Which of the following is true?a) There are no rods on the fovea.b) Cones work better under low light.c) The blind spot has a lot of cones.d) Isomerization does not influence photoreceptor membrane potentials.e) Fovea has no photoreceptors.f) Visual pigments in rods are called photopsin
Question
Which of the following is true?a) There are no rods on the fovea.b) Cones work better under low light.c) The blind spot has a lot of cones.d) Isomerization does not influence photoreceptor membrane potentials.e) Fovea has no photoreceptors.f) Visual pigments in rods are called photopsin
Solution
The correct answer is a) There are no rods on the fovea.
Here's why:
a) The fovea is a part of the eye located in the center of the retina. It contains only cones and no rods. Therefore, this statement is true.
b) Cones actually work better under bright light and are responsible for color vision. Rods work better under low light. So, this statement is false.
c) The blind spot is a part of the retina where the optic nerve leaves the eye. There are no photoreceptors (rods or cones) in this area, so this statement is false.
d) Isomerization is a process that occurs in the photoreceptors and it does influence photoreceptor membrane potentials. When light hits a photoreceptor, it causes a change in the shape of a molecule called retinal. This change triggers a series of events that leads to a change in the membrane potential. So, this statement is false.
e) The fovea is packed with the highest density of cones (a type of photoreceptor). So, this statement is false.
f) The visual pigment in rods is called rhodopsin, not photopsin. Photopsin is found in cones. So, this statement is false.
Similar Questions
Which of the following information about photoreceptors is false?a. They have inner and outer segments.b. The segments are connected by a cilium.c. They are located in the retina.d. Cones are more senstive to light than rods.e. Visual pigments in the rods are called rhodopsin.
Which statement is wrong?a)Rods present everywhere on the retina except bling spot and foveab)Cones are more sensitive to light than rodsc)Cones present mostly everywhere on the retina except the blind spot, mostly at the fovead)Rods are for monochromatic visione)Cones are dor chromatic vision
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