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Both plants and animals need to take in oxygen for their cells to respire. Respiration in plants and animals is where their cells break down simple molecules like glucose (C6H12O6) and use the energy from this process for other things - like assembling other molecules (e.g. proteins) or moving molecules around (active transport).

The simple equation for respiration is C6H12O6 + 3O2 → 6H2O + 6CO2. This shows that plant and animals take in oxygen and expel carbon dioxide.

But (green) plants photosynthesise as well. This allows them to store energy from light in the chemical bonds in sugars. This energy is released when the sugar is broken down ('catabolised') as part of respiration. The simple equation for photosynthesis is 6H2O + 6CO2 → C6H12O6 + 3O2. When photosynthesising (i.e. during the day, when they can use the daylight), plants also release oxygen.

Also, in the air we expel from our lungs isn't completely empty of oxygen either - although there is a little less oxygen and a little more carbon dioxide in it than when we breathed in. This is why mouth-to-mouth resuscitation works - there is still a lot of oxygen in the air we breathe out.

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Related Questions

What do plants expel?

oxygen


Importance of oxygen to plants?

Plants expel oxygen as a byproduct of photosynthesis. This process takes carbon dioxide and breaks it into carbon and oxygen.


Is it true that sleeping with plants in your room will cut off your oxygen supply?

No, the exact opposite is true. Plants expel oxygen, so sleeping in a room with plants is healthier for you.


Do plants expel oxygen- excludes trees?

Yes, plants release oxygen during the process of photosynthesis. This occurs as a byproduct when plants convert carbon dioxide and sunlight into glucose and oxygen. This oxygen is then released into the atmosphere as a waste product.


How is oxygen replaced?

Oxygen is replaced through the process of photosynthesis, where plants and other producers take in carbon dioxide and release oxygen as a byproduct. Additionally, oxygen is replenished by the dissolving of oxygen gas from the atmosphere into water bodies.


What is 1 way plants are helpful to people?

Plants undergo photosynthesis which rids the world of the carbon dioxide that animals and people expel due to cellular respiration, and convert it into oxygen. We breathe the oxygen as we need it to survive.


What is the gas exchange between humans and plants?

Plants take in Carbon Dioxide and expel Oxygen as a by-product of cellular respiration. Animals take in Oxygen and expel Carbon Dioxide as a by-product of cellular respiration.


What plants convert carbon dioxide into oxygen?

Plants, such as trees, grasses, and algae, use a process called photosynthesis to convert carbon dioxide into oxygen. During photosynthesis, plants take in carbon dioxide from the air and water from the soil, and use sunlight to produce oxygen as a byproduct. This process is essential for balancing the levels of oxygen and carbon dioxide in the atmosphere.


What role did plants play in the oxygen cycle?

plants use a prosses of photosynthesis this means that the plants take in carbon dioxide and turn it into oxygen, that is why protecting the plants and envirment is so important. without plants the eath would be full of cabon dioxide making it impossible to live


Bacteria-sized mitochondria in both plant and animal cells produce what and expel what?

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Why do plants breathe in oxygen at night?

that's not true....like all living organisms, plants breathe in oxygen at all times..its just that they involve in photosynthesis , in addition, during daytime Plants do indeed take in carbon dioxide and expel oxygen. It is the only reason we are here. Oxygen is unstable and must be constantly replenished, without the plants putting off oxygen we could not survive. It is the basic formula for life and is what we search for in the cosmos for other inhabited planets.


What do plants provide all life on earth?

Plants are a source of food and energy for herbivores. Plants are producers, meaning they make their own food from solar energy. They are the base of any food chain. Many animals, such as monkeys, birds, or insects, also live on or in plants. Finally, plants provide oxygen for humans and animals to breath. Before plants and other photosynthesizing organisms, the earth had no oxygen. Plants use the carbon dioxide that animals expel in photosynthesis, and release oxygen, which is a waste product for plants but vital for animals.