In the scenario of sealing a house plant in a transparent glass container, the most likely factor that would lead to the plant's death is a lack of carbon dioxide.
Explanation: While the plant can perform photosynthesis using light, it requires carbon dioxide to produce sugars. In a sealed environment, the initial supply of carbon dioxide would eventually be depleted, and the plant would be unable to continue photosynthesizing effectively, leading to its death.
While light is available (since the container is transparent), without carbon dioxide, the plant cannot sustain itself.