Explanation: Mountain forests are a specific type of forest ecosystem that is found in the hilly and mountainous regions of various parts of the world, including India. In the context of Sikkim, these forests are characterized by their unique flora and fauna that are adapted to the cooler, mountainous climate. The key to understanding which tree species are found in these forests lies in recognizing the specific climatic conditions and ecological requirements of each tree species.
Cedar trees, scientifically known as Cedrus, are a genus of coniferous trees that are well-suited to the mountainous regions of Sikkim. They are known for their ability to grow in high altitudes and withstand cold temperatures, which are typical of the Himalayan climate. Cedar trees are often found at elevations ranging from 1,500 to 3,000 meters above sea level, making them a common sight in the mountain forests of Sikkim.
In contrast, Teak (Tectona grandis) is a tropical hardwood tree that is native to the tropical and subtropical regions of South and Southeast Asia. Teak trees require a warm and humid climate to thrive, which is not found in the mountainous regions of Sikkim. Therefore, Teak trees are not found in the mountain forests of Sikkim.
Cacti (Cactaceae) are a family of plants that are adapted to arid and semi-arid regions, such as deserts. They are not adapted to the cooler and more humid climate of the mountainous regions of Sikkim, and thus are not found in these areas.
Sundari trees (Heritiera fomes) are a species of mangrove tree that are found in the Sundarbans, a vast mangrove forest located in the coastal regions of West Bengal and Bangladesh. These trees are adapted to the saline and tidal conditions of the coastal regions and are not found in the mountainous regions of Sikkim.
In summary, the correct answer is Cedar because it is a tree species that is well-adapted to the mountainous regions of Sikkim, where it can thrive in the cooler and more humid climate. The other options are incorrect because they are not adapted to the specific climatic conditions found in the mountain forests of Sikkim.