Soil micro-organisms are beneficial because of their

Explanation

Soil micro-organisms are tiny living organisms that inhabit the soil. These micro-organisms are beneficial because they help in the cycling of nutrients. This means that they break down organic matter in the soil, such as dead plant material, animal waste, and other organic debris, into simpler compounds that plants can use as nutrients. This process is important because it helps to enrich the soil and make it more fertile. The other options listed in the question, such as photosynthesis, translocation, and respiration, are not functions of soil micro-organisms. Photosynthesis, for example, is a process that occurs in plants, while translocation refers to the movement of water and nutrients within plants. Respiration using soil air is also not a function of soil micro-organisms. In summary, soil micro-organisms are beneficial because they help in the cycling of nutrients, which makes the soil more fertile and helps plants to grow better. Therefore, the correct answer to the question is option C.