Under certain conditions soil nutrients get tied up with the biomass of microbes and becomes temporarily unavailable to other organism such incorporation of nutrients is called –

Options

A. Nutrient immobilisation
B. Acclimatisation
C. Mineralisation
D. Leaching

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about a process where soil nutrients become temporarily unavailable to other organisms due to their incorporation into the biomass of microbes.

2. **Identifying Key Terms**: The key terms in the question are "soil nutrients," "biomass of microbes," and "temporarily unavailable." This indicates a process where nutrients are absorbed by microbes and not accessible for other organisms.

3. **Analyzing the Options**:
- **Nutrient Immobilization**: This refers to the process where inorganic nutrients are taken up by microbes and converted into organic forms, making them unavailable for plants.
- **Acclimatization**: This term relates to organisms adjusting to changes in their environment, which does not pertain to nutrient availability.
- **Mineralization**: This is the reverse process where organic nutrients are converted back into inorganic forms, making them available for plant uptake.
- **Leaching**: This involves the movement of soluble substances through the soil, which is unrelated to the incorporation of nutrients into microbial biomass.

4. **Choosing the Correct Answer**: Based on the definitions and processes described, the correct answer is **Nutrient Immobilization**. This is because it specifically describes the situation where nutrients are taken up by microbes and thus become temporarily unavailable to plants.

5. **Conclusion**: Therefore, the incorporation of nutrients into the biomass of microbes, making them temporarily unavailable to other organisms, is called **Nutrient Immobilization**.