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Concept explainers
To review:
The role of aquaporins in the uptake of water from the soil by root cells.
Given:
The oocytes of the frog Xenopus laevis were taken by the researchers and injected with the messenger ribonucleic acid (mRNA) of plant tonoplast intrinsic protein (TIP). They are large in size and have a low osmotic cell permeability. The, mRNA of a nontransport protein is taken in the second case and injected into the oocytes. Some of the oocytes were not injected at all and this became the third case of the experiment. These cells were observed after giving incubation of 2 days in isotonic medium and a treatment with hypotonic solution. The following graph was made by plotted changes in relative volume on the y-axis and time on x-axis:
The oocytes which had TIP mRNA burst after sometime while the oocytes, which were injected with a different nontransport protein, and the oocytes which were not injected do not burst. The following table depicts the osmotic water permeability of the three conditions as calculated by the researchers:
Introduction:
Aquaporins are the integral membrane proteins which are responsible for the transport of molecules of lower weight across the bilipid layer. They transport across the concentration gradient and does not require energy.
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Chapter 34 Solutions
EBK LIFE: THE SCIENCE OF BIOLOGY
- Water potential is a driving force in plants’ ability to transport water. Explain what water potential is, and describe a specific example of its role in water movement throughout a plant.arrow_forwardDescribe how the water potential of a leaf changes throughout the course of a 24-hour period. What is driving this change? How does the water potential of this leaf compare to the water potential of a root in the same plant during the same period? How does it compare to the soil underneath the plant? Please fast and properly explain.arrow_forwardDescribe the pathway water would take up the stem to the leaf of a plant. Describe the water's movement through any cells, tissues, and/or systems of the plant body.arrow_forward
- Name the pressure which is responsible for the movement of water molecules across the cortical cells of root.arrow_forwardWhat would enhance water uptake by a plant cell?(A) decreasing the Ψ of the surrounding solution(B) positive pressure on the surrounding solution(C) the loss of solutes from the cell(D) increasing the Ψ of the cytoplasmarrow_forward(b) Water absorbed by plant roots travels by different pathways from the root hairs to the xylem. Figure 5 shows these pathways in a plant root. cell A xylem vessel root hair key pathway B Tissue D Tissue E * pathway C Figure 5: Schematic representation of water movement through the tissues of a plant root (PLEASE TURN OVER) Page 6 CONT'D from Page 5 i. Explain how water moves from the root hair to the xylem vessels in the root. ii. Identify cellA, pathway B, pathway C, tissue D and tissue E in Figure 5.arrow_forward
- Describe the pathway water would follow from the soil to the stem of a plant. Describe the water's movement through the cells, tissues, and systems of the plant body.arrow_forwardWhen leaf water potential increases why does hydraulic conductivity increase as well in plants?arrow_forwardB) If you have a mesophyll cell in a leaf (a living, parenchyma cell in a leaf) with a slight positive turgor pressure (Yp = 0.01 MPa) and solutes (Ys = -3.0 MPa), and it is next to a xylem vessel element with very few solutes in the xylem sap (Ys = -0.01 MPa) but high physical tension (Yp = - 2.0 MPa), which way will water flow? a) from the mesophyll cell into the vessel element b) from the vessel element into the mesophyll cell c) neither direction. They are at equilibrium. Activa GoroSearrow_forward
- Which one of the following statement is wrong? Options Water is absorbed mainly by unicellular root hairs Cellulosic cell wall is a semi permeable membrane Pure water has maximum diffusic pressure Facilitated diffusion requires special membrane proteinsarrow_forwardWhat is the relationship between osmotic potential and plants when water with salinated water is used to water plants? E.G: How does it inhibit growth and why if the plant isn't salt tolerantarrow_forwardIn the form of schematic diagram; briefly illustrate the process that occurs during the cohesion–tension theory of sap ascent is shown.arrow_forward
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