Explanation: The Nagarjuna Sagar Dam, located on the Krishna River in Andhra Pradesh, is a significant multipurpose project that was constructed primarily to support the Green Revolution in India. The Green Revolution, which began in the 1960s, was a period of significant agricultural growth and modernization in India, characterized by the introduction of high-yielding varieties of seeds, the use of chemical fertilizers, and improved irrigation techniques.
The Nagarjuna Sagar Dam was a crucial component of this agricultural development. It was built to provide irrigation to vast areas of farmland, which was essential for the cultivation of high-yielding crop varieties. The dam's reservoir, Nagarjuna Sagar Lake, stores a large volume of water that can be used for irrigation during the dry seasons, ensuring a consistent water supply for crops. This irrigation support was vital for the success of the Green Revolution, as it allowed farmers to grow multiple crops per year, increasing agricultural productivity and food production.
In addition to irrigation, the Nagarjuna Sagar Dam also serves as a significant source of hydroelectric power. The dam's power plant generates electricity, which is used to electrify rural areas and support agricultural activities such as pumping water for irrigation. This dual purpose of providing both irrigation and power made the Nagarjuna Sagar Dam a key infrastructure project that directly contributed to the success of the Green Revolution in Andhra Pradesh and the surrounding regions.
It is important to note that the other options provided in the question are unrelated to the primary purpose of the Nagarjuna Sagar Dam. The Red Revolution refers to the growth of the Communist Party in India, the Yellow Revolution pertains to the increase in edible oil production, and the Black Revolution is associated with coal production. None of these movements or developments are directly connected to the construction and purpose of the Nagarjuna Sagar Dam.
In summary, the Nagarjuna Sagar Dam was constructed to support the Green Revolution in India by providing essential irrigation and hydroelectric power, which were critical for increasing agricultural productivity and modernizing farming practices in the region.