What are the main sources of irrigation in Tamil Nadu?
A. Canals
B. Tanks
C. Wells
D. All of these

Hint: Water is a significant determinant factor in the creation of harvests in the agriculture area. Escalated and broad development of land relies mostly upon the accessibility of water. Medium and minor irrigation plans are executed in the state for enlarging the irrigation for agriculture. The different wellsprings of irrigation are trenches, tanks, tube wells, Open wells, and springs.

Complete answer: Irrigation is a crucial contribution to food security in the State of Tamil Nadu. Rice is a significant staple food, representing three-fourths of the utilization of food grains. Irrigation covers most pieces of the rice zone. In 2000, $96\% $ of rice creation was done under irrigation conditions. Groundwater adds to a significant piece of the watered territory. Nonetheless, late patterns of groundwater water use in the state show that its deliberations in numerous areas surpass the all-out net yearly revive (CGWB 2006). Generally, groundwater abuse surpasses $85\% $ of the yearly energy. Also, watered territories under tank orders, when a prevailing wellspring of irrigation in Tamil Nadu, and under waterway orders are diminishing. Furthermore, the editing and irrigation designs are changing to satisfy the expanding need for non-grain food items. Taking into account the ongoing patterns in irrigation, meeting food security in Tamil Nadu will without a doubt be a significant test. Irrigation in India incorporates an organization of major and minor channels from Indian streams, groundwater very much based frameworks, tanks, and other water-collecting anticipates for agrarian exercises. Of these groundwaters, the framework is the biggest. In 2013-14, just about $36.7\% $ of all-out rural land in India was dependably watered, and staying two-third of developed land in India is reliant on storms. $65\% $ of the irrigation in India is from groundwater. Right now about $51\% $ of the farming territory developing food grains is covered by irrigation. The remainder of the territory is reliant on precipitation which is the greater part of the occasions problematic and capricious.

Thus, option (D) is correct.

Note: Irrigation in India improves food security, diminishes reliance on storms, improves agrarian efficiency, and makes provincial openings for work. Dams utilized for irrigation ventures help produce power and transport offices, just as give drinking water supplies to a developing populace, control floods and forestall dry seasons.