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CBNS practice Questions with Detailed Verified Answers
Which layer of retinal neurons has axons that leave the retina?
a. Outer Nuclear layer
b. Inner Nuclear layer
c. Ganglion cell layer
d. Inner plexiform layer Ans: ✓ ✓ ✓ C. Ganglion cell layer
The ganglion cell layer contains the cell bodies of the ganglion cells. These are the only cells with
axons that leave the retina
What is the spectral sensitivity of the free cone pigments?
a. 460 nm
b. 560 nm
c. 430 nm
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d. 530 nm Ans: ✓ ✓ ✓ d. 530 nm
The cones in our retinas contain one of three opsins. These opsins give the photopigments different
spectral sensitivities. Green cones are maximally activated by the light with a wavelength of about
530 nm.
What is reflection? Ans: ✓ ✓ ✓ c. Light rays bouncing off a surface
Why is the retina said to be duplex? Ans: ✓ ✓ ✓ Because it can work under both scotopic and
photopic lighting conditions
Why do we say that ganglion cells are mainly responsive to differences in illumination that occur
within their receptive fields? Ans: ✓ ✓ ✓ Center surround ganglion cells respond best when a light
or dark edge falls at the boundary between the center and surround regions of the receptive field
Distinguish the responses of M type and P type retinal ganglion cells to stimulation of their
receptive field centers Ans: ✓ ✓ ✓ M cells respond with a transient burst of action potentials and
P cells respond with a sustained discharge.
What is the role of the pupil in vision?
a. carries axons from the retina
b. Protects the transparent surface of the eye
c. Provides color to the eye
d. Allows light to enter the eye and reach the retina. Ans: ✓ ✓ ✓ D.
Which retinal neurons fire action potentials?
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CBNS practice Questions with Detailed Verified Answers
Which layer of retinal neurons has axons that leave the retina?
a. Outer Nuclear layer
b. Inner Nuclear layer
c. Ganglion cell layer
d. Inner plexiform layer Ans: ✓ ✓ ✓ C. Ganglion cell layer
The ganglion cell layer contains the cell bodies of the ganglion cells. These are the only cells with
axons that leave the retina
What is the spectral sensitivity of the free cone pigments?
a. 460 nm
b. 560 nm
c. 430 nm
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, Click here for more: Scholars nexus
d. 530 nm Ans: ✓ ✓ ✓ d. 530 nm
The cones in our retinas contain one of three opsins. These opsins give the photopigments different
spectral sensitivities. Green cones are maximally activated by the light with a wavelength of about
530 nm.
What is reflection? Ans: ✓ ✓ ✓ c. Light rays bouncing off a surface
Why is the retina said to be duplex? Ans: ✓ ✓ ✓ Because it can work under both scotopic and
photopic lighting conditions
Why do we say that ganglion cells are mainly responsive to differences in illumination that occur
within their receptive fields? Ans: ✓ ✓ ✓ Center surround ganglion cells respond best when a light
or dark edge falls at the boundary between the center and surround regions of the receptive field
Distinguish the responses of M type and P type retinal ganglion cells to stimulation of their
receptive field centers Ans: ✓ ✓ ✓ M cells respond with a transient burst of action potentials and
P cells respond with a sustained discharge.
What is the role of the pupil in vision?
a. carries axons from the retina
b. Protects the transparent surface of the eye
c. Provides color to the eye
d. Allows light to enter the eye and reach the retina. Ans: ✓ ✓ ✓ D.
Which retinal neurons fire action potentials?
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