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TOPIC 2 – A GROWING CONCERN

TOPIC 2 – A GROWING CONCERN. PESTICIDES ARE USED TO GET RID OF PESTS. (ANY UNWANTED ORGANISM – USUALLY DUE TO COMPETITION WITH WHAT HUMANS WANT). HERBICIDES. USED TO GET RID OF UNWANTED PLANTS. EG ROUNDUP, 2 – 4 D. INSECTICIDES. USED TO GET RID OF INSECTS EXAMPLES – RAID, MALATHYON, DDT.

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TOPIC 2 – A GROWING CONCERN

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  1. TOPIC 2 – A GROWING CONCERN PESTICIDES ARE USED TO GET RID OF PESTS. (ANY UNWANTED ORGANISM – USUALLY DUE TO COMPETITION WITH WHAT HUMANS WANT)

  2. HERBICIDES • USED TO GET RID OF UNWANTED PLANTS. EG ROUNDUP, 2 – 4 D

  3. INSECTICIDES • USED TO GET RID OF INSECTS • EXAMPLES – RAID, MALATHYON, DDT

  4. FUNGICIDES • USED TO GET RID OF FUNGUS / MOLDS

  5. DDT • ORIGINALLY SEEN AS A MEDICAL BREAKTHROUGH - LICE • CREATOR RECEIVED NOBEL PRIZE • MOST RECENTLY USED TO KILL MOSQUITOES AND REDUCE MALARIA • SOFTENED THE EGG SHELLS OF EAGLES AND FALCONS • Read page 190 questions 1 – 6 (191)

  6. PESTICIDE ISSUES • NON – SELECTIVE – THEY KILL UNINTENDED ORGANISMS • EG. ROUNDUP • YOU MAY WANT TO SPRAY TO GET RID OF APHIDS BUT IT KILLS BEES AS WELL.

  7. NATURAL IMMUNITY • BECAUSE SOME ORGANISMS WILL BE NATURALLY RESISTANT TO THE CHEMICALS, THEY WILL PASS IT TO OFFSPRING. THIS MEANS WE HAVE TO CONSTANTLY BE DEVELOPING NEW PESTICIDES

  8. BIOMAGNIFICATION • AS CHEMICALS MOVE UP THE FOOD CHAIN, THEY BECOME MORE CONCENTRATED AND INCREASE IN HARMFUL EFFECTS. • DIAGRAM PAGE 189 READ PAGE 192 AND 194 TOPIC 2 REVIEW PAGE 196 (1 – 6)

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