Answer:
The assumption that incorporation of carbon dioxide into plants during photosynthesis violates the second law of thermodynamics is wrong because the total system including the photosynthetic plants and the sun become less ordered by time.
Explanation:
According to second law of thermodynamics the total entropy of a system can never decrease with time.
The degree of randomness in a system is called entropy and the entropy of the universe always increases. Thus if we can consider plants and sun to be a part of the system universe where entropy is always on the increase.