Climate Questions and Answers Class 9

NCERT Solutions for Class 9 Social Science Geography Contemporary India Chapter 4 Climate Questions and Answers for Class 9. In this article, you will find Questions and Answers of Intext and Exercise. if you found anything wrong, Please comment below!

NCERT Solutions for Class 9 Social Science Geography Chapter 4 Climate Questions and Answers

Q1. Why do the houses in Rajasthan have thick walls and flat roofs?

Ans : 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 (water harvesting).

Q2. Why is it that the houses in the Terai region and in Goa and Mangalore have sloping roofs?

Ans : The houses in the Terai region, Goa, and Mangalore have sloping roofs so that the rainwater due to heavy rains in these areas flows off the roof.

Q3. Why are homes in Assam built on stilts?

Ans : The houses are built on stilts in Assam as there is a danger of floods and wild animals in large areas of Assam.

Q4. Why are most of the world’s deserts located in the western margins of continents in the subtropics? 

Ans : Sometimes the presence of cold coastal water can contribute to the creation of a desert along the adjoining shore. This occurs because cold ocean currents tend to stabilize the air over the coast and inhibit cloud formation. Large western coastal deserts include the Atacama Desert in Chile and the Namib Desert in Namibia.


Q1. Choose the right answer from the four alternatives given below.

(i) Which of the following places receives the highest rainfall in the world? 

(a) Silchar                        

(b) Mawsynram   

(c) cherrapunji            

(d) Guwahati

Ans : Mawsynram

(ii) The wind blowing in the Northern plains in summer is known as: 

(a) Kaal Baisakhi               

(b) Loo      

(c) Trade winds                        

(d) None of the above 

Ans : Loo 

(iii) Which one of the following causes rainfall during winters in the North-Western part of India.

(a) Cyclonic depression    

(b) Retreating monsoon

(c) Western disturbances  

(d) Southwest monsoon 

Ans : Cyclonic depression 

(iv) Monsoon arrives in India approximately in:

(a) Early May                     

(b) Early July 

(c) Early June                    

(d) Early August

Ans : Early June

(v) Which one of the following characterizes the cold-weather season in India?

(a) Warm days and warm nights

(b) Warm days and cold nights 

(c) Cool days and cold nights 

(d) Cold days and warm nights 

Ans : Cool days and cold nights 

Q2. Answer the following questions briefly.

(i) What are the controls affecting the climate of India?

Ans : The controls which affect the climate are:- 

temperature, atmospheric pressure, wind, humidity, and precipitation.

(ii) Why does India have a monsoon type of climate?

Ans: India is defined as a climatic region with a monsoon climate. It is strongly influenced by the monsoon winds 

(iii) Which part of India experiences the highest diurnal range of temperature and why?

Ans : The Thar Desert has a wide difference between day and night temperatures. There is no sea around to moderate the range of variation of temperatures during day and night.

 (iv) Which winds account for rainfall along the Malabar Coast

Ans : Malabar Coast gets rains from depressions and cyclones.

(v) What are jet streams and how do they affect the climate of India? 

Ans : 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 the October-November months.

(vi) Define monsoons. What do you understand by “break in monsoon”?

Ans : Monsoon refers to the seasonal reversal in the wind direction. Monsoon ‘break’ 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. They are interspersed with rainless intervals.

(vii) Why is the monsoon considered a unifying bond?

Ans : Monsoons are uncertain but all the same they act as a unifying force on the climatic unity of India. July and August are wet almost all over the country. In spite of their vagaries, the Monsoons have a very important place in the cultural life of the people.

There is so much poetry and music that centers around the rain. All over northern parts of India festivals like Varsha Mangal and special songs for the seasons.

For the farmers, the rain brings prosperity. The Indian landscape, its fauna, flora, and its agriculture all revolve around the monsoon phenomenon. The arrival of rain was eagerly awaited.

Q3. Why does the rainfall decrease from the east to the west in Northern India?

Ans : From June onwards, there is continued low pressure over the north-west region. This attracts trade winds from the Indian Ocean. The winds are trapped by air circulation over India.

These winds are loaded with abundant water vapours. The winds blow at a very fast speed. The hilly ranges of the northeast account for heavy rainfall in the region. As these winds travel westwards the amount of moisture contained goes on depleting. There is as such a decrease in rainfall from east to west in northern India.

Q4. Give reasons as to why.

(i) Seasonal reversal of wind direction takes place over the Indian subcontinent?

Ans : With the reversal in the direction of the surface winds, the monsoons withdraw from the Northern Plains. This reversal occurs as the monsoon trough becomes weaker with the approach of the winter months.

(ii) The bulk of rainfall in India is concentrated over a few months.

Ans : The bulk of rainfall is concentrated over the months of June-September. As winter approaches. there is a reversal in the direction of surface winds and monsoons withdrawing from the Northern Plains.

(iii) The Tamil Nadu coast receives winter rainfall.

Ans : Winter rains in Tamil Nadu are caused by north-east trade winds (also known as north-east monsoons). That is the only part of India that gets rain during the winter months.

(iv) The delta region of the eastern coast is frequently struck by cyclones.

Ans : With the onset of winter, there is a shift in low-pressure conditions from the northwestern plains to the Bay of Bengal. During the middle of November, this shift results in the occurrence of cyclones. The deltas of Krishna and Kaveri rivers (and also Bangladesh) have to bear the fury of these cyclones year after year.

(v) Part of Rajasthan Gujarat and the leeward side of the Western Ghats are drought-prone.

Ans : Rainfall in India is influenced by location as well as relief features. Areas situated in the direction of the monsoon winds receive more rainfall. The rainfall continues to decrease from east to west. The moisture content of the monsoons goes on decreasing as they move westward Areas situated in the extreme west and devoid of hilly ranges that intercept the monsoon remain drought-prone.

Q5. Describe the regional variation in the climatic conditions of India with the help of suitable examples.

Ans : There are wide variations in climatic conditions over different parts of the country. Most parts of the country have dry winters. The Coromandel coastal areas are an exception. Winters are severe in the north. The temperature increases from north to south.

As the Northern Plains shiver with 10-15 degrees Celsius temperature, Chennai has a temperature around 25 degrees Celsius. Higher slopes of the Himalayas experience snowfall. The peninsular region does not have a well-defined cold season. Nearness to the sea ensures that there are no wide variations due to seasonal changes.

Rainfall may go up to 1080 mm in the Khasi hills. Rajasthan and parts of Gujarat remain prone to droughts. During the summer seasons, temperatures go up to 48° C in the western parts of India. May is the season of the loo. These hot and dry winds cause intense heat.

Temperature variations (June-December) are minimal at places like Leh, Places in the Northern Plains experience severe heat in the summers and extreme cold weather during the winter months.

Q6. Discuss the mechanism of the monsoon.

Ans : The north-east trade winds that blow during the winter months get replaced as the summer season sets in. There is continued low pressure over the north-west region. This attracts trade winds from the Southern Hemisphere. Coming from the Indian Ocean, these winds cross over the Bay of Bengal and the Arabian Sea.

They are then trapped by air circulation taking place over India. These winds are loaded with moisture and blow at a very fast speed. The rain caused by the south-west monsoon is not uniform. The areas of Western Ghats situated in the direction of the winds get more rainfall than the other side.

The cyclonic depressions formed at the head of the Bay of Bengal cause uneven and uncertain distribution of rainfall. These depressions move towards the low-pressure monsoon trough which is not steadily placed. For a variety of reasons, they move northwards or southwards.

When the axis of the trough moves close to the Himalayas, there are heavy rains in the Himalayan regions. The plains get dry spells. With the approach of winter, the monsoon trough becomes weaker. There is a reversal in the direction of surface winds with the approach of winter.

The monsoons now withdraw from the Northern Plains. The shift in the low-pressure conditions from north-western plains to the Bay of Bengal causes cyclones and rains on the Coromandel Coast.

Q7. Give an account of weather conditions and characteristics of the cold season.   

Ans : The winter season lasts from the month of December to February. The season is mostly dry. Cold is severe in the northern parts of the country. The southern parts have only a mild cold. In the Northern Plains, the days may be generally warm but the nights are cold where places situated at high altitudes have snowfall.

Light rainfall may occur during the winter months caused by western disturbances. These Disturbances are caused by shallow cyclonic depressions originating over the eastern Mediterranean Sea. Travelling eastward, these depressions reach the north-western parts of India.

On their way, they get loaded with moisture from the Caspian Sea and the Persian Gulf. The western disturbances are responsible for snowfall in the western Himalayan regions apart from light rains over north-western parts of the country. Winter rains are often followed by cold waves. Tamil Nadu gets rain in winter from the northeast trade winds.

Q8. Give the characteristics and effects of the monsoon rainfall in India. 

Ans : The characteristic is, the monsoon starts in India from early June to mid-September in between 100 to 120 days.

The effects of the monsoon rainfall in India is, around the time of the monsoon arrival the normal rainfall increases suddenly and continues constantly for several days or weeks. This is known as the ‘burst’ of the monsoon and can be distinguished from the pre-monsoon showers.

Map Skills 

On an outline map of India, show the following. 

(i) Areas receiving rainfall over 400 cm. 

Ans : Mawsynram is a village in Meghalaya that receives a rainfall of over 400 cm.

(ii) Areas receiving less than 20 cm of rainfall. 

Ans : Areas that receive less than 20 cm of rainfall in India are:- the Thar desert, Rajasthan, Punjab, Kashmir, and Deccan plateau.

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