Strategies for writing an effective introduction. Start by thinking about the question (or questions) you are trying to answer. Your entire essay will be a response to this question, and your introduction is the first step toward that end.
A: Plants release oxygen as a by-product of photosynthesis, a process in which carbon dioxide is converted into sugar. The sugar is then used as an energy source for the plant. When oxygen is produced through photosynthesis, it is released by the plant into the atmosphere. The sugars produced by photosynthesis are utilized by combining them with oxygen through a process called oxidation. Photosynthesis chemically converts sunlight into energy after being collected by special cells in their leaves known as chloroplasts.
Plants breathe. They take carbon dioxide from the atmosphere and turn it into the sugars that become leaves, stems, roots, and woody trunks. What carbon dioxide they donât use, they exhale, releasing the leftover gas with oxygen. And after plants die, they decay, releasing the carbon to the atmosphere. The difference between the amount of carbon plants absorb and what they release is called net primary productivity.