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You are conducting an experiment to examine the effect that light has on plant growth. During this experiment, you grow the same type of plant under 4 different types of light with one plant receiving no light as a control. Each plant started out as a seedling less than an inch in length. Below are the results of your experiment after 18 weeks.

No Light: 1in
White Light: 22in
Blue Light: 13in
Green Light: 2in
Red Light: 18in

Upon examination, you realize that the plant you grew under the green light is barely taller than the plant grown under no light. In 3 to 4 sentences, explain why the plant grown under green light grew less than the plants grown under white, red, or blue light.

To receive full credit for this item, your response must:
Have the minimum number of sentences. (1pt.)

Accurately explain why the plant did not grow well under the green light. Use the words reflect and absorb in your response. You will lose a point if both words are not in your answer (3pt.)
*
4 points
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The plant grown under green light grew less than the plants grown under white, red, or blue light because green light is mostly reflected by plants rather than absorbed for photosynthesis. Since plants primarily use red and blue light wavelengths for photosynthesis, the green light is not as efficiently utilized, resulting in stunted growth compared to the other light conditions.

how do you know

Plants appear green to our eyes because they reflect green light wavelengths and do not absorb them as efficiently as red and blue light for photosynthesis. This is why green light is not as effective for plant growth compared to other wavelengths of light.