Jan. 19th- Test 1 - I II Water Movement from Soil to Leaf A...

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January 19, 2011 I. Water Movement from Soil to Leaf A. Water is mostly lost from the leaf and not from the other parts of plants. II. Leaf Anatomy A. Epidermis A.1. How do gases get into and out of the leaf? Holes known as stomata, whose main function is to expose mesophyll cells to as much CO 2 as possible, and are opened and closed by guard cells A.2. B. Mesophyll B.1. composes most of the leaf interior B.2. Parenchyma cells that are photosynthetic C. Vascular Tissues C.1. Xylem- tends to be an inorganic solution but not always; always on the top in the vascular bundle C.1.i. Helps to support plant and its leaves C.1.ii. Conducts water absorbed by the roots to the leaves C.1.iii. Wood is Xylem C.2. Phloem- C.2.i. Conducts the solution containing organic molecules (Carbohydrates, amino acids, etc.) from the leaves C.3. Xylem and Phloem are always found together, and there is some water exchange between the two. There are some vascular bundle strands known as veins in the leaf that contain xylem and phloem, on top and on the bottom, respectively.
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