Correct Option: B. Selective logging with replanting Detailed Explanation: 1. Understanding Sustainable Forest Management: Sustainable forest management (SFM) aims to maintain and enhance the economic, social, and environmental values of forests for present and future generations. This involves practices that ensure forests can regenerate, support biodiversity, and provide ecosystem services. 2. Why Selective Logging with Replanting is Effective: - Selective Logging: This practice involves the careful removal of certain trees while leaving others standing. This method minimizes damage to the surrounding ecosystem and allows for the preservation of the forest structure and biodiversity. By not removing all trees, the forest can continue to provide habitat for wildlife, maintain soil stability, and support various plant species.

• Replanting: After selective logging, replanting native tree species helps restore the forest. This practice ensures that the forest can regenerate and maintain its ecological functions. Native species are better adapted to the local environment and support local wildlife, which is crucial for biodiversity conservation.
• Biodiversity Conservation: By maintaining a mix of tree species and allowing natural regeneration, selective logging with replanting supports a diverse range of flora and fauna. This diversity is essential for ecosystem resilience, enabling forests to withstand pests, diseases, and climate change.

3. Why the Other Options are Incorrect:

• A. Clear-cutting large areas of forest:
• Explanation: Clear-cutting involves removing all trees in a designated area, which leads to significant habitat destruction, soil erosion, and loss of biodiversity. This practice disrupts the ecosystem and can take decades or even centuries for the forest to recover, if it recovers at all. It is not sustainable and does not promote biodiversity conservation.
• C. Monoculture planting of fast-growing species:
• Explanation: Monoculture planting refers to the cultivation of a single species over a large area. While it may provide quick economic returns, it severely limits biodiversity and makes the ecosystem more vulnerable to pests and diseases. Such practices can degrade soil health and reduce the resilience of the forest ecosystem, making it less sustainable in the long term.
• D. Complete forest removal for agricultural expansion:
• Explanation: This practice involves clearing entire forests to make way for agriculture, which leads to the complete loss of forest ecosystems. It results in habitat destruction, increased carbon emissions, and soil degradation. This option is the least sustainable and directly contradicts the principles of biodiversity conservation and sustainable forest management.

Summary of Key Points:

• Selective logging with replanting promotes forest health and biodiversity by allowing natural regeneration and maintaining ecosystem functions.
• Clear-cutting destroys habitats and is unsustainable, leading to long-term ecological damage.
• Monoculture planting reduces biodiversity and increases vulnerability to pests and diseases.
• Complete forest removal for agriculture results in total ecosystem loss and is detrimental to sustainability.

Revision Summary:

• Sustainable forest management aims to balance ecological, economic, and social needs.
• Selective logging with replanting supports biodiversity and ecosystem resilience.
• Clear-cutting and monoculture practices are harmful to forest health and biodiversity.
• Complete forest removal for agriculture is the least sustainable option.