Correct Answer: on the slope of hills

Solution : The correct answer is on the slope of hills.

Terrace farming is practised in the hilly areas of Uttarakhand, Himachal Pradesh, Meghalaya etc. In this mountain slopes are cut in a stair like manner and crops are sown on it. It decrease the flow of water and facilitates the growth on plant on hilly slopes. Usually vegetable crops are grown in such areas. It is the most effective and sustainable way of farming in hilly areas.