This is most likely because the tobacco seeds required light in order to germinate, and the opaque cover prevented the seeds in Dish A from receiving any light.
The dishes were placed equidistant from a light source set to a cycle of 14 hours of light and 10 hours of dark. All other conditions were the same for both dishes. The dishes were examined after 7 days, and by the time the cover was removed on day 7, the seeds in Dish A were already too far behind in their development, as the seeds in Dish B had been receiving light for 7 days and had already begun to germinate.
By day 14, the seeds in Dish A had not had enough time to catch up to the seeds in Dish B, and so none of the yellow-leaved seedlings survived in either dish.
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