control global warming?

Q 3 | Page 286 |

Match the items given in column A and B:

  Column A   Column B
a Catalytic converter 1 Particulate matter
b Electrostatic precipitator 2 Carbon monoxide and nitrogen oxides
c Earmuffs 3 High noise level
d Landfills 4 Solid wastes
Q 4 | Page 286 |

Write critical notes on Eutrophication

Q 5.1 | Page 286 |

With the help of a flow-chart exhibit the events of eutrophication.

Q 5.2 | Page 286 |

Write critical notes Groundwater depletion and ways for its replenishment

Q 5.3 | Page 286 |

Discuss the role of women and communities in protection and conservation of forests.

Q 6 | Page 286 |

What measures, as an individual, you would take to reduce environmental pollution?

Q 8 | Page 286 |

Discuss briefly the following:

Radioactive wastes

Q 9.1 | Page 286 |

Discuss briefly Defunct ships and e-wastes

Q 9.2 | Page 286 |

Discuss briefly the following 

Municipal solid wastes

Q 9.3 | Page 286 |

What initiatives were taken for reducing vehicular air pollution in Delhi? Has air quality improved in Delhi?

Q 10 | Page 286 |

Discuss briefly about Greenhouse gases

Q 11.1 | Page 286 |

Discuss briefly about Catalytic converter

Q 11.2 | Page 286 |

Discuss briefly about Ultraviolet B

Q 11.3 | Page 286 |

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