Photosynthesizing leaves are the source of sugar which is actively transported to the seive tube
within the phloem.
Carbon dioxide (CO2) is used by photosynthetic organisms as their primary source of carbon, and this molecule is reduced during photosynthetic reactions. Actually, adding carbon dioxide to microalgae is recognized as a suitable method for increasing microalgal production.
The glucose is prepared by the source by photosynthesis , it is converted to sucrose . The sugar is then moved in form of sucrose into the companion cells and then into living phloem, seive tube cells by active transport.
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