Solutions-Class-7-Geography-Chapter-8-How Seasons Occur-Part 2-Maharashtra Board

(b) It appears that the sun moves to the north or south in a year.

(c) Different parallels on the earth would have experienced the same climate throughout the year.

(a) The sun starts its southward journey from Tropic of Cancer on 21st June and northward journey from Tropic of Capricorn on 22nd December.

(c) Summer and winter.

• The earth revolves around the sun, with an elliptical path of revolution;
• It also spins around its axis, which is inclined.

The revolution of the earth and its tilted axis lead to the occurrence of seasons.

• On 21^st March and 23^rd September, both the poles of the earth are at the same
• distance from the sun. This condition is called equinox.
• On equinox, everywhere on the earth daytime and nighttime are of equal duration (12 hours each).
• The circle of illumination divides all the parallels from the north pole to the south pole equally.

• In Equatorial region, the sunrays are perpendicular for most of the days in a
• In equatorial region, the heat received by the sun is almost same throughout the year leading to no significant change in the climatic conditions of the region.
• Therefore, the effect of the seasons is not experienced in the Equatorial region.

• Sunrays are never perpendicular on any of the parallels between the Antarctic Circle and the South Pole.
• In the period from 23^rd September to 21^st March, the region between the Antarctic Circle and the South Pole faces the sun for 24 hours or longer.

Therefore, the sun is visible for more than 24 hours during Dakshinayan in the region between the Antarctic Circle and the South Pole.

Penguins are not found at the North Pole because,

• Penguins are native to the Southern Pole.
• They have adapted to the cold waters and icy conditions of the Southern Hemisphere. 
• The North Pole has a different climate and predators like polar bears. 
• Penguins also have limited ability to migrate due to their flightlessness and so are not found at the North Pole.

Statement is true.

False.

Correct statement : We see the apparent movement of the sun, if we observe from both (northern and southern) the hemispheres.

Statement is true.

False.

Correct statement : North Canada experiences winter from September to March

False.

Correct statement : When it is summer in South Africa, Australia has summer.

False.

Correct statement : Duration of daytime is equal on the vernal and autumnal equinoxes.