A spaceship designed to support human life for a multiyear voyage to the outer planets of the solar system will include plants to provide oxygen and consume carbon dioxide.Because the spaceship will have limited exposure to the sun for extensive periods,an artificial light source will be needed to support photosynthesis.What wavelengths of light should be used to maximize plant growth with a minimum expenditure of energy?
A)full-spectrum white light
B)green light
C)a combination of blue and red light
D)yellow light
E)UV light

Question

Quizplus · Accepted Answer

Blue and red light wavelengths are most effective for photosynthesis as they are absorbed most efficiently by chlorophyll. Green and yellow light is less effective, and UV light can be damaging to both plants and humans. Using a combination of blue and red light will maximize plant growth with a minimum expenditure of energy. Full-spectrum white light would be less effective as it includes wavelengths that are not as efficiently absorbed by chlorophyll.

A Spaceship Designed to Support Human Life for a Multiyear