It has long beer known that when exposed to light under suitable conditions of temperature and moisture, the green parts of plents use carbon dioxide from the atmosphere and release oxygen to it. These exchanges are the opposite of those that occur in respiration. The process is called photoshynthesis. In photosynthesis, carbonhydrates are synthesized from carbon dioxide and water by the chloroplasts of plant cells in the presence of light. In most plants, the water used in photosynthesis is absorbed from the soil by the roots and translocated through the stomates. Oxygen is the product of the reaction. For each molecule of carbon dioxide used, one molecule of oxygen is released.
Two years ago I moved to a new neighbourhood. There seem to be very few people in this area who are without telephones, so I expected to get a new phone quickly. I applied for one as soon as I moved into my new house. "We aren't supplying many new phones in your area," an engineer told me. "A lot of people want new phones at the moment and the company is employing fewer engineers than last year so as to save money. A new phone won't cost you mush money, but it will take a little time. We can't do anything for you before December." You nees a lot of patience if you're waiting for a new phone and you need a few friends whose phones you can use as well. Fortunately, I had both. December came and went, but there was no sign of a phone. I went to the company's local to protest. "They told me I'd have a phone by December," I protested. "Which year?" the assistant asked.