Option 1: If the earth had not been inclined on its own axis, all the seasons would have been of the same duration. This means that every season, such as spring, summer, autumn, and winter, would last for an equal amount of time. However, this option is incorrect as it contradicts the concept of changing seasons.

Option 2: The correct answer is that the seasons would not have changed. The inclination of the earth`s axis is what causes the changing seasons. When the axis is inclined towards the sun, it is summer in that hemisphere, and when it is inclined away from the sun, it is winter. If the earth`s axis was not inclined, the amount of sunlight received would be uniform across the globe, resulting in a lack of seasonal variations.

Option 3: If the earth had no inclination, summers would not necessarily be of longer duration. The duration of summers is influenced by factors such as the tilt of the earth`s axis, the distance from the sun, and other climatic conditions.

Option 4: Similarly, if the earth had no inclination, winters would not necessarily be of longer duration. The duration of winters is also influenced by various factors, such as the tilt of the earth`s axis, distance from the sun,