CBSE Class 9 Geography Climate Worksheet

Notes for Class 9 Climate

Very Short / Short Answer Type Questions
 

Question : What are the controls affecting the climate of India?
Answer : Latitude, Altitude and Pressure and Winds are the main factors which affect the climate of India. 

Question : Which part of India does experience the highest diurnal range of temperature and why?
Answer : Northwestern part of India experiences the highest diurnal range of temperature. This happens because of the presence of the Thar Desert and also because this region does not have the moderating influence of the ocean.

Question : What are Jet streams and how do they affect the climate of India?
Answer : Fast flowing and narrow air currents are called jet streams. The streams flow at high altitudes (about 12,000 feet) in the troposphere. The westerly jet streams are responsible for western cyclonic disturbances in the north and north-western parts of India. The subtropical westerly jet stream moves north of the Himalayas with the apparent movement of the sun. The tropical jet stream (an easterly jet stream) blows over the Indian Peninsula; approximately over 14° north during the summer months.*

Question : Why is the monsoon considered a unifying bond?
Answer : Although there are wide variations in weather patterns across India, the monsoon brings some unifying influences on India. The Indian landscape, its flora and fauna, etc. are highly influenced by the monsoon. The entire agricultural calendar in India is governed by the monsoon. Most of the festivals in India are related to agricultural cycle. These festivals may be known by different names in different parts of the country, but their celebration is decided by the monsoon. It is also said that the river valleys which carry the rainwater also unite as a single river valley unit. Due to these reasons, monsoon is often a great unifying factor in India.

Question : Give reasons as to why.
(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.
(iv) The delta region of the eastern coast is frequently struck by cyclones.
(v) Parts of Rajasthan, Gujarat and the leeward side of the Western Ghats are drought-prone.
Answer : 
(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.
(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 is concentrated over the months of a few months; mainly June to August.
(iii) The Tami Nadu coast receives winter rainfall because of movement of lowpressure conditions to the Bay of Bengal.
(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.
(v) The parts fall in the rain shadow area of the Aravalli. Hence, they are drought prone.

Question : Discuss the mechanism of monsoons.
Answer : The low-pressure condition over the northern plains intensifies by the beginning of June. It attracts the trade winds from the southern hemisphere. These southeast
trade winds cross the equator and blow in a south-westerly direction to enter the Indian peninsula as the south-west monsoon. These winds bring abundant moisture to the subcontinent.

Question : Give the characteristics and effects of the monsoon rainfall in India.
Answer : Monsoon tends to have ‘breaks’ in rainfall; which means that there are wet and dry spells in between. The monsoon is famous for its uncertainties. It may cause heavy floods in one part of the country, and may be responsible for droughts in other part. Because of its uncertain behaviour, it sometimes disturbs the farming schedule in India. This affects millions of farmers all over the country.

Question 1: What are the elements of climate and weather?

Question 2: Distinguish between climate and weather:

Question 3: What does the term monsoon mean?

Question 4: Describe briefly the regional variations in the climatic conditions of India with the help of suitable examples:

Question 5: Name six major controls of the climate of any place:

Question 6: What is the impact of India’s latitudinal extent on is climate?

Question 7: Describe the conditions related to atmospheric pressure and surface winds prevailing over India during winters and summers:

Question 8: What is Ferrel’s law?

Question 9: Why most of the world’s deserts are located in the western margins of continents in the subtropics?

Question 10: What are jet streams? How do they affect the climate of India?

Question 11: Explain the mechanism of monsoon:

Question 12: What is southern oscillation?

Question 13: What is the burst of monsoon?

Question 14: Describe the important features of the cold weather season:

Question 15: Describe the path of south west monsoons over Indian subcontinent:

Question 16: Which parts of India receive high rainfall and why?

Question 17: Explain the reason for the breaks in the monsoon rainfall: What is its impact?

Question 18: Describe main features of retreating monsoon:

Question 19: What are tropical cyclones?

Question 20: Describe the distribution of rainfall in India:

Question 21: Why does western Rajasthan receive low rainfall?

Question 22: Explain the unifying influence of the monsoon on the Indian sub-continent:

Question 23: Map work:- a: Distribution of rainfall

b: Area affected by the western disturbances

c: Areas receiving north-east monsoon

d: Advance of south-west monsoons over India   
he needs of humans, plants and animals, festival dates etc., all depend on monsoon in India. In this way monsoon is a unifying bond for Indians.