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 ?
Mention four effects of a rapidly growing population on development.
i. In under developed countries, rapid growth of population diminishes the availability of capital per head which reduces the productivity of its labour force.
ii. A rapidly growing population increases the requirements of demographic investment which at the same time reduces the capacity of the people to save.
iii. A rapidly growing population leads to a progressive decline in the availability of capital per worker. This further leads to lower productivity and diminishing returns.
iv. The rapidly rising population makes it almost impossible for economically backward countries to solve their problem of unemployment.
The dependency ratio is higher in rural areas than in UIrban areas. Give two reasons to explain why.
Mention two different ways by which modern methods of irrigation are an improvement over the primitive methods.