Page No: 93
1. Choose the right answer from the four alternatives given below.
(i) Which one of the following states of India experiences floods frequently?
(b) West Bengal
(d) Uttar Pradesh
► (c) Assam
(ii) In which one of the following districts of Uttaranchal did Malpa Landslide
disaster take place?
► (d) Pithoragarh
(iii) Which one of the following states receives floods in the winter months?
(b) West Bengal
(d) Tamil Nadu
► (d) Tamil Nadu
(iv) In which of the following rivers is the Majuli River Island situated?
► (b) Brahmaputra
(v) Under which type of natural hazards do blizzards come?
► (a) Atmospheric
2. Answer the following questions in less than 30 words.
(i) When can a hazard become a disaster?
A hazard can become a disaster when it becomes active. A disaster causes losses to property and life on a large scale.
(ii) Why are there more earthquakes in the Himalayas and in the north-eastern region of India?
The Indian plate is moving at a speed of one centimetre per year towards the north and northeastern direction and the movement of plates is being constantly obstructed by the Eurasian plate from the north. This result in accumulation of energy at different points of time. Excessive accumulation of energy results in building up of stress, which ultimately leads to the breaking up of the lock and the sudden release of energy causes earthquakes in the Himalayas and in the north-eastern region of India
(iii) What are the basic requirements for the formation of a cyclone?
The basic requirements for the formation of a cyclone are:
(iv) How are the floods in Eastern India different from the ones in Western India?
The flood occur more in Eastern India as compared to Western India because of high rainfall in eastern India than western India. Also, the floods of eastern India are more disastrous in comparison to western India.
(v) Why are there more droughts in Central and Western India?
Central and Western India experiences less rainfall because the intensity of monsoon winds becomes weak as they reach in these areas.
3. Answer the following questions in not more than 125 words.
(i) Identify the Landslide-prone regions of India and suggest some measures to mitigate the disasters caused by these.
The Landslide-prone regions of India are:
Some measures to mitigate the disasters are:
(ii) What is vulnerability? Divide India into natural disaster vulnerability zones based on droughts and suggest some mitigation measures.
Vulnerability means the risk becoming victim to the disaster.
On the basis of severity of droughts, India is divided into following regions:
Some mitigation measures are:
(v) When can developmental activities become the cause of disasters?
There are many times when developmental activities carried by human beings that are directly responsible for disasters.
Bhopal Gas tragedy, Chernobyl nuclear disaster, wars, release of CFCs (Chlorofluorocarbons) and increase of green house gases, environmental pollutions like noise, air, water and soil are some of the disasters which are created due to developmental activities done by humans.
There are some other activities of human beings that accelerate or intensify disasters indirectly. Landslides and floods due to deforestation, unscientific land use and construction activities in fragile areas are some of the disasters that are the results of indirect human actions.
The human-made disasters have increased both in their numbers and magnitudes over the years and serious efforts are necessary are on at various levels to prevent and minimise their occurrences.