Question

Three of the same species of plant are each grown under a different colored light for the same amount of time. Plant A is grown under blue light, Plant B is grown under green light, and Plant C is grown under orange light. Assuming the plants use only chlorophyll a and chlorophyll b for photosynthesis, what would be the predicted order of the plants from most growth to least growth?
a. A,C,B
b. A,B,C
c. C,A,B
d. B,A,C

Short answer

Photosynthesis does not occur in the presence of green light. In blue light, photosynthesis is at its peak. As a result, option (a) A, C, B is the correct response.

Step-by-step solution

step-1: Introduction

In this situation, maximum photosynthesis occurs in blue light$(450nm)$ because chlorophyll a and chlorophyll b receive the most excitation, whereas green light is not absorbed at all, therefore no photosynthesis occurs in this light.

step-2: Explanation of the correct answer

A, C, and B option (a). In green light, no photosynthesis occurs, and only a small quantity of orange light is absorbed by chlorophyll a and chlorophyll b, whereas maximum photosynthesis occurs in blue light. As a result, option is the proper response (a).

step-3: Explanation of incorrect answers

A, B, and C option (b). Because no photosynthesis happens in the presence of green light, B cannot be ranked second. As a result, this is a bad choice.

C, A, and B option (c). Because maximum photosynthesis occurs in blue light, C orange light cannot be ranked first. As a result, this is a bad choice.

B, A, and C option (d). B cannot be first since no photosynthesis happens in green light. As a result, this is a bad choice.