Explanation: The Yamuna River is considered the lifeline of Delhi due to its historical, cultural, and ecological significance. The river flows through the city, providing water for various purposes and supporting the local ecosystem. The Yamuna has been a central feature of Delhi's urban landscape for centuries, playing a crucial role in the city's development and sustenance.
Historically, the Yamuna has been a source of water for irrigation, drinking, and industrial use. It has also been a significant cultural and religious symbol, with numerous ghats and temples along its banks. The river has been a focal point for various festivals and rituals, contributing to the cultural identity of Delhi.
Ecologically, the Yamuna supports a diverse range of flora and fauna. The river and its surrounding areas provide habitats for various species of birds, fish, and other wildlife. The river's ecosystem is vital for maintaining the ecological balance of the region.
In terms of urban geography, the Yamuna River has influenced the layout and development of Delhi. Many important landmarks and areas of the city are located along the river, such as the Old Fort, Purana Qila, and the Yamuna Expressway. The river also plays a role in the city's drainage system, helping to manage floodwaters and maintain water levels.
While other rivers like the Ganga, Sutlej, and Tapti are significant in their respective regions, they do not flow through Delhi and thus do not have the same direct impact on the city's water supply, culture, and ecology. The Ganga, for instance, is a major river in northern India but does not directly support Delhi's water needs. The Sutlej is a major river in Punjab and Himachal Pradesh, and the Tapti flows through western India, neither of which have any direct connection to Delhi.
In conclusion, the Yamuna River is the lifeline of Delhi due to its historical, cultural, and ecological significance, making it the correct answer to the question.