What is the main purpose of using lines in two directions in cross-hatching?

To make shade and depth more effective

Cross-hatching is a drawing technique used to create tone with groups of lines. First, lines are drawn in one direction; then another group is drawn across them in a different direction. When the lines are close together or several layers cross, the area appears darker. When they are farther apart, it appears lighter. This variation helps suggest shadow, form, and depth.

Thus option A, making shade and depth more effective, is correct. The crossing of lines does not make the picture blank or invisible, and it is not mainly intended to show a fold in the paper. An artist can change the spacing, direction, and number of layers to make a surface look rounded or recessed. The method is especially useful when a gradual tonal effect is needed without filling the area with solid colour.

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