What weakness occurs if shading on a cylinder’s long surface is like a straight strip without curve?

The sense of roundness will weaken

The governing concept is shading according to surface curvature. A cylinder has a continuously curved side, so its light and dark values should change gradually across that curved surface. A straight, rigid strip of shading ignores the turning of the surface and makes the value pattern look pasted on rather than wrapped around the cylinder. As a result, the sense of roundness and volume becomes weak, making option A correct. Option B is the opposite of the visual result. Option C concerns the construction of an ellipse at the ends and cannot be corrected by a flat strip of side shading. Option D is also false because perspective does not repair inconsistent value. The shading should follow the cylinder’s curvature while remaining consistent with the light source.

This is a Class 9 Art Education question. Chapter: Elements of Art. Topic: Form.