Q Anthropogenic actions have caused evolution of species. Explain with the help of two examples?
Excess use of herbicide, pesticide etc has only resulted in selection of resistant varities in a much lesser time scale. this is also true for microbes against which we use antibiotics or drugs against eukaryotic organisms.
This tells us that Evolution is not a directed process in the sense of determinism. It is a stochastic process with chances events in nature and chance mutations in organisms.
For example, the use of DDT killed maximum number of mosquitoes first time but few of them survived due to development of variation. These mosquitoes reproduced successfully in presence of DDT and lead to the development of new resistant variety of mosquito population. Thus, led to the evolution of new organisms in short duration of time.