NCERT 9th Geography Chapter 4, class 9 Geography chapter 4 solutions<\/p>\n\n\n\n
Page No: 27<\/p>\n\n\n\n
1. Find out why the houses in Rajasthan have thick walls and flat roofs.<\/strong><\/p>\n\n\n\n Answer<\/strong><\/p>\n\n\n\n Houses in Rajasthan have thick walls and flat roofs. The thick walls do not allow the heat to get into the houses while the flat roofs help to retain the little water that comes as rain in the desert.<\/p>\n\n\n\n 2. Find out why is it that the houses in the Tarai region and in Goa and Mangalore have sloping roofs.<\/strong><\/p>\n\n\n\n Answer<\/strong><\/p>\n\n\n\n The Tarai region, Goa and Mangalore receive heavy rains during monsoon seasons thus the houses have sloping roofs so that the rainwater flows off the roof.<\/p>\n\n\n\n 3. Why are houses in Assam built on stilts?<\/strong><\/p>\n\n\n\n Answer<\/strong><\/p>\n\n\n\n The houses are built on stilts in Assam as there is danger of floods and wild animals in large areas of Assam.<\/p>\n\n\n\n 4. Why most of the world\u2019s deserts are located in the western margins of continents in the subtropics?<\/strong><\/p>\n\n\n\n Answer<\/strong><\/p>\n\n\n\n Most of the world\u2019s deserts are located in the western margins of continents in the subtropics because trade winds that blow in the region shed their moisture on the eastern side.They become dry by the time they reach the western margin of the continent. Cold ocean currents also tend to stabilise the air over the coast and inhibit cloud formation.<\/p>\n\n\n\n Page No: 39<\/p>\n\n\n\n Excercise<\/strong><\/p>\n\n\n\n 1. Choose the right answer from the four alternatives given below :<\/strong> (ii) The wind blowing in the northern plains in summers is known as: (iii) Which one of the following causes rainfall during winters in northwestern part of India? (b) Retreating monsoon (d) Southwest monsoon<\/strong><\/p>\n\n\n\n \u25ba (a) Cyclonic depression<\/p>\n\n\n\n (iv) Monsoon arrives in India approximately in: (v) Which one of the following characterises the cold weather in India? (b) Warm days and cold nights (d) Cold days and warm nights<\/strong><\/p>\n\n\n\n \u25ba (b) Warm days and cold nights<\/p>\n\n\n\n 2. Answer the following questions briefly.<\/strong> Answer<\/strong><\/p>\n\n\n\n (i) The elements affecting the climate are Latitude, Altitude and Pressure & Winds, distance from the sea (continentality), ocean currents and relief features.<\/p>\n\n\n\n (ii) India have a monsoon type of climate because the climate of India is governed by the monsoon winds which are limited between 20\u00b0 North and 20\u00b0 South.<\/p>\n\n\n\n (iii) The Indian desert located in the north-western part of India experience the highest diurnal range of temperature because of the sand present there quickly becomes hot during day and cools down rapidly during night.<\/p>\n\n\n\n (iv) Malabar Coast gets rains from South-West Monsoon Winds.<\/p>\n\n\n\n (v) Jet streams are high velocity westerly winds blowing through a narrow zone in the upper troposphere. The westerly flows are responsible for the western disturbances experienced in the north and north-western parts of the country. The easterly jet streams cause tropical depressions during the monsoon as well as October-November months.<\/p>\n\n\n\n (vi) Monsoon refers to the seasonal reversal in the wind direction. Monsoon \u2018break\u2019 refers to the happening of wet and dry spells during the rainy season. The monsoon rains take place only for a few days at a time.<\/p>\n\n\n\n (vii) The monsoon is considered a unifying bond because: \u2192 The river valleys which carry this water also unite as a single river valley unit.<\/p>\n\n\n\n 3. Why does the rainfall decrease from the east to the west in Northern India.<\/strong><\/p>\n\n\n\n Answer<\/strong><\/p>\n\n\n\n The Bay of Bengal branch of south-west monsoon moves towards northeast carrying more moisture and they give heavy rainfall in this region. As they move further towards west, they carry less moisture content with themselves resulting in decrease in rainfall in the west.<\/p>\n\n\n\n NCERT 9th Geography Chapter 4, class 9 Geography chapter 4 solutions<\/p>\n\n\n\n 4. Give reasons as to why :<\/strong> (iv) The delta region of the eastern coast is frequently struck by cyclones.<\/strong><\/p>\n\n\n\n (v) Parts of Rajasthan, Gujarat and the leeward side of the Western Ghats are drought-prone.<\/strong><\/p>\n\n\n\n Answer<\/strong><\/p>\n\n\n\n (i) Seasonal reversal of wind direction over the Indian subcontinent takes place due to pressure differential. El Nino has major role to play in the seasonal reversal of wind direction over the Indian subcontinent.<\/p>\n\n\n\n (ii) The monsoon begins from the first week of June and advances quite rapidly to cover almost the whole country by mid-July. Hence, the bulk of rainfall in India concentrated over the months of a few months; mainly June to August.<\/p>\n\n\n\n (iii) The Tami Nadu coast receives winter rainfall because of movement of low-pressure conditions to the Bay of Bengal.<\/p>\n\n\n\n (iv) The Bay of Bengal is the centre of various pressure changes and hence there is always a chance of development of cyclone. Due to this, the delta region of the eastern coast is frequently struck by cyclones.<\/p>\n\n\n\n (v) The parts fall in the rain shadow area of the Aravalli. Hence, they are drought prone as they don’t receive much of rainfall.<\/p>\n\n\n\n 5. Describe the regional variations in the climatic conditions of India with the help of suitable examples.<\/strong><\/p>\n\n\n\n Answer<\/strong><\/p>\n\n\n\n There is regional variation in the climatic conditions of India. Temperature and Precipitation vary from place to place and season to season. 6. Discuss the mechanism of monsoons.<\/strong><\/p>\n\n\n\n Answer<\/strong><\/p>\n\n\n\n Following are the factors responsible for the mechanism of monsoon: 7. Give an account of weather conditions and characteristics of the cold season.<\/strong><\/p>\n\n\n\n Answer<\/strong><\/p>\n\n\n\n Following are the features of the cold season: 8. Give the characteristics and effects of the monsoon rainfall in India.<\/strong><\/p>\n\n\n\n Answer<\/strong><\/p>\n\n\n\n Characteristics of the monsoon rainfall in India: Effects of the monsoon rainfall in India: NCERT 9th Geography Chapter 4, class 9 Geography chapter 4 solutions<\/p>\n\n\n\n Map Skills<\/strong><\/p>\n\n\n\n On an outline map of India, show the following. Answer<\/strong><\/p>\n\n\n\n NCERT 9th Geography Chapter 4, class 9 Geography chapter 4 solutions<\/p>\n\n\n\n NCERT Solutions for 9th Class Geography : Chapter 4-Climate<\/p>\n\n\n\n Download PDF<\/strong>: NCERT Solutions for 9th Class Geography : Chapter 4-Climate PDF<\/a><\/p>\n\n\n\n The National Council of Educational Research and Training is an autonomous organization of the Government of India which was established in 1961 as a literary, scientific, and charitable Society under the Societies Registration Act. Its headquarters are located at Sri Aurbindo Marg in New Delhi. Visit the Official NCERT website<\/a> to learn more. <\/p>\n\n\n\n
(i) Which of the following places receives the highest rainfall ?
(a) Guwahati
(b) Mawsynram
(c) Kolkata
(d) None of these<\/strong>
\u25ba (b) Mawsynram<\/p>\n\n\n\n
(a) Kaalbaisakhi
(b) Loo
(c) Trade winds
(d) None of the above<\/strong>
\u25ba (b) Loo<\/p>\n\n\n\n
(a) Cyclonic depression <\/strong><\/p>\n\n\n\n
(c) Western disturbances <\/strong><\/p>\n\n\n\n
(a) Early May
(b) Early July
(c) Early June
(d) Early August<\/strong>
\u25ba (c) Early June<\/p>\n\n\n\n
(a) Warm days and warm nights <\/strong><\/p>\n\n\n\n
(c) Cool days and cold nights <\/strong><\/p>\n\n\n\n
(i) What are the controls affecting the climate of India?
(ii) Why does India have a monsoon type of climate?
(iii) Which part of India does experience the highest diurnal range of temperature and why?
(iv) Which winds account for rainfall along the Malabar coast?
(v) What are Jet streams and how do they affect the climate of India?
(vi) Define monsoons. What do you understand by \u201cbreak\u201d in monsoon?
(vii) Why is the monsoon considered a unifying bond?<\/strong><\/p>\n\n\n\n
\u2192 The Indian landscape, its flora and fauna, etc. are highly influenced by the monsoon.
\u2192 These monsoon winds bind the whole country by providing water for agricultural activities
\u2192 Most of the festivals in India that are related to agricultural cycle may be known by different names in different parts of the country, but their celebration is decided by the monsoon.
\u2192 Year after year, people of India from north to south and from east to west, eagerly await the arrival of the monsoon.<\/p>\n\n\n\n
(i) Seasonal reversal of wind direction takes place over the Indian subcontinent.
(ii) The bulk of rainfall in India is concentrated over a few months.
(iii) The Tamil Nadu coast receives winter rainfall<\/strong>.<\/p>\n\n\n\n
\u2192 In summers the temperature rises up to 50\u00b0C in parts of Rajasthan, whereas it may be around 20\u00b0C in Pahalgam in Kashmir.
\u2192 In winters night temperature in Drass in Kashmir may be minus 45\u00b0C, whereas in Tiruvanantapuram in Kerala may have a temperature of 20\u00b0C.
\u2192 In Andaman Islands the difference between day and night temperature may be hardly 7\u00b0 – 8\u00b0C.
\u2192 Coastal areas experience less contrast in the temperature, whereas seasonal contrasts are more in the interior of the country.
\u2192 There is decrease in rainfall generally from east to west in the northern plains.
\u2192 Most part of India recieve rainfall from June \u2013 September, whereas some parts like the Tamil Nadu coast gets a large portion of its rain during October and November.<\/p>\n\n\n\n
\u2192 The differential heating and cooling of land and water creates low pressure on the landmass of India while the seas around experience comparatively high pressure.
\u2192The Inter Tropical Convergence Zone (ITCZ) is normally positioned about 5\u00b0N of the equator. It shifts over the Ganga plains during summer. It is also known as the monsoon trough during the monsoon season.
\u2192 The high pressure area, east of Madagascar is approximately 20\u00b0S over the Indian Ocean. This area affects the Indian Monsoon.
\u2192 The Tibetan plateau gets intensely heated during summer. This results in strong vertical air currents and formation of high pressure over the plateau. This high pressure zone is about 9 km above the sea level.
\u2192 The westerly jet stream move to the north of the Himalayas, and the tropical easterly jet stream moves over the Indian Peninsula during summer.
\u2192 The periodic change in pressure conditions between Pacific Ocean and the Indian Ocean that is known as the Southern Oscillation or SO also affects the monsoon.
\u2192 The difference in pressure over Tahiti and Darwin is computed to predict the intensity of the monsoons. Tahiti (18\u00b0S\/149\u00b0W) lies in the Pacific Ocean and Darwin (12\u00b030’S\/131\u00b0E) lies in northern Australia. If the pressure differences are negative, it means a below average and late monsoon.<\/p>\n\n\n\n
\u2192 The winter season begins from mid-November and till February; in northern India.
\u2192 December and January are the coldest months in the northern part of India.
\u2192 The temperature ranges between 10\u00b0-15\u00b0C in the northern plains, while it ranges between 24\u00b0-25\u00b0C in Chennai.
\u2192 Days are warm and nights are cold.
\u2192 Frost is common in the north and the higher slopes of the Himalayas experience snowfall.
\u2192 The northeast trade winds prevail over the country in this season. As these winds blow from land to sea, most parts of the country experience a dry season.
\u2192 The weather is usually marked by clear sky, low temperatures and low humidity and weak variable winds.
\u2192 The inflow of the cyclonic disturbances from the west and the northwest is a characteristic feature of the cold weather over the northern plains.
\u2192 These low-pressure systems originate over the Mediterranean Sea and Western Asia and move into India. They cause winter rains over the plains and snowfall in the mountains.
\u2192 The winter rainfall is in small amount but is very important for the rabi crop. This rainfall is locally known as mahawat.
\u2192 The peninsular region does not have a well- defined cold season due to the moderating influence of the sea.<\/p>\n\n\n\n
\u2192 The duration of the monsoon varies from 100 to 120 days from early June to mid- September.
\u2192 Around the time of its arrival, the normal rainfall increase suddenly and continues regularly for several days. This is called the ‘burst’ of the monsoon.
\u2192 They are distinguished from the pre-monsoon showers because of their increase in rainfall amount and regularity.
\u2192 The monsoon arrives at the southern tip of the Indian Peninsular generally by the first week of June.
\u2192 The rainfall is unevenly distributed across the country.<\/p>\n\n\n\n
\u2192 Agriculture in India largely depends on Indian monsoons for water. Late, Low or excessive rains have a negative impact on crops.
\u2192 Due to uneven distribution of rainfall across the country, there are few places that are drought prone and few are flood affected.
\u2192 The monsoon provides India with a diverse climatic pattern. Hence, in spite of the presence of great regional variations, it has a unifying influence upon the country and its people.<\/p>\n\n\n\n
(i) Areas receiving rainfall over 400 cm.
(ii) Areas receiving less than 20 cm of rainfall.
(iii) The direction of the south-west monsoon over India.<\/strong><\/p>\n\n\n\n![\"NCERT](\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2021\/02\/geography-class-9th-chapter-4-hindi.jpg\" "\\"Ch")
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