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What are pesticides and herbicides? Expl...

What are pesticides and herbicides? Explain giving examples.

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Herbicides: These are the chemicals employed to control weeds. The common herbicides are sodium chlorate `(NaClO_(3))` and sodium arsenite `(Na_(3)AsO_(3))`. These herbicides are no longer preferred because they are toxic towards mammals. Al present organic herbicides like trazines are used as weeds controller and have no adverse effect on human beings.
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CHHAYA PUBLICATION-ENVIRONMENTAL CHEMISTRY-SOLVED NCERT EXERCISE
  1. Define environmental chemistry.

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  2. Explain tropospheric pollution in 100 words.

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  3. Carbon monoxide gas is more dangerous than carbon dioxide gas. Why?

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  4. List gases which are responsible for greenhouse effect.

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  5. Statues and monuments in India are affected by acid rain. How?

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  6. What is smog! How is classical smog different from photochemical smogs...

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  7. Write down the reactions involved during the formation of photochemica...

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  8. What are the harmful effects of photochemical smog and how can they be...

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  9. What are the reactions involved for ozone layer depletion in the strat...

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  10. What do you mean by ozone hole? What are its consequences?.

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  11. What are the major causes of water pollution? Explain.

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  12. Have you ever observed any water pollution in your area? What measures...

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  13. What do you. mean by Biochemical Oxygen Demand (BOD)?

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  14. Do you observe any soil pollution in your neighbourhood? What efforts ...

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  15. What are pesticides and herbicides? Explain giving examples.

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  16. What do you mean by green chemistry? How will it help decrease environ...

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  17. What would have happened if the greenhouse gases were totally missing ...

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  18. A large number of fish are suddenly found floating dead on a lake. The...

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  19. How can domestic waste be used as manure?

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  20. For your agricultural field or garden you have developed a compost pro...

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