Question

why does a plant die in an airtight container after a few days​

Answer 1

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Plants need carbon dioxide to make sugars, and they produce carbon dioxide during respiration, so I don't know if your plant will run out of CO2. Plants will die if they get too dry, but if the lid is airtight, then the water vapor should not be able to escape from the jar.

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Answer 2

Explanation:

Plants need carbon dioxide to make sugars, and they produce carbon dioxide during respiration, so I don't know if your plant will run out of CO2. Plants will die if they get too dry, but if the lid is airtight, then the water vapor should not be able to escape from the jar.