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NCERT Solutions for Class 11 Geography (India Physical Environment) Chapter 7 Natural Hazards and Disasters

by aglasem
August 29, 2021
in 11th Class
Reading Time: 1 min read
0
NCERT Solutions

NCERT Solutions Class 11 Geography (India Physical Environment) Chapter 7 Natural Hazards and Disasters – Here are all the NCERT solutions for Class 11 Geography (India Physical Environment) Chapter 7. This solution contains questions, answers, images, explanations of the complete chapter 7 titled  Of Natural Hazards and Disasters taught in Class 11. If you are a student of Class 11 who is using NCERT Textbook to study Geography (India Physical Environment), then you must come across chapter 7 Natural Hazards and Disasters After you have studied the lesson, you must be looking for answers of its questions. Here you can get complete NCERT Solutions for Class 11 Geography (India Physical Environment) Chapter 7 Natural Hazards and Disasters in one place.

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NCERT Solutions Class 11 Geography Chapter 7 Natural Hazards and Disasters

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Here on AglaSem Schools, you can access to NCERT Book Solutions in free pdf for Geography for Class 11 so that you can refer them as and when required. The NCERT Solutions to the questions after every unit of NCERT textbooks aimed at helping students solving difficult questions.

For a better understanding of this chapter, you should also see summary of Chapter 7 Natural Hazards and Disasters , Geography, Class 11.

Class 11
Subject Geography
Book India Physical Environment
Chapter Number 7
Chapter Name

Natural Hazards and Disasters

NCERT Solutions Class 11 Geography chapter 7 Natural Hazards and Disasters

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Class 11, Geography chapter 7, Natural Hazards and Disasters solutions are given below in PDF format. You can view them online or download PDF file for future use.

Natural Hazards and Disasters Download

NCERT Solutions for Class 11 Geography (India : Physical Environment) Chapter 7 Natural Hazards and Disasters Download

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Question & Answer

Q.1: Choose the right answer from the four alternatives given below.
(i) Which one of the following states of India experiences floods frequently?
(a) Bihar
(b) West  Bengal
(c) Assam
(d) Uttar  Pradesh


(ii) In  which  one  of  the  following  districts  of  Uttaranchal  did  Malpa  Landslide disaster  take  place?
(a) Bageshwar
(b) Champawat
(c) Almora
(d) Pithoragarh


(iii) Which one of the following states receives floods in the winter months?
(a) Assam
(c) Kerala
(b) West  Bengal
(d) Tamil  Nadu


(iv) In which of the following rivers is the Majuli River Island situated?
(a) Ganga
(b) Brahmaputra
(c) Godavari
(d) Indus


(v) Under which type of natural hazards do blizzards come?
(a) Atmospheric
(b) Aquatic
(c) Terrestrial
(d) Biological

Ans : (i) (c) Assam (ii) (d) Pithoragarh (iii) (d) Tamil Nadu (iv) (b) Brahmaputra (v) (a) Atmospheric

Q.2: Answer the following questions in less than 30 words.
(i) When  can  a  hazard  become  a  disaster?
(ii) Why  are  there  more  earthquakes  in  the  Himalayas  and  in  the  north-eastern region of India?
(iii) What are the basic requirements for the formation of a cyclone?
(vi) How are the floods in Eastern India different from the ones in Western India?
(v) Why are there more droughts in Central and Western India?

Ans : (i) A hazard can become a disaster when it becomes active. A disaster causes losses to property and life on a large scale. (ii) 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) The basic requirements for the formation of a cyclone are:

  • Large and continuous supply of warm and moist air that can release enormous latent heat.
  • Strong Coriolis force that can prevent filling of low pressure at the centre.
  • Unstable condition through the troposphere that creates local disturbances around which a cyclone develops.
  • Absence of strong vertical wind wedge, which disturbs the vertical transport of latent heat. (iv) 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) Central and Western India experiences less rainfall because the intensity of monsoon winds becomes weak as they reach in these areas.
  • Q.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.
    (ii) What  is  vulnerability?  Divide  India  into  natural  disaster  vulnerability  zones based  on  droughts  and  suggest  some  mitigation  measures.
    (iii) When  can  developmental  activities  become  the  cause  of  disasters?

    Ans : (i) The Landslide-prone regions of India are:

    • Young mountainous areas in the Himalayas and Andaman and Nicobar.
    • High rainfall regions with steep slopes in the Western Ghats and Nilgiris.
    • The north-eastern regions.
    • Trans-Himalayan areas of Ladakh and Spiti (Himachal Pradesh)
    • Undulated yet stable relief and low precipitation areas in the Aravali
    • Rain shadow areas in the Western and Eastern Ghats and Deccan plateau.
    • Landslides due to the mining and subsidence are most common in the states like Jharkhand, Orissa, Chhattisgarh, Madhya Pradesh, Maharashtra, Andhra Pradesh, Karnataka etc. Some measures to mitigate the disasters are:
    • Restriction on the construction and other developmental activities such as roads and dams, limiting agriculture to valleys.
    • Areas with moderate slopes, and control on the development of large settlements in the high vulnerability zones, should be enforced.
    • Terrace farming should be encouraged in the northeastern hill states where Slash and Burn/Shifting Cultivation Is still prevalent.
    (ii) Vulnerability means the risk becoming victim to the disaster.On the basis of severity of droughts, India is divided into following regions:
    • Extreme Drought Affected Areas: Most parts of Rajasthan, particularly areas to the west of the Aravali hills, i.e. Marusthali and Kachchh regions of Gujarat. Included here are also the districts like Jaisalmer and Barmer from the Indian desert that receive less than 90 mm average annual rainfall.
    • Severe Drought Prone Area: Parts of eastern Rajasthan, most parts of Madhya Pradesh, eastern parts of Maharashtra, interior parts of Andhra Pradesh and Karnataka Plateau, northern parts of interior Tamil Nadu and southern parts of Jharkhand and interior Odisha are included in this category.
    • Moderate Drought Affected Area: Northern parts of Rajasthan, Haryana, southern districts of Uttar Pradesh, the remaining parts of Gujarat, Maharashtra except Konkan, Jharkhand and Coimbatore plateau of Tamil Nadu and interior Karnataka are included in this category.
    The remaining parts of India can be considered either free or less prone to the drought. Some mitigation measures are:
    • Identification of groundwater potential in the form of aquifers.
    • Transfer of river water from the surplus to the deficit areas.
    • Planning for inter-linking of rivers and construction of reservoirs and dams.
    • Remote sensing and satellite imageries can be useful in identifying the possible river-basins that can be interlinked and in identifying the ground water potential.
    (iii) 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 greenhouse 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 intensi#y 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.

    NCERT / CBSE Book for Class 11 Geography

    You can download the NCERT Book for Class 11 Geography in PDF format for free. Otherwise you can also buy it easily online.

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