HORTICULTURE

Detailed explanation-1: -Radiation with shorter wavelengths (blue/UV) stimulates the production of compounds that can influence leaf coloration. For example, in the absence of blue/UV radiation, plants that have purplish leaves outdoors may have green leaves.

Detailed explanation-2: -Green light is the least effective for plants because they are themselves green due to the pigment Chlorophyll. Different colored lights help plants achieve different goals. Blue light, for example, helps encourage vegetative leaf growth. Red light, when combined with blue, allows plants to flower.

Detailed explanation-3: -Red and blue light is believed to have a higher quantum yield of CO2 assimilation. The blue and red parts of the spectrum are effective to satisfy the energy requirement of plants. Hence plants absorb these two colors more than any other color.