The correct option is C. Monoculture farming. Detailed Explanation Monoculture farming refers to the agricultural practice of growing a single crop species over a wide area for many consecutive years. This practice is prevalent in modern agriculture due to its perceived efficiency and ease of management. However, it has significant drawbacks that contribute to soil degradation and loss of biodiversity. Why Monoculture Farming is Detrimental:

1. Soil Degradation:
2. Nutrient Depletion: Growing the same crop repeatedly can lead to the depletion of specific nutrients in the soil. For example, if a farmer grows corn year after year, the soil may become deficient in nitrogen, which corn heavily utilizes. This can lead to reduced soil fertility over time.
3. Soil Erosion: Monoculture often involves minimal ground cover, which can increase soil erosion. Without diverse root systems to hold the soil in place, rain and wind can wash away the topsoil, which is crucial for plant growth.
4. Pest and Disease Build-Up: A single crop can attract specific pests and diseases, which can proliferate in the absence of natural predators. This can lead to increased pesticide use, further harming soil health and biodiversity.
5. Loss of Biodiversity:
6. Habitat Destruction: Monoculture farming reduces the variety of plants and animals in an area. This lack of diversity can lead to a decline in species that rely on diverse ecosystems for food and habitat.
7. Genetic Uniformity: When farmers rely on a single crop variety, they reduce genetic diversity. This makes crops more susceptible to diseases and pests, as there are fewer genetic traits to provide resistance.

Why the Other Options are Weaker: A. Crop Rotation: - Crop rotation involves alternating the types of crops grown in a particular area across seasons or years. This practice helps maintain soil fertility, disrupt pest and disease cycles, and improve soil structure. It is a sustainable practice that enhances biodiversity rather than degrades it. B. Sustainable Grazing: - Sustainable grazing practices involve managing livestock in a way that maintains the health of grasslands and prevents overgrazing. This method can enhance soil health and promote biodiversity by allowing for natural regeneration of plant species and maintaining a balanced ecosystem. D. Agroforestry: - Agroforestry combines agriculture and forestry practices to create more diverse and sustainable land-use systems. This practice enhances biodiversity by integrating trees with crops and livestock, improving soil health, and providing habitats for various species. Summary of Key Points:

• Monoculture farming leads to soil degradation and loss of biodiversity due to nutrient depletion, increased erosion, and pest build-up.
• Crop rotation, sustainable grazing, and agroforestry are practices that promote soil health and biodiversity.
• The lack of diversity in monoculture makes crops more vulnerable to diseases and pests, further exacerbating the issues of soil degradation.

Revision Summary:

• Monoculture farming is the most detrimental land use practice for soil and biodiversity.
• It leads to nutrient depletion, soil erosion, and increased pest problems.
• Alternative practices like crop rotation, sustainable grazing, and agroforestry enhance soil health and biodiversity.
• Understanding the impacts of different agricultural practices is crucial for sustainable farming.