Nave, R. (2009, March 24). Plant energy transport. Retrieved March 25, 2009, from Hyperphysics, Biology: http://hyperphysics.phy-astr.gsu.edu/Hbase/Biology/plaene.html
Nave describes the plants as autotrophs because they are able to transport their energy by converting carbon dioxide into oxygen. It's nutrients are also formed when the
combination of carbon dioxide, water, and sunlight convert the nutrients into sugar, which is also known as glucose. Since the nutrients are always processed in the leaves, the nutrients must go to the other parts of the plant. In addition, the glucose and all the other organic molecules are transported along the plant through a special layer of plant tissue known as phloem. Phloem, if you don't already know, is composed of living cells that transport a water solution of sugars that we commonly call sap. The movement throughout the plant is classified by the pressure-flow theory, which is where the sugar-containing fluid is moved through sieve tubes by fluid pressure. This means that nutrients are moved from the photosynthetic site, also known as the source, to the place where the sugar is being used, which is classified as the sink, whether it moves up or down the stem of the plant. Though the author is a scientist, and I would not question what he is saying, it is extremely difficult for the common reader to understand. However, I appreciate how he explains the plant's process of photosynthesis very much because it is all true.
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