Across
- 5. an organism that is able to form nutritional organic substances from simple inorganic substances such as carbon dioxide.
- 8. a colorless, odorless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air.
- 9. A substance present in all living cells that provides energy for many metabolic processes and is involved in making RNA.
- 10. (in green plant cells) a plastid that contains chlorophyll and in which photosynthesis takes place.
- 11. an internal system of interconnected membranes, that carry out the light reactions of photosynthesis.
- 12. A chemical process that occurs in plants, algae, and some types of bacteria, when they are exposed to sunlight.
Down
- 1. an organism deriving its nutritional requirements from complex organic substances.
- 2. the supportive tissue of an epithelial organ, tumor, gonad, etc., consisting of connective tissues and blood vessels.
- 3. the cycle of chemical reactions where the carbon from the carbon cycle is fixed into sugars.
- 4. 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.
- 6. the reaction which occurs as the first phase of photosynthesis, in which energy in the form of light is absorbed and converted to chemical energy in the form of ATP.
- 7. the main type of sugar in the blood and is the major source of energy for the body's cells.