TLS Online TPP Program
More Questions
TLS Online TPP Program
#Question id: 12523
#Unit 6. System Physiology – Plant
PYR/PYL/RCAR protein subfamily is conserved among plants ranging from eudicots to mosses, these subfamily is a receptor for ABA stress hormone. These are showing following characters such as;
a) PYRABACTIN RESISTANCE1 (PYR1) which shows resistance to the synthetic sulfonamide compound pyrabactin, which mimics ABA action
b) They interact with PP2C phosphatases in an ABA-independent manner to regulate the downstream activity of serine/ threonine protein kinases of the Sucrose non-Fermenting Related Kinase2 (SnRK2) family
c) the proteins are located in both the cytosol and nucleus
d) They interact with PP2C phosphatases in an ABA-dependent manner to regulate the downstream activity of serine/ threonine protein kinases of the Sucrose non-Fermenting Related Kinase2 (SnRK2) family
Which of the following combination from the above statements is correct?
TLS Online TPP Program
#Question id: 12524
#Unit 6. System Physiology – Plant
PYR/PYL/RCAR receptors to permit or enhance interaction with PP2C and thereby repress PP2C phosphatase activity. This releases SnRK2 kinases from inhibition and allow to performing various function such as;
a) phosphorylating transcription factors that bind ABA Response Elements to inhibits the ABA responsive gene expression
b) Allow phosphorylation ion channels for regulating stomatal aperture
c) phosphorylating transcription factors that bind ABA Response Elements to activates the ABA responsive gene expression
which of the following is the correct statement of kinase activity ?
TLS Online TPP Program
#Question id: 12525
#Unit 6. System Physiology – Plant
The role of ABA signaling during water stress in the guard cells in presence and absence of ABA;
a) Anion effl¬ux leads to depolarization of the plasma membrane, which drives K+ effl¬ux. The eff¬lux of ions (A– and K+) reduces the turgor pressure of guard cells, resulting in stomatal closure.
b) Both OST1 and CPKs phosphorylate and thereby activate plasma membrane anion channels, leading to ef¬flux of anions (A–). But this process can be inhibited directly by PP2Cs
c) Inhibition of PP2C activity releases the positive regulator kinase OST1 from inhibition, resulting in both phosphorylation and activation of NADPH oxidases (RBOHs)
d) RBOHs catalyze the formation of apoplastic reactive oxygen species (ROS), which triggers opening of plasma membrane Ca2+-permeable ion channels
e) The resulting elevation of cytosolic Ca2+ leads to activation of calcium-dependent protein kinases (CPKs), which can also activates the RBOH proteins further promoting Ca2+ infl¬ux into the cytosol.
Which statements belongs to the presence and absence of ABA during signalling;
I. In presence of ABA
II. In absence of ABA
Which of the following combination from the given above statements is correct?
TLS Online TPP Program
#Question id: 12526
#Unit 6. System Physiology – Plant
ABA is transported by both the xylem and the phloem, but it is normally much more abundant in ___
TLS Online TPP Program
#Question id: 12527
#Unit 6. System Physiology – Plant
Which of the following is the incorrect prediction about ABA translocation in vascular tissue by both the xylem and the phloem?
TLS Online TPP Program
#Question id: 12528
#Unit 6. System Physiology – Plant
According to a recent model, the balance between the activities of ABA and gibberellin in seeds is under both developmental and environmental control such as
a) early stages of seed development, ABA sensitivity is high and gibberellin sensitivity is low, which favors dormancy over germination
b) Later in seed development, ABA sensitivity declines and gibberellin sensitivity increases, favoring germination.
c) Environmental factors such as temperature and light affect the ABA:GA ratios by activation of the NCED and GA2ox enzyme, which promotes seed dormancy
d) During an Ambient environment, activation of GA3ox and CYP707A2 inducing dormancy
Which of the following combination from the above statements is incorrect?