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UPCAT Science practice question 43: The seasons on Earth are caused primarily by

Correct answer

A. the tilt of the Earth's axis relative to its orbital plane

The roughly 23.5-degree axial tilt changes the angle and duration of sunlight through the year. Orbital distance varies too little to explain the effect, and the hemispheres have opposite seasons.

The seasons on Earth are caused primarily by

  1. the tilt of the Earth's axis relative to its orbital planeCorrect
  2. changes in the Earth's distance from the Sun
  3. variations in the Sun's energy output
  4. the rotation of the Earth on its axis

Why A is correct

The roughly 23.5-degree axial tilt changes the angle and duration of sunlight through the year. Orbital distance varies too little to explain the effect, and the hemispheres have opposite seasons.

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