Correct Option: B. Habitat restoration Explanation of Why the Answer is Correct Habitat restoration is a key strategy in ecological management aimed at maintaining and enhancing biodiversity within ecosystems. This practice involves the process of returning a degraded or damaged ecosystem to a stable, healthy state that can support a diverse range of species. Here’s a step-by-step breakdown of why habitat restoration is crucial for biodiversity:

1. Understanding Biodiversity: Biodiversity refers to the variety of life in a particular habitat or ecosystem, including the diversity of species, genetic variation, and the variety of ecosystems themselves. High biodiversity is essential for ecosystem resilience, productivity, and stability.
2. Impact of Degradation: Ecosystems can become degraded due to various factors such as pollution, deforestation, urbanization, and climate change. This degradation often leads to habitat loss, which is one of the primary threats to biodiversity. When habitats are lost or altered, many species may struggle to survive, leading to declines in population and even extinction.
3. Role of Habitat Restoration: Habitat restoration aims to reverse the effects of degradation by rehabilitating ecosystems. This can involve:
4. Replanting native vegetation: This helps restore the natural habitat and provides food and shelter for local wildlife.
5. Removing invasive species: Invasive species can outcompete native species for resources, so their removal is crucial for restoring balance.
6. Reestablishing natural processes: This may include restoring water flow in wetlands or reintroducing fire to certain ecosystems that depend on it for regeneration.
7. Benefits of Restoration: By restoring habitats, we can:
8. Increase species diversity by providing suitable environments for various organisms.
9. Enhance ecosystem services such as pollination, water purification, and carbon sequestration.
10. Improve resilience against environmental changes, making ecosystems more robust in the face of challenges like climate change.

Explanation of Why the Other Options are Wrong or Weaker A. Monoculture cultivation: - Monoculture refers to the agricultural practice of growing a single crop species over a wide area for many consecutive years. This practice is detrimental to biodiversity because it reduces the variety of plants and animals in an area, making ecosystems more vulnerable to pests and diseases. It can lead to soil degradation and loss of ecosystem services, which ultimately harms biodiversity. C. Urban development: - Urban development typically involves the conversion of natural habitats into urban areas, which leads to habitat destruction and fragmentation. This process often results in the loss of biodiversity as species are displaced or unable to adapt to the altered environment. While urban areas can incorporate green spaces, the overall impact of urban development is generally negative for biodiversity. D. Invasive species introduction: - Introducing invasive species is one of the most significant threats to biodiversity. Invasive species can outcompete native species for resources, disrupt food webs, and alter habitat structures. They often lack natural predators in their new environments, allowing them to proliferate unchecked, which can lead to the decline or extinction of native species. Summary of Key Points for Revision

• Habitat restoration is essential for maintaining biodiversity by rehabilitating degraded ecosystems.
• It involves actions like replanting native species, removing invasive species, and restoring natural processes.
• Monoculture, urban development, and invasive species introduction are practices that negatively impact biodiversity.
• High biodiversity is crucial for ecosystem resilience, stability, and the provision of essential ecosystem services.