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Autotrophs can use carbon dioxide (CO 2) and water to form oxygen and complex organic compounds, mainly through the process of photosynthesis. All organisms can use such compounds to again form CO 2 and water through cellular respiration .
I-photosynthesis; Metadata. This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.
Alarm photosynthesis represents a photosynthetic variant to be added to the well-known C4 and CAM pathways. However, alarm photosynthesis, in contrast to these pathways, operates as a biochemical pump that collects carbon from the organ interior (or from the soil) and not from the atmosphere. [35] [36]
Functionally, in addition to carrying out photosynthesis, the leaf is the principal site of transpiration, providing the energy required to draw the transpiration stream up from the roots, and guttation. Many conifers have thin needle-like or scale-like leaves that can be advantageous in cold climates with frequent snow and frost. [10]
Drawing of Azolla filiculoides, about 5 mm. Upper green leaves perform photosynthesis, lower lack chlorophyll. At least six extinct species are known from the fossil record: Azolla intertrappea Sahni & H.S. Rao, 1934 (Eocene, India) [11] Azolla berryi Brown, 1934 (Eocene, Green River Formation, Wyoming) [11]
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The first step in energetics is photosynthesis, where in water and carbon dioxide from the air are taken in with energy from the sun, and are converted into oxygen and glucose. [7] Cellular respiration is the reverse reaction, wherein oxygen and sugar are taken in and release energy as they are converted back into carbon dioxide and water.