The production of auxin in response to light involves A) zeaxanthin. B) phytochrome P_r. C) a mechanism that is currently unknown. D) phototropin. E) Both a and b

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The production of auxin in response to light involves phototropin. Phototropin is a blue light receptor found in plants. When activated by blue light, phototropin triggers the production and transport of auxin, leading to plant growth towards the light source (phototropism). Zeaxanthin and phytochrome P_r are not directly involved in the production of auxin in response to light, and the exact mechanism is not fully understood, but it does involve phototropin.

The Production of Auxin in Response to Light Involves