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Which element most helps to show the three-dimensional effect of a sphere?

Answer and explanation

Correct answer: Gradual value transition from light to dark

The governing concept is tonal modelling: a sphere appears three-dimensional when its surface moves gradually from a light area through middle values into a darker shadow area according to the light source. Therefore, option B is correct. A uniform dark outline can show the boundary but cannot describe rounded volume; evenly distributed dots and flat white fill do not show the changing planes of the form. A controlled value transition creates the visual impression of curvature.

Related tags

Sphere ShadingTonal ValueThree Dimensional FormLight And ShadowPencil ShadingDrawing BasicsArt EducationClass 9 Mcq

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