Proton-Potassium Pump Hypothesis:
Levitt in the year 1974 combined the points in Steward’s and Scarth’s hypothesis and provide a modified version of the mechanism of stomatal movement that was termed as the proton- potassium pump hypothesis.
According to this theory K+ ions are transported into the guard cells in the existence of light. The series of events occurring are:
a. Under the influence of light, protons build up by dissociation of malic acid move from cytoplasm to the chloroplasts of guard cells.
b. To counter the exit of protons, K+ ions enter the guard cells from the nearby mesophyll cells.
c. K+ ions react with the malate ions existed in the guard cells to form potassium malate.
d. Potassium malate causes rise in the osmotic potential of guard cells causing entry of water into the guard cells as an outcome of which the stoma opens.
e. At night the dissociation of potassium malate occurs and K+ ions exit out of guard cells causing loss of water from guard cells and therefore the stoma closes.
Fritz and Noggle in 1976 supported this theory and provide a scheme for opening of stomata.
This hypothesis is the widely accepted one as Levitt was capable to explain increase in K+ ion level during the day and the formation of organic acids such as malic acid with the unused CO2 existed in the guard cells.
Latest technology based Biology Online Tutoring Assistance
Tutors, at the www.tutorsglobe.com, take pledge to provide full satisfaction and assurance in Water transport homework help via online tutoring. Students are getting 100% satisfaction by online tutors across the globe. Here you can get homework help for Water transport, project ideas and tutorials. We provide email based Water transport homework help. You can join us to ask queries 24x7 with live, experienced and qualified online tutors specialized in Water transport. Through Online Tutoring, you would be able to complete your homework or assignments at your home. Tutors at the TutorsGlobe are committed to provide the best quality online tutoring assistance for Biology homework help and assignment help services. They use their experience, as they have solved thousands of the Biology assignments, which may help you to solve your complex issues of Water transport. TutorsGlobe assure for the best quality compliance to your homework. Compromise with quality is not in our dictionary. If we feel that we are not able to provide the homework help as per the deadline or given instruction by the student, we refund the money of the student without any delay.
tutorsglobe.com performance budgeting assignment help-homework help by online budget tutors
Theory and lecture notes of Simplified Database System all along with the key concepts of Simplified Database System, Illustration of Database with Conceptual Data Model, Example of a simple Database. Tutorsglobe offers homework help, assignment help and tutor’s assistance on Simplified Database System.
Metabolic Pathways tutorial all along with the key concepts of DNA Sequencing, Chain-Termination Method, Metabolic pathways, Meaning of Metabolism, Glycolysis, Fermentation, Krebs Citric Acid Cycle and Oxidative Phosphorylation
Heat Transfer Mechanism tutorial all along with the key concepts of Heat Energy, Methods of Heat Transfer, Conductors and Insulators, Free electrons in metals, Conduction of Heat through Material, Thermal Resistance to Conduction
tutorsglobe.com money and interest assignment help-homework help by online keynesian theory of income determination tutors
Theory and lecture notes of Binomial Probabilities all along with the key concepts of Binomial probabilities, Binomial Experiment, Illustrations of binomial experiments, Binomial Probability Function, Mean, Variance and Standard Deviation. Tutorsglobe offers homework help, assignment help and tutor’s assistance on Binomial Probabilities.
Theory and lecture notes of Turing machine acceptors and decidability all along with the key concepts of turing machine acceptors and decidability, Turing Machines, Deterministic TM, Tape actions. Tutorsglobe offers homework help, assignment help and tutor’s assistance on Turing machine acceptors and decidability.
tutorsglobe.com saprotrophs assignment help-homework help by online nutrition in fungi tutors
the magnetic field tutorial all along with the key concepts of fields due to magnets, electric field to define magnetic field, field due to currents, force on a current in a magnetic field, magnetic flux density, torque on a rectangular coil and biot-savart law
eighteenth-century art assignment help allow you to relax and give some breathing space via a++ grade papers timely.
tutorsglobe.com factors of production assignment help-homework help by online meaning of production tutors
tutorsglobe.com nucleus of the organelle assignment help-homework help by online cell organelles tutors
In the integrated accounting system, various set of accounts within cost accounting and financial accounting systems are not maintained.
www.tutorsglobe.com offers solved linear programming questions, sample assignments lp questions and answers, development of lp problems, and steps to solve lp questions.
first law of thermodynamics tutorial all along with the key concepts of mathematical representation of first law of thermodynamics, internal energy, internal energy as a function of state, isothermal expansion and isothermal reversible expansion
1950499
Questions Asked
3689
Tutors
1444526
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!