Question

recent studies have explored the phenomenon of microbial - induced calcite precipitation (micp), a process by which certain bacteria induce the formation of calcite in soils, potentially enhancing their strength and stability. this process, which naturally occurs at a slow rate in the natural environment, can be accelerated in a controlled manner in a lab to improve the mechanical properties of soil for construction purposes. researchers have found that by injecting micp - inducing bacteria into the soil, along with a nutrient - rich solution, they can significantly increase the soils load - bearing capacity, offering an eco - friendly, sustainable alternative to traditional chemical - based soil stabilization methods. the resulting material can be used to strengthen concrete before it is poured, or repair cracks in existing concrete structures, thus increasing their lifespan. which choice best states the main idea of the text? choose 1 answer: a micp is a natural process that can be artificially accelerated to improve soil stability for construction, providing an alternative to chemical methods. b the primary use of micp in the construction industry is to repair cracks in existing concrete structures. c researchers have recently discovered the bacteria responsible for micp and are still understanding how to apply this process in practical scenarios. d nutrient - rich solutions can be added to soil to accelerate micp and increase the soils load - bearing capacity.

Explanation:

The text mainly describes microbial - induced calcite precipitation (MICP), a natural process that can be accelerated in a lab to improve soil stability for construction, offering an alternative to traditional chemical - based methods. Option A captures this main idea. Option B is incorrect as repair of concrete cracks is just one of the uses, not the primary one. Option C is wrong as it's not about discovery of bacteria but about application of the process. Option D only focuses on part of the process (nutrient - rich solutions).

Answer:

A. MICP is a natural process that can be artificially accelerated to improve soil stability for construction, providing an alternative to chemical methods.