The by-product in plant photosynthesis is? by Sunday | Jun 8 | Agricultural Science WAEC | 0 comments A. carbondioxide B. carbohydrate C. hydrogen D. oxygen Correct Answer: Option D – oxygen Users Also Read These:If the cross of a red-flowered plant with a…Which of the following is considered to be the first…When the Total Product (TP) is at maximum point, the…The first stable product of photosynthesis is?A pupil accidentally "watered" a potted plant with…