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51.

Distinguish between the following:Easterlies and Westerlies.

Answer»
EasterliesWesterlies
(i) Easterlies blow from mid latitudinal high pressure belt to equatorial low pressure belt in both the hemispheres(i) Westerlies blow from mid latitudinal high pressure belt to subpolar low pressure belt in both the hemispheres
(ii) In the northern hemisphere, they blow from the northeast to the southwest.(ii) In the northern hemisphere, they blow from the southwest to the northeast.
(iii) In the southern hemisphere, they blow from the southeast to the northwest.(iii) In the southern hemisphere, they blow from northwest to the southeast.
52.

Can a bottle filled with water be moved to the other end of the table in this manner? Can we use the same method that you tried for moving paper rolls?

Answer»

A bottle filled with water cannot be moved to the other end of the table in this manner. We cannot use the same methods that we tried for moving paper rolls to move a bottle filled with water as it is heavier in weight, (we can if we tilt the table which was an option.)

53.

Observe the picture given below and answer the following questions:i. Which are the winds in the northern hemisphere that blow from the mid latitudinal high pressure belt to the equatorial low pressure belt?ii. What is the direction of the Westerlies in the southern hemisphere?iii. Which planetary winds blow from the mid-latitudinal high pressure belts to the subpolar low pressure belts in the northern hemisphere?iv. Why is the direction of polar winds not the same in both the hemispheres?v. Name the winds that blow in the southern hemisphere.vi. In which direction do the Easterlies blow in the Northern and Southern hemisphere?

Answer»

i. Easterlies blow from mid latitudinal high pressure belt to equatorial low pressure belt in the northern hemisphere

ii. Westerlies blow from north west to south east in the southern hemisphere

iii. The Westerlies blow from mid latitudinal high pressure belts to subpolar low pressure belts in the northern hemisphere

iv. The rotation of the earth causes the change in the direction of winds in both the hemisphere. So polar winds blow from northeast to south west in the northern hemisphere & from south east to northwest in the southern hemisphere.

v. Easterlies, Westerlies and Polar Winds blow in the southern hemisphere.

vi. Easterlies blow from northeast to southeast in northern hemisphere & from southeast to northwest in the southern hemisphere.

54.

Identify the type of winds from the description given below:i. These winds from the south-west bring rains to Indian subcontinent. During June to September, India gets rains. After this period these winds retreat.ii. These winds blowing from the north pole region towards 60°N parallel cause cold wave conditions in extensive areas covering North America, Europe and Russia.iii. Hilltops 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 become cooler and also experiences high pressure. Air in that area blows towards low pressure.

Answer»

i. South West Monsoon Winds.

ii. Polar Winds.

iii. Valley Winds.

55.

How monsoon around formed?

Answer»

In summer, near the equator the land warms up faster and most of the time the temperature of die land is higher than that of water in the oceans. The air over the land gets heated and rises. This causes the winds to flow from the t oceans towards the land are the monsoon winds.

56.

Fill in the blanks choosing the correct option from the bracket:i. Winds that blow for a short duration of time, over a limited area are called ______. wind. (polar, local, easterlies)ii. Mountain winds blow during ______ .(morning, night, midday)iii. Winds that blow at night in coastal areas are called ________ breeze, (sea, land, valley)iv. Cyclones occurring in the western part of the Pacific ocean are called ______.(hurricane, typhoons)v. Hot winds blowing in the Thar Desert are called the _______ (simoons, loo, chinook)

Answer»

i. local.

ii. night.

iii. land.

iv. typhoons.

v. loo.

57.

Fill in the blanks choosing the correct option from the bracket:i. Air moves from high pressure to low pressure areas in a ______ manner. (vertical, horizontal, parallel)ii. Winds velocity is measured in the units of ________. (knots, metres, seconds)iii. Wind which cover a large portion of the earth are called _____ wind. (local, polar, planetary)iv. Winds blowing between mid latitudinal high pressure belt and the equator are called ______. (westerlies, easterlies, polar)v. Winds blowing between mid latitudinal high pressure belt and the sub polar low pressure belt are called _______. (easterlies, westerlies, polar)

Answer»

i. horizontal.

ii. knots.

iii. planetary.

iv. easterlies.

v. westerlies.

58.

State one reason why:The Indian subcontinent experiences monsoon and retreating monsoon seasons.

Answer»

(a) Monsoon winds are generated due to uneven heating of land & water in different seasons. During summers, monsoon winds blow from sea to land & in winter they blow from land to the sea.

(b) The influence of monsoon winds is seen in summer season in the Indian subcontinent due to high temperature & low pressure in Thar desert region & Punjab plains.

(c) As these winds blow from sea to land the Indian subcontinent experiences monsoon (rainy) season.

(d) During winters, due to high pressure & low temperature in the Indian subcontinent & comparatively low pressure & high temperature in the Indian ocean winds blow from land to sea.

(e) This is the retreating monsoon season in the Indian subcontinent.

Thus the Indian subcontinent experiences monsoon & retreating monsoon season.

59.

Write in detail about cyclonic storms.

Answer»

(i) Cyclones occurring in the western part of the Pacific ocean along the coasts of Japan, China, Philippines, etc. are known as ‘Typhoons’.

(ii) These storms arise in the months between June & October.

(iii) Due to high velocity winds & heavy rains, these prove to be destructive.

(iv) The cyclones in the Caribbean Sea are known as ‘hurricanes’. These are also destructive in nature.

(v) During these storms, the minimum velocity of the wind is 60 km per hour.

(vi) Cyclones also originate in the temperate zone but they are not so powerful & hence are not destructive.

60.

Why is the air pressure high in polar areas in both the hemispheres?

Answer»
  • In both the polar areas the temperature here is below 0°C.
  • Hence the air is cold & heavy.
  • Hence the air pressure is high in the polar areas in both the hemispheres.
61.

Give detailed information about the types of planetary winds.

Answer»

The following are the types of Planetary winds:

(i) Easterlies:

  • In both the hemispheres, the winds that blow from the high pressure area between 25° & 35° parallels, to the equatorial low pressure belt (between 5°N & 5°S parallel) are called Easterlies.
  • In the northern hemisphere they blow from northeast to southwest whereas in the southern hemisphere they blow from southeast to the northwest

(ii) Westerlies:

  • In both the hemispheres, winds that blow from the mid-latitudinal high pressure belt to sub polar low pressure belt situated near 60° parallel are called westerlies.
  • In the northern hemisphere, these winds blow from the southwest to the northeast & in the southern hemisphere, they blow from the northwest to the southeast.

(iii) Polar winds:

  • In both the hemispheres, winds blowing from the polar high pressure belt to the sub polar low pressure belt (55° to 65°) are called polar winds.
  • Generally they blow from east to west.
62.

State one reason why:Planetary winds change their original direction.

Answer»

The rotation from the west to east causes the change in the original direction of the planetary winds.