15. It is an irrigation system where water is applied and distributed by gravity over the surface of the soil. a. basin irrigation c. sprinkler irrigation b. drip or trickle irrigation d. surface irrigation


16. Which is the benefit for drip irrigation? a. Must have a drainage system.
b. There is high pressure system.
c. Weeds can be grown in the area.
d. Water is used directly on the crop.


17. What irrigation system is good for the rice crop?
a. basin irrigation system
c. drip or trickle irrigation
b. border irrigation system
d. furrow irrigation system

18. Why is irrigation important?
a. It supplies crops with nutrients.
b. It supplies crops with fertilizer.
c. It supplies crops with sunlight.
d. It supplies crops with water in their amounts and is required at the time. of what?​