IUCN, the International Union for Conservation of Nature, has identified Kew, Royal Botanical Garden as a site with a significant number of rare, threatened, and endangered species. According to IUCN, there are around 2,700 such species present in Kew, which is the correct answer to the question.

Explanation:

IUCN is an international organization that works towards conserving the environment and natural resources. One of its key objectives is to identify species that are at risk of extinction and take measures to protect them. Kew, Royal Botanical Garden is one of the sites that IUCN has identified as having a high concentration of rare, threatened, and endangered species.

The number of such species present in Kew is significant, with around 2,700 species falling under this category. This makes Kew an important site for conservation efforts, as protecting these species is crucial for maintaining biodiversity and ecological balance.

Conservation efforts at Kew:

Kew, Royal Botanical Garden, has been actively involved in conservation efforts for many years. The garden has a dedicated team of scientists and researchers who work towards protecting rare and endangered species. Some of the measures taken by Kew to conserve these species include:

- Conducting research to understand the threats faced by these species
- Developing conservation strategies and action plans
- Establishing seed banks and living collections to preserve plant species
- Collaborating with other institutions and organizations to share knowledge and resources
- Engaging with local communities and stakeholders to raise awareness about the importance of conservation.

Conclusion:

Kew, Royal Botanical Garden, is an important site for conservation efforts, with a significant number of rare, threatened, and endangered species present. IUCN's identification of Kew as a site with high conservation value underscores the importance of protecting these species for maintaining biodiversity and ecological balance. The conservation efforts undertaken by Kew and other institutions are crucial for ensuring the survival of these species for future generations.