Given what we know, we can confirm that the most likely reason for a scientist to conclude outright that a plant does not do photosynthesis would be that the scientist noticed an absence of chloroplasts in the plant cells.
Therefore, given that chloroplasts are the organelle of a plant cell in charge of photosynthesis, and that it is not possible to undergo this process without the presence of chloroplasts, we can confirm that their absence is the most likely reason that the scientist will conclude that the plant does not do photosynthesis.
To learn more about photosynthesis visit:
https://brainly.com/question/1388366?referrer=searchResults