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. Along with 24/7 Вrequirement of oxygen, plants also need carbon dioxide during the day for making their food. In the presence of sunlight, the chlorophyll in leaves makes food with the help of water in the soil and carbon dioxide in the air. This process is known as photosynthesis. For photosynthesis, plants also inhale carbon dioxide through the same pores.
So, plants need air for two reasons в respiration and photosynthesis. In fact, plants are the natureвs greatest recycling agents. While all living creatures, animals and plants exhale carbon dioxide as a waste product of respiration, plants take up it during day time for making their food. During this process of making food or photosynthesis, plants convert carbon dioxide and water into oxygen. Besides, plants do not need as much oxygen as animals or human beings, because they are stationery and they have different metabolic needs. This way, the earth never runs out of oxygen because plants continuously keep converting carbon dioxide into oxygen and keep seeping carbon dioxide for photosynthesis.
Answer 1: This is a really good question and something a lot of people usually don\’t think about.
The answer is that all plant cells need oxygen to live, because without oxygen they can\’t perform aerobic respiration (respiration is the process of breaking down food to get energy). Of course you probably know that when plants perform photosynthesis, they combine water, carbon dioxide, and the sun\’s energy to produce sugar and oxygen. So the cells in the green parts of the plant, where photosynthesis is taking place, get all the oxygen they need from the oxygen produced by photosynthesis. So cells in the leaves and stems are okay. The trick is the cells down in the roots, where there is no photosynthesis. In most plants, these cells get their oxygen from air in the spaces between dirt particles in the soil (you\’d be surprised how much empty space there is in the soil — mostly because earthworms are always moving around, churning up the dirt).
But for plants that live in soggy environments, that\’s not an option, because water holds a lot less oxygen than air does (we\’re talking about O here, not the oxygen in H 0). So some wetlands plants have developed a tolerance for low-oxygen conditions, and a lot of them have really shallow root systems so they\’re as close as possible to the air. Mangroves are trees that live in saltwater lagoons, and they have evolved special roots, called pneumatophores (Greek for \’air carrier\’), that act like snorkels for the roots. But most plants don\’t have these special tolerances and adaptations, which is why you can \’drown\’ your houseplants if you water them too much.