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How would a reduction in the number of aquaporin
channels affect a plant cell’s ability to adjust to new
osmotic conditions?
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- Define the concept of osmotic adjustment in root cells and how its occurrence is of benefit to plant survival.Name the process by which intact plant cells lose water in the form of droplets from leaf margins.Explain what would happen if a plant cell was placed in a hypotonic environment and why (be sure to include solute concentrations, water movement and turgor pressure in your explanation)?
- You place a flaccid plant cell (Ψ = -0.7 MPa) into an environment (beaker) of pure (deionized) water (Ψ = 0 MPa). Compare the initial conditions of the flaccid cell and the environment (beaker of pure water) in terms of: G) Predict the direction of water movement (into the cell, out of the cell, or no net movement) H) Predict the change in turgor pressor of the cell (increase turgor pressure or decrease turgor pressure) I) Predict the fate of the cell (plasmolyzed, turgid, or lysed)What 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 tolerantScientists studied what caused leaf shedding in a drought deciduous (=shedding leaves during the dry season) subtropical species. They quantified the quantum yield (=efficiency) of the PSII complex and the leaf hydraulic conductance (=efficiency of leaf water movement) in leaves of that species during the wet to dry transition Explain the results in the context of what could drive leaf shedding in this species? Figure 1. Changes in leaf hydraulic conductance during the wet and dry season transition of a subtropical species
- 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 proteinsDuring a hurricane, salt water invades fresh wate marshes ausing many of the plants to die and utimately the loss of soil. The plants are killed because the salt-water solution is ____ to the planets drawing water from the plant cells.a). hypertonicb). isotonicc). mestonicd). hypotonicField Capacity occurs at a water concentration when; Group of answer choices a. The water attached to the soil particle can’t be pulled off by the plant. b. When the soil is saturated c) All free water has drained from the soil and that remaining is held to the soil particle against gravitational pull. d) All of the above
- In the transport of an ion from the soil solution to the xylem, what is the minimum number of times it must cross a cell membrane? What transport mechanisms are likely to be involved at each membrane?Explain the concept of Water Uptake and Transport ?Imagine a cell with a water potential of –0.1 MPa being placed in a beaker of solution that also has a water potential of –0.1 MPa. Are the two water potentials in equilibrium? Would any water molecules be moving between the cell and the solution? Would there be a net movement of water? Now imagine a root in moist soil, and imagine that the root cortex cells have a water potential of –0.1 MPa and that the soil solution also has a water potential of –0.1 MPa. Would there be any net movement of water into the root?