3 ms·

Well photosynthesis stops at night but metabolic activity doesn't, so presumably they consume oxygen. No idea how much though.

• whythre 6y ago
  Plants consume CO2 and ‘exhale’ oxygen. They don’t consume it.
  • dimeatree 6y ago
    Plants do release a bit of CO2 during the night due to respiration, they need sunlight for photosynthesis to occur.