Irrigation Systems — Set 6

Correct Answer: A. To pump water from lower to higher elevation for irrigation

The correct answer is To pump water from lower to higher elevation for irrigation. An irrigation lift system uses pumps (powered by electricity, diesel, or solar) to raise water from lower elevations like rivers, canals, or wells to higher elevation fields. This system is essential in regions where gravity flow is not possible, enabling irrigation on elevated or undulating terrain. This topic is frequently tested in competitive examinations such as RRB NTPC, SSC, and UPSC.

Correct Answer: A. To maintain soil fertility and reduce pest buildup through different crop sequences

The correct answer is To maintain soil fertility and reduce pest buildup through different crop sequences. Crop rotation involves growing different crops in sequence on the same field to maintain soil fertility, break pest cycles, reduce disease pressure, and improve overall soil health. This practice reduces the need for chemical inputs and improves sustainability of agricultural systems. This topic is frequently tested in competitive examinations such as RRB NTPC, SSC, and UPSC.

Correct Answer: A. Indo-Gangetic Plain

The correct answer is Indo-Gangetic Plain. The Indo-Gangetic Plain, which includes parts of Punjab, Haryana, Uttar Pradesh, and other northern states, has the largest groundwater reserves in India due to deep alluvial deposits. However, intensive extraction has led to significant water table decline in some areas, requiring sustainable groundwater management. This topic is frequently tested in competitive examinations such as RRB NTPC, SSC, and UPSC.

Correct Answer: A. To allow water to percolate into the ground and recharge groundwater

The correct answer is To allow water to percolate into the ground and recharge groundwater. A percolation tank is a water harvesting structure designed to allow water to slowly percolate into the ground, recharging groundwater aquifers. Unlike surface reservoirs, percolation tanks focus on infiltration rather than storage, making them ideal for increasing groundwater availability in water-scarce regions. This topic is frequently tested in competitive examinations such as RRB NTPC, SSC, and UPSC.

Correct Answer: A. Evapotranspiration (ET) measurement

Evapotranspiration (ET) is the scientific method used to measure the total water requirement of crops. ET includes water lost through evaporation from soil and transpiration from plants. Understanding crop water requirements helps farmers determine optimal irrigation schedules and amounts for efficient water use.

Correct Answer: A. High energy cost for pumping water to elevated areas

The correct answer is High energy cost for pumping water to elevated areas. Lift irrigation systems require significant energy to pump water from lower elevations, making electricity or fuel costs a major challenge. Solar-powered lift systems are emerging as a sustainable alternative to reduce operational costs and promote renewable energy use in agriculture. This topic is frequently tested in competitive examinations such as RRB NTPC, SSC, and UPSC.

Correct Answer: A. Indus Valley Civilization

The correct answer is Indus Valley Civilization. The Indus Valley Civilization (3300-1300 BCE) was known for advanced irrigation and water management systems, including dams, reservoirs, canals, and wells. Archaeological evidence shows sophisticated water harvesting and irrigation infrastructure that sustained extensive agricultural production. This topic is frequently tested in competitive examinations such as RRB NTPC, SSC, and UPSC.

Correct Answer: A. To define the geographical area that can be irrigated from a specific water source

The correct answer is To define the geographical area that can be irrigated from a specific water source. An irrigation command area is the geographical region that can be irrigated from a specific irrigation project (dam, canal, or lift system). Understanding command areas helps in planning irrigation infrastructure, allocating water resources, and managing agricultural development in regions. This topic is frequently tested in competitive examinations such as RRB NTPC, SSC, and UPSC.

Correct Answer: A. To store water locally for irrigation and fish farming

The correct answer is To store water locally for irrigation and fish farming. Farm ponds are small water storage structures built on farms to collect runoff and store water for irrigation during dry periods. They also support fish farming for supplementary income, improve groundwater recharge through seepage, and reduce dependency on external water sources. This topic is frequently tested in competitive examinations such as RRB NTPC, SSC, and UPSC.

Correct Answer: A. High water wastage and low irrigation efficiency

The correct answer is High water wastage and low irrigation efficiency. Flood (or basin) irrigation has significant disadvantages including low efficiency (30-40%), high water wastage due to evaporation and runoff, uneven water distribution, and lack of water control. These drawbacks have led to adoption of more efficient irrigation methods in modern agriculture. This topic is frequently tested in competitive examinations such as RRB NTPC, SSC, and UPSC.