Q. Consider the following statements regarding Bioremediation:
1.In-situ bioremediation treats contaminated soil and groundwater directly at the site using methods such as bioventing and biosparging.
2.Ex-situ bioremediation is always preferred over in-situ bioremediation because it avoids excavation and reduces labour costs.
3.Marine oil spill bioremediation often uses indigenous oil-degrading microorganisms such as Alcanivorax to break down oil pollutants.
4.Bioremediation can help in the removal of toxic heavy metals like lead, cadmium, and chromium using microorganisms and algae.
How many of the above statements are correct?
Answer: B
Notes:
Explanation:
- In-situ bioremediation indeed treats pollutants at the contamination site using methods like bioventing and biosparging.
- Ex-situ bioremediation requires excavation and transport, so it usually involves more labour and higher costs compared to in-situ.
- Marine oil spill bioremediation uses indigenous microorganisms such as Alcanivorax to degrade oil.
- Certain microorganisms and algae (e.g., Pseudomonas putida, Chlorella vulgaris) can remove toxic heavy metals through processes like adsorption and detoxification.
Source: Environment (N.C.E.R.T)
