Plants release oxygen during the day but not during the night, and when it is day the sun is out. Given these facts, when do plants release oxygen among the following options:
- When the sun is out
 - heat produced
 - in the autumn season
 - flow of electrons
 - When there is a full moon
 - During nighttime hours
 - When the stars are out
 - metabolic reaction


 

 When the sun is out        