Ozone depletion occurs commonly due to_______________?
Correct answer: B. Chlorofluorocarbons
- A. Carbon dioxide
- B. Chlorofluorocarbons
- C. UV rays
- D. Deforestation
Explanation
Chlorofluorocarbons release chlorine radicals in the stratosphere, and these radicals catalytically destroy ozone molecules. UV radiation is absorbed by ozone rather than being the usual cause of its depletion, so c reflects a cause-and-effect confusion.
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Biotechnology applies genetic engineering, cell culture and recombinant DNA methods to medicine and public health. The material includes production of insulin, vaccines and antibiotics, diagnostic techniques, gene therapy, genetically modified organisms and the ethical concerns surrounding manipulation of human genes.
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