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What does hydraulic conductance mean in the following?
The hydraulic limitation hypothesis proposes that reduced growth in taller trees is caused by decreased photosynthesis resulting from a decrease in hydraulic conductance promoted by a longer root-to-leaf flow path.
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- Imagine you have a plant with a water potential of -0.1 MPa in the root tissue. What would happen if you place the roots of this plant in a 0.1 M solution of sucrose (water potential is -0.23 MPa)? The net water flow would be from the tissue into the sucrose solution The net water flow would occur only as ATP was hydrolyzed in the tissue The net water flow would be from the sucrose solution into the tissue The net water flow would be in both directions and the concentration of water would remain equal The net water flow would be impossible to determine from the values given hereIn a comparison of the water potential and turgor pressure of leaf cells before and after wilting, which of the following would you expect to find?Scientists 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
- Scientists 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. Please describe the results in Figure Figure 1. Changes in leaf hydraulic conductance during the wet and dry season transition of a subtropical speciesThe following are some statements about long distance translocation of photo assimilates in higher plants: P. Sugars are translocated in the phloem by mass transfer along a hydrostatic pressure. Q. The translocated carbohydrates are mostly nonreducing sugars R. Munch pressure-flow hypothesis is crucial to drive translocation in the phloem S. Allocation and partition of carbon within a source leaf determine the phloem loading phenomenon Which of the following combinations of the above statements is true? OP, Q, and R OP. R and S OP, Q, R and S OP, Q, and SWhen considering the loading and unloading of photosynthate from the phloem, which of the following is FALSE? Select one: a. Apoplastic phloem unloading enables the import of sugars against their concentration gradient into sink tissue. b. In apoplastic loading, the solute potential of the companion cells is more negative than the apoplastic space nearby. c. In apoplastic loading, proton pumps create electrochemical gradients that can be used by symporter proteins to import sugars into the companion cell. d. All the statements are true. e. Symplastic loading relies on diffusion of the sugars through plasmodesmata from photosynthetic cells to the phloem cells.
- Consider a soil with the following properties: The water content at the permanent wilting point is 0 = 5 Vol.% The actual plant available water accounts for 3 Vol.% The water content at saturation is 0,-38 Vol.% The water content at a suction of 10 cm is 35 Vol.% a) What is the field capacity of your soil? State the calculation, not only the result. b) What matric potential (suction) values do you assume for the wilting point and field capacity of your soil?Describe 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.Among the three pathways of water movements in plants, which is the most used? Explain the reasons behind. (i) Figure 1: Water droplets on leaf blades (IPM, University of Missouri) Explain the phenomenon shown in Figure 1 by providing the specific term, elucidating the reason, conditions and plant structure involved. (ii)
- Water ascent up a plant is vital for maintaining proper physiological function of the leaves, (a) is root pressure or the cohesion-tension theory MORE important in supplying water to the leaf? (b) explain the difference in the driving force of water ascent between root pressure and cohesion tension.Discuss other morphological differences between sunny and shady set-ups of mung bean in relation to phototropic response of plants. Characteristics sunny shaded Leaf color Lime Green Pale Green Direction of Growth Grows upward towards the direction of sunlight Oriented in the direction of the light but growth is bent downwardWhich phloem loading will involve sucrose-proton transporter and what are the correlating factors in determining the type of phloem loading pathways? *