Final answer:
An example of crude drug extraction is phytoremediation, where plants are used to remove toxic metals from contaminated soils, and is a form of bioremediation.
The correct option is All of these.
Step-by-step explanation:
An example of crude drug extraction is the use of plants to remove toxic metals from soils following a mining operation, also known as phytoremediation. This process is a type of bioremediation, which is the use of organisms or biological processes to detoxify and restore polluted environments.
In this context, certain plants, referred to as hyperaccumulators, have the ability to absorb and concentrate toxic elements from the soil into their tissues, which can then be harvested and properly disposed of or recycled.
In the section titled 'Which one of the following is an example of bioremediation?', option E specifically outlines this process.
Not only is phytoremediation a sustainable and environmentally friendly approach to managing contaminated sites, but it also harnesses the natural abilities of plant species to filter and clean the environment.
The correct option is All of these.