If only light and dark forms of blue are used in a picture, what will the scheme be?

Monochromatic scheme

Direct answer: A, a monochromatic scheme. “Mono” means one, and a monochromatic colour scheme is built from one hue together with its lighter and darker values. Here the hue family is blue; light blue, middle blue and dark blue may all be used, but the basic colour remains blue. B is wrong because a complementary scheme uses colours opposite each other on the colour wheel, such as blue and orange. C is wrong because an analogous scheme uses neighbouring hues, such as blue, blue-green and green, rather than only one hue. D is wrong because a triadic scheme uses three colours spaced around the colour wheel. Changing the value of blue does not create new hue families; it creates variations within the same colour. Memory cue: one hue plus its tints and shades equals monochromatic.

This is a Class 10 Art Education question. Chapter: Fundamentals of Visual Arts. Topic: Colour.