On a flat disc facing the Sun, solar radiation would strike all points perpendicularly with uniform intensity, eliminating latitudinal temperature gradients, distinct polar belts, planetary wind systems and seasonal variations.
CBSE Class 9 Science Chapter 13 Earth as a System: Energy, Matter and Life Solutions
NCERT Class 9 Science Exploration Chapter 13 Question Answer
If the Earth were a flat disc oriented toward the Sun, solar rays would strike the entire surface at identical perpendicular angles, delivering uniform insolation everywhere. Consequently, the sharp temperature gradients between the equator and poles would disappear. The absence of differential heating would eliminate global planetary pressure belts, standard wind circulation cells and traditional planetary climatic zones.
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