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photosynthesis
vocab
Question | Answer |
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Carbon dioxide | a colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis. |
Oxygen | Oxygen forms about 20 percent of the earth's atmosphere, and is the most abundant element in the earth's crust, mainly in the form of oxides, silicates, and carbonates. |
Glucose | a simple sugar that is an important energy source in living organisms and is a component of many carbohydrates. |
Photosynthesis | the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct. |
Autotrophs | an organism that is able to form nutritional organic substances from simple inorganic substances such as carbon dioxide. |
Chloroplast | (in green plant cells) a plastic that contains chlorophyll and in which photosynthesis takes place. |
Chlorophyll | a green pigment, present in all green plants and in cyanobacteria, responsible for the absorption of light to provide energy for photosynthesis. Its molecule contains a magnesium atom held in a porphyrin ring. |
Stoma | a small mouthlike opening in some lower animals. |
Guard cells | Guard cells are cells surrounding each stoma. They help to regulate the rate of transpiration by opening and closing the stomata. |