7. Describe how water moves up the stem of a plant from the roots to the leaves.

Question

7. Describe how water moves up the stem of a plant from the roots to the leaves. 8. On St. Patric's Day in many places, florists offer carmations that hav w, petals have not been "dipped" into a green dye carnations are naturally produce these carmie or paint.Use your understanding of water movement in planis als. These aa e green speckled pet Use your 9. Name at least two environmental factors that are likely to cause a high rate of transpiration in plants and explain why they do. 10. Imagine two plants in approximately the same climate conditions. One grows in open meadows and is exposed to full sunlight and brisk winds, while the other grows on the forest floor, beneath the shade of large trees and sheltered from the wind. Which would likely have a greater density of stomata and why?

Explanation / Answer

water has entered a root hair, it must move across the cortex and endodermis before it reaches the xylem. Water will take the path of least resistance through a root to reach the xylem.

Answer 7

Water can move across the root via three different pathways. One path is the apoplastic path where the water molecule stays between cells in the cell wall region, never crossing membranes or entering a cell. The other two routes, called cellular pathways, require the water molecule to actually move across a membrane. The first cellular pathway is the transmembrane path where water moves from cell to cell across membranes; it will leave one cell by traversing its membrane and will re-enter another cell by crossing its membrane. The second cellular path is the symplastic path which takes the water molecule from cell to cell using the intercellular connections called the plasmodesmata which are membrane connections between adjacent cells. Regardless of the pathway, once the water molecule has traversed the cortex, it must now cross the endodermis. The endodermis is a layer of cells with a waxy inlay or mortar called the Casparian strip that stops water movement between cells. At this point, water is forced to move through the membranes of endodermal cells, creating a sieving effect. Once in the endodermal cells, the water freely enters the xylem cells where it joins the fast moving column of water or transpiration stream, headed to the leaves.

Related Questions

Navigate

• Browse (All)
• Browse 7
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.