Explanation: Ladakh, situated in the northernmost part of India, is a region characterized by its high altitude and cold, arid climate. The vegetation in this region is adapted to survive in harsh conditions, and the flora is sparse compared to more temperate or tropical regions. Willow trees are one of the few tree species that can thrive in such an environment due to their specific adaptations.
Willow trees (Salix spp.) are deciduous trees that are known for their ability to grow in a variety of climates, including cold and arid regions. They are particularly well-suited to the Ladakh region because they can withstand cold temperatures and limited water availability. Willow trees have a shallow root system that allows them to access water from the upper layers of soil, which is crucial in areas where water is scarce. Additionally, they can grow in a variety of soil types, including sandy and rocky soils, which are common in Ladakh.
The climate of Ladakh is characterized by long, cold winters and short, mild summers. The region experiences low precipitation and high evaporation rates, making it a challenging environment for most plant species. However, willow trees have evolved to cope with these conditions. They are able to survive the harsh winters by shedding their leaves and going into a dormant state, and they can quickly regrow their leaves and resume growth during the short growing season.
In contrast, tropical trees like mango (Mangifera indica) and coconut (Cocos nucifera) require a warm, humid climate and plenty of water to grow and thrive. These conditions are not present in the high-altitude, cold region of Ladakh, making it impossible for these trees to survive. Similarly, cotton (Gossypium spp.) is a crop that requires a warm, humid climate and a long growing season, which are not available in Ladakh.
Therefore, among the given options, the willow tree is the only species that is commonly found in Ladakh due to its ability to adapt to the region's cold, arid climate. This makes option B the correct answer.