You need one atom of carbon and two atoms of oxygen
Carbon dioxide
Plants need carbon dioxide for photosynthesis. Carbon dioxide is a gas
Carbon Dioxide is needed for plants to make food.
oxygen
Producers get the carbon dioxide that they need to make food from the consumers. Consumers and producers swap the gasses that they need to survive.
What Plants Need to Make FoodPlants make food from carbon dioxide and water during photosynthesis.
Carbon dioxide is present in the air because plants need carbon dioxide to make food and without carbon dioxide plants would die and eventually the rest of the food chain.
The atmosphere didn't literally need the Carbon Dioxide! The main purpose of the Carbon Dioxide is for the plants! Plants needed Carbon Dioxide for their process called photosynthesis to produce their own food and in return they exchange it into Oxygen but for me personally the Carbon Dioxide in our atmosphere is also there to maintain the balance in it.
Respiration - make carbon in carbon dioxide
No, they don't need moonlight to make their food they only make their food when there is sunlight. In night they take in carbon dioxide (CO2) and breath out carbon dioxide (CO2) only.
Roots do not make carbon dioxide.
Carbon dioxide.