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Osmotic adjustment is a mechanism in plants to tolerate osmotic
stress by lowering the osmotic potential by the accumulation of
solutes, and to maintain the volume of protoplast and turgor
pressure. Osmotic adjustment occurs in leaves, hypocots, roots,
floral apex and spikelets under osmotic stress conditions. Osmotic
adjustment in the root has a different role from that in the shoot.
The role of osmotic adjustment in root elongating zone is to
maintain turgor pressure to continue root elongation and root
growth in drying soils, which enable the plant to maintain
transpiration by exploiting a greater volume of soil or utilize available water in a given soil volume more efficiently. The signifi cance of osmotic adjustment in the elongated zone of the root is to promote desiccation tolerance and to initiate lateral roots that are responsible for effi cient absorption and transport of water.
Explain how "osmotic adjustment" can be used to maintain turgor pressure as soil water content decreases.
a. What is osmotic pressure and how is used in water reabsorption in the collecting duct of the mammal kidney. b. what is the mechanism that mammals use to control the amount of water reabsorption in the collecting duct? Include drawings for a and b.
how does form and function in nephrons allow reabsorption of just enough water to maintain osmotic balance? (Hint: "salt concentration gradient" will be a key part of your answer)
Question one Find water content, weight moist soil & can = 25 g Weight can = 10g weight dry soil & can = 20 g 7. The grain size analysis for a soil is given as: Sieve No. Grain Size (mm) Passing 0.42 0.15 0.075 200 a) Plotagrain-sine distribution curve b) Determine D D and De from the grain size distribution curve c) Calculate the uniformity coefficient, d) Calculate the coefficient of curvature. Ce c) Classify the soil using the...
The following data represent soil water content (percentage of water by volume) for independent random samples of soil taken from two experimental fields growing bell peppers. Soil water content from field I: x1; n1 = 72 15.2 11.3 10.1 10.8 16.6 8.3 9.1 12.3 9.1 14.3 10.7 16.1 10.2 15.2 8.9 9.5 9.6 11.3 14.0 11.3 15.6 11.2 13.8 9.0 8.4 8.2 12.0 13.9 11.6 16.0 9.6 11.4 8.4 8.0 14.1 10.9 13.2 13.8 14.6 10.2 11.5 13.1 14.7 12.5...
The osmotic pressure of blood is 7.65 atm at 37 C. How much glucose should be used per L for an intravenous injection that is to have the same osmotic pressure as blood.(R = 8.314 (L-atm/K/mol)).
Task 3: What data storage technology can be used to maintain the legal user accounts, explain how and why9 16 pointS Task 3: What data storage technology can be used to maintain the legal user accounts, explain how and why9 16 pointS
0.0140 grams of Cr(NH3)sCls was dissolved in 25.00 mL of water to give an osmotic pressure of 128.28 mmHg at 298.0 K. How many ions were produced per molecule? Note: R - 0.0806 L atm/mol K, MM Cr(NHs)Clh 243.5 g/mol alculate the osmotic pressure as if Cr(NH3)sCls did not ionize then use the relationship t: C true vapor pressure nonionized vapor pressure
1. Intravenous, or IV solutions used in medicine must exert the same osmotic pressure as blood to prevent a net flow of water into or out of the blood cells. The proper concentration for an intravenous NaCl solution is 0.90 g NaCl per 100. mL of water (sometimes refered to as 0.90% m/v). If the van\'t Hoff factor of NaCl is i = 1.8, what is the osmotic pressure of blood at body temperature, 37
Question 3: Use drawings to explain how a bellow gauge can be used to display pressure change information as changes in length, angle and voltage. Can a bellow gauge be used to display absolute pressure? How? Question 3: Use drawings to explain how a bellow gauge can be used to display pressure change information as changes in length, angle and voltage. Can a bellow gauge be used to display absolute pressure? How?
The selenium content in soil can be determined fluorometrically upon conversion of the selenium to the fluorescent product shown, followed by extraction in cyclohexane. Emission from the fluorescent product is observed at 518 nm. The selenium content in a 0.194 g soil sample was converted to the fluorescent product and extracted in 50.0 mL of cyclohexane. The method of standard additions was used to determine the selenium content in the soil sample. Initially, 3.00 mL of the cyclohexane solution were...