Maharashtra Board Class 7 Geography Solution Chapter 5 – Winds
Balbharati Maharashtra Board Class 7 Geography Solution Chapter 5: Winds. Marathi or English Medium Students of Class 7 get here Winds full Exercise Solution.
Std | Maharashtra Class 7 |
Subject | Geography Solution |
Chapter | Winds |
(Q1) Rewrite the following statements after choosing the correct option.
(1) When the air expands, it ____________
Ans: – becomes thinner
(2) From high air pressure regions, winds _______________________________
Ans: – Blow towards regions of low air pressure.
(3) Win the northern hemisphere, winds blowing towards the equator __________________ due to the rotation of the earth.
Ans: – turn to the east.
(4) The direction of seasonal winds blowing over the guardian subcontinent during winter is from the ____________________
Ans: – north-east to south-east.
(5) The growing forties in the southern hemisphere ________________________________
Ans: – blow in the areas around 40os parallel
(Q2) Identify the type of winds from the description given below.
(1) These winds from the south-west bring rains to the Indian subcontinent. During June to September, India gets rains after the period these winds retreat.
Ans: – Seasonal winds (Monsoon)
(2) These winds blowing from the north pole region towards 60oN parallel cause cold wave conditions in extensive area covering north America, Europe and Russia.
Ans: – Polar wind or polar Easterlies.
(3) Hill tops get heated quickly during the day. The air in this part becomes hot, light and starts ascending. Hence, a low pressure area forms in this region. At the same time the air at the foothills being cooler and that area blows towards low pressure.
Ans: – Mountain breeze is the type of winds identified from the above description.
(Q3) Given below are the values of air pressure in millibars using the same, draw diagrams to show a cyclone and an anticyclone ·990, 994, 996, 1000
Ans: –
(Q4) State one reasons why.
(1) A belt of calm exists near the equator
Ans: – The sunrays can be perpendicular near the equator. So the temperature is higher in this region. Hence air near the equator gets heated expands, becomes lighter and moves towards the sky. As this process operates continuously a belt of calm exists near the equator.
(2) The winds coming from the north-west in the southern hemisphere have greater velocities than the winds coming from the south-west in the northern hemisphere.
Ans: – The southern hemisphere is mostly occupied by oceans. In this hemisphere the obstacle caused by the relief of the land surface is almost absent. As there is no obstacle, the winds coming from the north-west is southern hemisphere have greater velocities than the winds coming from the south-west in the northern hemisphere.
(3) The monsoon winds in the summer come from the sea but the retreating monsoon winds in winter come from land.
Ans: – Due to the uneven heating of land and sea water in the different seasons, the monsoon winds in the summer come from the sea but the retreating monsoon winds in winter come from land.
(Q5) Complete the flow chart
Ans: –
(Q6) Answer in short
(1) Why is the air pressure high in polar areas in both the hemispheres?
Ans: – In both the Polar Regions, the temperature is below 0o c throughout the year. Hence here the air is cold. As a result, the air hemispheres.
(2) What effect does the rotation of the earth have on the winds?
Ans: – The direction of the winds is influenced by the rotation of the earth.
(3) Why do the cyclonic winds blow in a circular manner?
Ans: – Due to the rotation of the earth the cyclonic blow in a circular manner.
(4) State the reasons that lead to the formation of cyclones and describe the effect of cyclones.
Ans: –
Cyclonic conditions are created when a low pressure area is surrounded by high pressure areas.
During the cyclonic condition, wind starts blowing towards the low pressure area from the surrounding high pressure area. The cyclonic winds in the northern hemisphere move in an anticlockwise direction, whereas they move in a clockwise direction in the southern hemisphere. During a cyclone the sky is cloudy, winds blow with a very high velocity and it rains heavily. The area affected by cyclones is limited.
Extra Questions and Answers Notes
1.) The movement of air is called ______________ .
A:- Wind
2.) Which direction does the wind moves ?
A:- Air usually moves from high pressure area to low pressure area.
3.) The unit of measurement of wind speed is _____________________ .
A:- knots or kilometres per hour.
4.) What is planetary wind ?
A:- Some wind flows high pressure to low pressure throughout the year and covers a large part of the earth, it is known as planetary wind. As such polar wind, the Easterlies, the Westerlies
5.) What is easterlies ?
A:- The air that flows from the high pressure zone of 25 – 35 latitudes in both hemispheres towards the equatorial low pressure zone is called easterlies. This wind blows from northeast to southwest in the northern hemisphere and from south east to northwest in the southern hemisphere.
6.) what is Westerlies ?
A:- In both hemispheres the wind that blows from the latitude high pressure zone to the sub polar low pressure zone throughout the year is called westerlies. In the southern hemisphere this wind blows from northwest to south east and in the northern hemisphere from south west to north east.
7.) what is polar wind ?
A:- The air that flows from the polar high pressure zone to the sub polar low pressure zone in both hemispheres is called polar air. Usually it flows from east to west.
8.) In which hemisphere does air flow at high speed and why ?
A:- In the southern hemisphere the wind blows high speed because – the southern hemisphere is dominated by the sea. In this hemisphere, there is no barrier between air and land. As there is no barrier to friction with the land air flows faster in this hemisphere than in the northern hemisphere.
9.) ___________________ latitude is called roaring forty.
A:- 40° S
10.) _________________latitude is called Furious Fifties.
A:- 50° S
11.) _________ latitude is called Screeching Sixties.
A:- 60° S
12.) What is doldrums ?
A:- The region between the 5 degree north to 5 degree south latitude does not have wind blowing most of the year, so the region remains calm and is called doldrums.
13.) In both hemispheres the high pressure zone between the 25 to 35 axis is known as _________________ .
A:- Horse latitudes
14.) Winds blowing from the sea towards the land are called _____________________ .
A:- Sea breezes
15.) Match the following :
Name of the wind | In all those regions the air is flowing |
Loo | blow in Spain, France and areas the around the Mediterranean Sea. |
Simoom | blow around the Pampas grasslands in South America. |
Chinook | blow from the Alps Mountains towards the coastal areas of Italy. |
Mistral | blow inthe Sahara and Arabian deserts. |
Bora | blow along the northern slopes of the Alps |
Pampero | Blows in the North Indian plains during the summer season |
Fohn | blow down the eastern slopes of Rocky Mountains of North America |
16.) What is monsoon ?
A:- The air that is created to vary the temperature of the water body and the land surface , and flows in opposite directions from season to season is called seasonal climate.
17.) Most of the rainfall in india is caused by ________________ winds.
A:- Monsoon winds
18.) When is a cyclone formed ?
A:- Cyclones occur when air flows from high pressure to low pressure when a large range of low pressure areas from between the high pressure areas.
19.) The cyclones in the Caribbean Sea are known as ______________ .
A:- hurricanes
20.) When is a anticyclone formed ?
A:- Cyclones occur when air flows from high pressure to low pressure when a large range of high pressure areas from between the low pressure areas.
21.) What is the difference between cyclone and anti-cyclone ?
Cyclone | Anti cyclone |
The center of the cyclone is the low pressure | The center of the anti cyclone is the high pressure |
Wind speeds range from moderate to intense | The wind speed is slow |
There is a lot of rainfall in the cyclone | There is no precipitation of the anti cyclone |
The wind of the cyclone is blowing towards the center from all sides | The wind of the anti cyclone blows in all directions from the center |
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