Human Anatomy, Physiology, and Medicine. Anything human!
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Your grammar is poor and because of this it's hard to understand what you want to know.
According to dictionary.reference.com, a photoreceptor is
A nerve ending, cell, or group of cells specialized to sense or receive light.
If you look at the word, you can see that it should be anything that receives light in some way. A solar panel for solar energy generation would be a photoreceptor too.
Rob the Chemicool Mod
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The fotoreceptor is not necessarily a cell: the first fotoreceptor in the living world appears at Euglena virdis and it is an organelle. I do not know how to translate it's name(in romanian it is "stigma"). However, it moves the scourge to where the light is
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
by the way, who knows how plants detect light?
For the record, I think it's pretty good for someone from Singapore...
A photoreceptor, by definition, is a nerve bundle designed to detect the presence of light. They are connected to the Rod and Cone cells located on the back of the retina. For example, in the cones, when an orange light strikes the cell, the orange pigment dissolves. The photoreceptor bundle sends a message to the brain that says "Hey! Look! Orange!"
By detecting light, I mean how do they know when it is there
For example, the dandelion flower opens when it is light and closes when it's dark. How does the plant know when it is light or dark?
By the way, I didn't see the question was adressed to the retina. It's deffinetly a cell, as everyone said
Correct me if I'm wrong, but I think there's a pathway to detect rate of photosynthesis. I'm fairly sure that this mechanism opens the petals when the rate of photosynthesis is high enough. I.E. When the sun is up.
Since I have absolutely no idea, I guess you must be right
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