ESS IB, All the Case Studies with Complete Solutions

ESS IB, All the Case Studies with Complete Solutions Evaluate the uses of DTT. - Correct Answer Pros: - Relatively cheap - Highly persistent so that it continues for months after application to kill insects such as mosquitoes that carry disease - Used to virtually* eliminate malaria dengue fever and filariasis* - Estimated to have *saved about 50 million human lives* and to have prevented more than *a thousand million* human illnesses Cons: - kills all insects that come in contact with it. - thinning birds' eggshells; reducing their population numbers - it is *persistent* -> fall into the food chain => *bioaccumulate and biomagnified* - affect the development of children e.g in *Yaqui Valley, Mexico* More detail: Evaluate a named historical event that lead to the banning of DTT. - Correct Answer *Rachel Carson: Silent Spring* - *1962*: Shows the impacts of DTT on the environment and human's health. Leading to the ban of DTT by world agriculture in *2001* Pros: - reduce/stop biomagnification of DDT - improvement in child's development - reduce cancer, asthma, pregnancy loss - environmental system can recover