Why do farms need irrigation systems?

Answer: Rainfall is insufficient or unreliable

Rainfall is insufficient or unreliable ✓ — Correct! Many farming regions don't receive enough rainfall, or rain comes at the wrong times. Irrigation provides consistent, controlled water supply during critical growth periods. Reliable water is important for maximizing yields.

Irrigation is cheaper than rainwater — Wrong. Irrigation is expensive—requires infrastructure, energy to move water, and sometimes water rights. It's used out of necessity, not cost savings. Rainfall is free.

Crops cannot absorb rainwater — Wrong. Crops readily absorb rainwater through roots. Irrigation is needed when there's insufficient rain, not because crops prefer irrigated water.