Which irrigation methods are listed?

• A. Flood irrigation only
• B. Sprinklers only
• C. Canals from rivers to irrigate the fields with furrow, sprinklers, drip and centre pivots
• D. Drip irrigation only

Answer: (C)

This question tests knowing that irrigation systems use a water supply network and multiple application methods. Water from rivers can be carried to fields by canals, and once there, water can be applied in several ways: furrow irrigation where water runs along trenches between rows, sprinkler irrigation where water is sprayed through sprinklers, drip irrigation delivering water directly to the root zones, and centre-pivot irrigation with a rotating sprinkler system. Because this option lists the canal delivery plus all these application methods, it best represents the range of techniques used. The other choices imply only a single method, which doesn’t capture the variety available.