Which one of the following colors is the LEAST useful for plant life?

Red

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Blue

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Green

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Violet

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Solution

The correct option is C Green
The green light is the least useful for plants because they reflect green light. Green plants are green because they contain chlorophyll pigment which reflects green light. Different color light helps plants achieve different phenomenon. Blue light, for example, helps encourage vegetative leaf growth. Red light, when combined with blue, allows plants to flower.
So, the correct answer is 'Green'.

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