Correct Option: B. Habitat restoration Detailed Explanation: Why Habitat Restoration is the Correct Answer:

1. Definition of Habitat Restoration: Habitat restoration involves the process of returning a degraded or damaged ecosystem to a stable, healthy state. This can include replanting native vegetation, removing invasive species, and restoring natural water flows. The goal is to create an environment that supports a diverse range of species.
2. Importance of Biodiversity: Biodiversity refers to the variety of life in a particular habitat or ecosystem. It is crucial for ecosystem resilience, productivity, and stability. A diverse ecosystem can better withstand environmental changes and stresses, such as climate change, disease, and invasive species.
3. How Habitat Restoration Maintains Biodiversity:
4. Re-establishing Native Species: Restoration efforts often focus on reintroducing native species that have been lost due to human activities. Native species are adapted to the local environment and are essential for maintaining the ecological balance.
5. Creating Habitats: Restored habitats provide food, shelter, and breeding grounds for various organisms, thus supporting a wider range of species.
6. Enhancing Ecosystem Services: Healthy ecosystems provide services such as pollination, water purification, and carbon sequestration, which are vital for both the environment and human well-being.

Why the Other Options are Incorrect or Weaker: A. Monoculture Farming: - Definition: Monoculture farming is the agricultural practice of growing a single crop species over a wide area for many consecutive years. - Impact on Biodiversity: This practice reduces biodiversity significantly because it eliminates the variety of plants and animals that would naturally coexist in a diverse ecosystem. It can lead to soil degradation, increased vulnerability to pests and diseases, and a loss of habitat for wildlife. C. Urban Development: - Definition: Urban development refers to the expansion of cities and towns, often involving the conversion of natural habitats into residential, commercial, or industrial areas. - Impact on Biodiversity: Urban development typically leads to habitat destruction, fragmentation, and pollution, which severely threaten local wildlife and plant species. It often results in a decline in biodiversity as natural habitats are replaced with impervious surfaces and artificial structures. D. Pesticide Application: - Definition: Pesticide application involves using chemicals to kill pests that threaten crops and livestock. - Impact on Biodiversity: While pesticides can protect crops, they can also harm non-target species, including beneficial insects, birds, and aquatic life. The overuse of pesticides can lead to a decline in biodiversity by disrupting food webs and causing population declines in sensitive species. Summary of Key Points:

• Habitat restoration is the most effective practice for maintaining biodiversity as it focuses on reviving ecosystems and supporting a variety of species.
• Monoculture farming, urban development, and pesticide application all negatively impact biodiversity by reducing habitat variety and harming non-target species.
• Restoring habitats enhances ecosystem services and resilience, making it a sustainable approach to biodiversity conservation.

Revision Summary:

• Habitat restoration is crucial for maintaining biodiversity in managed ecosystems.
• Monoculture farming, urban development, and pesticide application harm biodiversity.
• Restored habitats support native species and enhance ecosystem services.
• Biodiversity is essential for ecosystem stability and resilience against environmental changes.