Yes, flowers can take oxygen from a room at night. During the day, plants undergo a process called photosynthesis, where they use sunlight to convert carbon dioxide into oxygen. This process leads to an increase in oxygen levels in the room. However, at night, photosynthesis stops, and plants begin to respire like humans, absorbing oxygen and releasing carbon dioxide. This can lower the oxygen levels in the room if there are many plants present.
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It is important to note that not all plants behave in the same way during the nighttime. While most plants respire and absorb oxygen, there are a few exceptions like orchids, succulents, and epiphytic bromeliads. These plants continue to release oxygen during the night and can help replenish the oxygen levels in the room.
Overall, if there are many flowers or plants in an enclosed space, it is possible that the oxygen levels may decrease at night. However, it should be noted that the decrease in oxygen is typically not significant enough to cause any health issues for humans, especially in well-ventilated rooms.