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.
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. Birth rates are higher in the rural areas.
ii. Large number of adults migrate from rural areas to urban areas in search of Job and better facilities of life.
Mention two different ways by which modern methods of irrigation are an improvement over the primitive methods.