The water from these rivers irrigates the agricultural lands and rains the Himalayas block the rain-bearing monsoon winds from reaching Asia, causing them to fall in India. In India, monsoons are the primary source of water for irrigation. In many parts of India, its failure results in drought and starvation. It ensures the country's food security and produces a variety of industrial raw materials. As a result, agricultural development is a must for our country's prosperity. Agriculture, along with its related industries, is India's most important source of income. The great plain of north India has been described as a gift from the Himalayas. The fertile soils brought about by the Himalayas have promoted agriculture in the plains. Several crops are grown and, in turn, provided food for the farmers. The Himalayas have a significant impact on India's climate. Only the presence of the Himalayas makes India a monsoon land. It traps the monsoon winds from the Arabian Sea and the Bay of Bengal, forcing them to shed their moisture content within the Indian subcontinent in the form of snow and rain. Himalayas acts as barrier for moisture laden monsoon winds and they also protect Indian Subcontinent from cold winds from Central Asia and Siberia. The factors affecting the Climate of India are Pressure and Wind Systems, Altitude, Relief Features, Latitude, Ocean Currents, and Distance from the Sea.
Our book on "Climate Change Modelling for Local Adaptation in the Hindu Kush - Himalayan Region" https://books.emeraldinsight.com/page/detail/climate-change-modelling-for-local-adaptation-in-the-hindu-kush-himalayan-region/?k=9781780524863 has a chapter on India.
From an economic point of view, agriculture is of great importance in India, in order to provide hard currency that serves the Indian global market by filling a large part of the global need for the rice crop, in addition to cultivating tea, whose products are almost flooding the global market, and it is one of the finest types of tea.
From a natural point of view, the extension of these mountain ranges stands in the way of the passage of air currents, which makes them pour all the rain they carry in the regions of India, and this made agriculture in some regions of India throughout the year.