How do we get oxygen from trees?

Question

How do we get oxygen from trees?

Answer 1

All green plants prepare their own food in presence of sunlight, CO2 and water with the help of the chlorophyll pigment which is green in colour. During this process which is called as photosynthesis, O2 is released and glucose is prepared. The O2 is released in the atmosphere thus making it available to other organisms which are unable to produce O2.  

Answer 2

Photosynthesis. Using the suns energy, green plants convert carbon dioxide and water into simple sugars and oxygen. Along with carbon dioxide, plants also need water, which is gathered by the plant�s roots, to make food through the process of photosynthesis. The stomata allows oxygen to be released through this process. This oxygen is an important exchange for all living things. Plants take in the carbon dioxide and give off the oxygen that we need in order to breathe.

http://wiki.answers.com/Q/How_do_trees_p...

Answer 3

Due to photosynthesis

During the day the  plants take up water CO2 and produce energy (carbohydrates)for themselves and give off oxygen as a byproduct. This process requires light as the energy source . This light is absorbed by the chlorophyll present in the plants that make the light energy available for the reaction.

Photosynthesis is a series of enzyme-catalyzed steps for the conversion of light energy into chemical energy by living organisms.

In the night the plants Take up oxygen for the cellular respiration and give off CO2