Mention two different ways by which modern methods of irrigation are an improvement over the primitive methods.
Large quantities of water can be easily lifted from a tube well with the help of an electric motor or a diesel engine which is not possible in the case of an ordinary well.
i. Name two cities in India which have grown rapidly due to in -migration.
ii. What are the two factors that led to the decreasing growth rate of population from 1981 to 2001 ?
The dependency ratio is higher in rural areas than in UIrban areas. Give two reasons to explain why.
i. What is meant by variability of rainfall ?
ii. How does this variability affect agriculture ?
Give a reason for each of the following :
i. Delhi has rain in December - January.
ii. Kolkata has a little rain in Apri.