Name the countries having the highest and the lowest sex ratio in the world.

Classify metallic minerals into two categories.

Why were all forms of transport referred to as lines of communication?

Name the two South-Asian economists, who have worked together on ‘Human Development Report’.

Which road plan was introduced to improve the conditions of roads in India after independence?

In which region are dogs and reindeer used as pack animals?

In which economic sector are both productions and exchange included?

Which type of settlements derive their basic economic needs mainly from secondary and tertiary activities?

Name the ‘Highway’ which connects the South American countries with Canada.

What is the main cause of formation of ‘urban smog’?