Question

Pigment in the cone cells of man responsible for detecting red colour is
A. Erythrolabe
B. Chlorolabe
C. Cyanolabe
D. Rhodopsin

Answer 1

Hint: Cone cells, or cones, are one of the two types of photoreceptor cells that are in the retina of the eye which is responsible for color vision as well as eye color sensitivity. They function top in relatively bright light as different to rod cells that work better in dim light.

Complete Answer:
Cone cells are photoreceptor cells in the retinas of vertebrate eyes together with the human eye. They respond in a different way to the light of different wavelengths, and are thus responsible for color vision, and function best in relatively bright light as opposed to rod cells, which work better in dim light. Cone cells are tightly packed in the fovea centralis. On the other hand, they are not present from the optic disc, contributing to the blind spot. There are six to seven million cones in a human eye and are most concentrated towards the macula.

Both rods and cones have a visual pigment. This pigment molecule which is surrounded in the cell membrane of the photoreceptor is a large protein and is called an opsin, and it is coupled with a small molecule called a chromophore that absorbs photons of light. When the chromophore absorbs light, it changes the shape and this in turn activates the large opsin molecule.

Three pigments or three types of photoreceptor cells with different combinations of three pigments could make vision capable of detecting all colors of the visible. It was found that the human retina has three types of cones, each containing a different visual pigment. These are red, green, and blue cones, each contains pigment similar to rhodopsin, the pigment found in rods.

Every type of cone cell responds to a variety of wavelengths quite than just one and their response curves overlap. Because of this overlap, each wavelength of light gives a distinctive pattern of retort in each of the three cone populations, and the pattern of signals is the code for the wavelength or color. The color is encoded in the pattern of activity of several cells. This method is similar to that for olfactory perception individual olfactory receptors give diverse responses to the same odor, and the odor is coded by the pattern of receptor activation.

The correct option is A) Erythrolabe.

Note: Cone cells are one of the three photoreceptor cells established in the retina of the mammalian cells. Absence of the cones will lead to the loss of perception of color. The human being has three diverse types of cones that divide up visual color information into red, green, and blue signals.