Explain with examples the ‘population size’ criteria used by most countries to define urban areas.
Population size criteria used by most countries to define urban areas :
The lower limit of the population size for the settlement to be designated as urban is-
(i)1,500 in Colombia.
(ii)2,000 in Argentina and Portugal(iii)2,500 in USA and Thailand
Mention any two characteristics of sub-urbanisation.
Characteristics of sub-urbanisation :
(i) People move away from congested urban areas to cleaner areas outside the city in search of better quality of living.
(ii) Everyday thousands of people commute from their homes in the suburbs to their workplaces in the city .
Mention any two sources of water pollutants created by humans.
Sources of water pollutants created by humans :
(ii)Toxic effluents from industries
Who are called red collar workers ?
People engaged in primary activities are called Red Collar Workers.
What two factors mostly helped in the development of ancient towns in India ?
Factors mostly helped in the development of ancient towns in India:
Explain any three characteristics of clustered rural settlements of India.
Characteristics of clustered rural settlements of India :
(i)The Clustered rural settlement is a compact or closely built up area of houses.
(ii)In this type of village, the general living area is distinct and separated from the surrounding farms, barns and pastures.
(iii)The closely built-up area and its intervening streets present some recognisable pattern of geometric shape such as rectangular, radial, linear etc
How is density of population of a region calculated ?
Density of population is usually calculated in persons per sq km
Density of Population = Population /Area.
Explain the term ‘Golden Quadrilateral’.
It comprises construction of 5,846 km long 4/6 lane, high-density traffic corridor to connect India’s four big metro cities of Delhi, Mumbai, Chennai & Kolkata . With the construction of Golden Quadrilateral, the time - distance and cost of movement among the mega cities of India will be considerably minimised.
‘‘The knowledge about nature is extremely important to develop technology.’’ Support this statement by giving three examples.
Knowledge about nature is extremely important to develop technology:
(i)Understanding of concepts of friction and heat helped us discover fire.
(ii)Understanding of the secrets of DNA and genetics enabled us to conquer many diseases.
(iii)The laws of aerodynamics are used to develop faster planes.