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What’s the connection?. VOTE. I know what DDT is I can name an advantage of using DDT I can name a disadvantage of DDT I can discuss the effect of DDT in a food chain. By the end of today’s lesson you will be able to. Describe what DDT is and give 2 main uses of DDT. (level 5)
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VOTE • I know what DDT is • I can name an advantage of using DDT • I can name a disadvantage of DDT • I can discuss the effect of DDT in a food chain
By the end of today’s lesson you will be able to • Describe what DDT is and give 2 main uses of DDT. (level 5) • Discuss the advantages and disadvantages of DDT and give an opinion on it’s use. (level 6) • Evaluate how DDT was used. Was it the right thing to do? (level 7 – based on evidence)
DDT • Dichlorodiphenyltrichloroethane (DDT!) • Discovered in 1874 by a German scientist called Othmar Zeidler • Thought it was useless • In 1939 a Swiss scientist Paul Mueller found the same compound and discovered that it killed insects…
DDT “A benefit to humanity” • Within 4 years it was being mass produced • The Italian government used it to reduce an outbreak of typhus disease that was carried by insects • The US Army were give tins of the miracle powder for de-lousing troops • Paul Mueller won… A Nobel Prize
Within 20 years it was estimated that DDT had prevented 500 million deaths
Too Good to be True • As time went on scientists began to see the problems with DDT • It is insoluble in water but accumulates in fat • Works it way up the food chain • Implied in an increase in cancers
DDT and Bird Eggs • One problem from malaria was that its use was found to weaken the shells of bird eggs • How did the DDT get into bird eggs? • How many problems can you think of associated with this?
DDT Banned
By the end of today’s lesson you will be able to • Describe what DDT is and give 2 main uses of DDT. (level 5) • Discuss the advantages and disadvantages of DDT and give an opinion on it’s use. (level 6) • Evaluate how DDT was used. Was it the right thing to do? (level 7 – based on evidence)
TASK – Complete the worksheet • Turn in your graph paper and answer your questions in full sentences please.
By the end of today’s lesson you will be able to • Describe what DDT is and give 2 main uses of DDT. (level 5) • Discuss the advantages and disadvantages of DDT and give an opinion on it’s use. (level 6) • Evaluate how DDT was used. Was it the right thing to do? (level 7 – based on evidence)
VOTE • I know what DDT is • I can name an advantage of using DDT • I can name a disadvantage of DDT • I can discuss the effect of DDT in a food chain