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Q117 (CDS-I/2002) Geography › World Physical Geography › Earth rotation and time Answer Verified

Which one of the following would have occurred if the earth had not been inclined on its own axis?

Result
Your answer: —  Â·  Correct: B
Explanation

The Earth's axial tilt, currently approximately 23.4 to 23.5 degrees, is the primary cause of seasonal variations [3]. As the Earth revolves around the Sun, this tilt ensures that different hemispheres receive varying amounts of direct sunlight at different points in the orbit [t3]. If the Earth were not inclined on its axis (zero obliquity), the equator would always face the Sun directly, and every location would receive a nearly identical amount of solar energy year-round [t5]. Consequently, the distinct cycle of spring, summer, autumn, and winter would cease to exist because the angle of the Sun's rays at any given latitude would remain constant throughout the year [t7]. While day and night would still occur due to rotation, the seasonal changes in temperature and day length would disappear [c3][t5].

Sources

  1. [1] Science-Class VII . NCERT(Revised ed 2025) > Chapter 12: Earth, Moon, and the Sun > 12.2.2 Seasons on the Earth > p. 177
  2. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 19: The Motions of The Earth and Their Effects > Lunar Nodal Cycle > p. 266
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