Raising of only one crop in a year when there is seasonal supply of water is called________?

How many crop of potato are sown annually________?

Natural antioxidant Vitamin is ________?

Art of making saline un-cultivable lands capable of re-cultivation is called.________?

To keep the Hydraulic structure safe against undermining the ________ should be safe?

All seem fully employed but in reality much of their time is spent in unproductive activities?