Just like us and other living creatures on the earth, plants also need air to survive. While we, the human beings, need air only to breathe in, the plants need it for making their food as well. During the day and night time, plants inhale oxygen for survival. They absorb oxygen through pores found on undersides of the leaves. The oxygen spreads into the live cells of plants and makes them breathe. Carbon dioxide also seeps out through these pores.
