Two green plants are kept separately in oxygen-free containers,one in the dark and the other in continuous light. Which one will live longer? Give reasons.

(B) The plant kept in continuous light will live longer.
This is because,in the presence of light,the plant performs photosynthesis,which produces $O_2$ as a byproduct.
This $O_2$ is then utilized by the plant for its cellular respiration,allowing it to survive.
In contrast,the plant kept in the dark cannot perform photosynthesis and will quickly consume the limited oxygen available in the container,leading to its death.