The mechanisms that regulate the loading of sucrose from the apoplast to the sieve elements by the sucrose–H+ symporter await characterization. Possible regulatory factors include the following:

a) The solute potential or, more likely, the turgor pressure of the sieve elements

b) Sucrose concentration in the apoplast

c) The available number of symporter protein molecules

Which one of the mechanism that involve to regulate the loading of sucrose?

TLS Online TPP Program

#Question id: 29453

#Unit 6. System Physiology – Plant

Which of the following technique will be most effective for IAA concentrations of about 0.02 to 0.2 mg L–1

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#Question id: 29454

#Unit 6. System Physiology – Plant

Identify A, B and C in auxin synthesis

a. Tryptophan (Trp)----------A-------------→ Indole-3-pyruvic acid 

b. (IPA) -----------B------------→ Indole-3-acetaldehyde (IAld)

c. Indole-3-acetaldehyde (IAld) ------------C-----------→ I3AA

TLS Online TPP Program

#Question id: 29455

#Unit 6. System Physiology – Plant

which of the following auxin derivates compound that provide broad‐spectrum control of fungal pathogens

TLS Online TPP Program

#Question id: 29456

#Unit 6. System Physiology – Plant

In maize kernels, IAA also appears to be synthesized by a tryptophan independent pathway via

TLS Online TPP Program

#Question id: 29457

#Unit 6. System Physiology – Plant

Covalent conjugation of amino acids to IAA can also result in permanent inactivation (storage or degradation), here certain combination is given (∧ shows conjugation)

a. IAA ∧ myo-inositol/Gluc/Ala/Leu/Me ---Reversible (storage)

b. IAA ∧ myo-inositol/Gluc/Ala/Leu/Me ---irreversible (degradation)

c. IAA ∧ oxIAA/GH3-Asp-Glu/3-Methyleneoxidole ---Reversible (storage)

d. IAA ∧ oxIAA/ GH3-Asp-Glu/3-Methyleneoxidole---irreversible (degradation)

Which of the following is correctly paired

TLS Online TPP Program

#Question id: 29458

#Unit 6. System Physiology – Plant

Which of the following is an essential for AUXIN transport in cell called as chemiosmotic model of auxin transport