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TLS Online TPP Program

#Question id: 11134

Which of the following statements concerning synaptic transmission is correct?

#Unit 7. System Physiology – Animal
  1. When a specific population of synaptic terminals is spread over the considerable surface of a neuron, their collective effects cannot spatially summate and lead to initiation of an action potential
  2. Even if the successive discharges of an excitatory synapse occur sufficiently close in time, they cannot temporally summate and initiate an action potential
  3. A neuron is “facilitated” when its membrane potential is moved in the less negative or depolarizing direction
  4. Even when rapidly stimulated by excitatory synaptic input for a prolonged period of time, neurons typically do not exhibit synaptic fatigue
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TLS Online TPP Program

#Question id: 10410

#Unit 6. System Physiology – Plant

phytochrome red and far-red light. Given below experiment of lettuce seed, which of the following option will be incorrect?
TLS Online TPP Program

#Question id: 10411

#Unit 6. System Physiology – Plant

Phytochrome chromophore which absorbs light known as Phytochromobilin , that are synthesized in
TLS Online TPP Program

#Question id: 10412

#Unit 6. System Physiology – Plant

Red and far-red lights are perceived by plants through various photoreceptors including phytochromes. The red/far-red reversibility of seed germination was due to the-
a) photoreversibility of phytochrome
b) presence of red and far-red light at different fluence rate
c) Conversion of Pr to Pfr form through the effect of red light
d) equal proportion of red and far red light at same fluence rate
Which of the following combinations is correct?
TLS Online TPP Program

#Question id: 10413

#Unit 6. System Physiology – Plant

Following are certain statements are related to the effect of red and far-red light;
a) under a dense canopy much of the red light is absorbed by plant pigments, resulting in transmittance of mostly far-red light
b) Pr (red) has highest photon flux at 680 nm while Pfr (far-red) has highest photon flux at 730nm
c) Pfr far-red light–absorbing form, which is considered to be the physiologically active form of phytochrome
d) R:FR ratio is strongly affected by the presence of a canopy because chlorophyll absorbs far-red but not red light
Which one of the combinations of above statements is incorrect?
TLS Online TPP Program

#Question id: 10414

#Unit 6. System Physiology – Plant

Plants have evolved with multiple photoreceptors, Phytochrome is one of them. Which of the following statements is incorrect about these photoreceptors?
TLS Online TPP Program

#Question id: 10415

#Unit 6. System Physiology – Plant

Bacterial phytochromes are light-dependent kinases Which of the following classes of kinases does it represent?