Category: CSIR NET Life Science Previous Year Questions and Solution on Sensory System

The release of which neurotransmitter from the rods of retina is reduced when light strikes its outer segment? (1) Glutamate (2) Acetylcholine (3) GABA (4) Glycine Photoreceptors in the retina, […]

Upon prolonged illumination, activated rhodopsin does not activate transducing, hence the vision is impaired. This could be because of the following explanations: A. Most of the activated rhodopsin gets phosphorylated […]

When rods of retina kept in dark, were exposed to light, photo transduction occurred. Following are some explanations given by a researcher regarding phototransduction: A. Activation of transducin B. Inhibition […]

Which one is the correct sequence of events that takes place during phototransduction when light falls onto the retina? (1) Closure of Na+ channels → activation of transducing decreased release […]

The dark current in retina is due to (1) Closing of Na+ channels in the outer segment of photoreceptors. (2) Opening of K+ channels in the inner segment of photoreceptors […]

In the dark, rods show a large inward “dark” current which is suppressed by a flash of light. Which one of the following statements, explaining the effect of light, is […]

A majority of humans with normal colour vision was found to be more sensitive to red light in Rayleigh match, where the subject mixed variable amount of red and green […]

The probable effects of lesion of left optic tract on the vision of a human subject are given below. Identify the correct statement. (1) Blindness in the left eye but […]

When a person enters a dark room from bright sunlight he cannot see anything for a few seconds because (1) Rhodoposin pigment is light inactivated (2) Scotopsin proteins of rods […]

In a normal human eye, for sharp image formation on the retina, maximum dioptric power is provided by the (1) retina (2) cornea (3) anterior surface of the lens (4) […]