Question

Concerning photoreceptors:

	A.	rods are very sensitive to light and involved in black-and-white vision.
	B.	cones are found in the fovea centralis of the macula lutea.
	C.	colors are hard to distinguish in dim situations because the cones require bright illumination.
	D.	A and B are correct.
	E.	A, B, and C are correct.

Answer 1

Ans:- e) A ,B ,and C are correct.

concept:-

rods are photosensitive pigments which can detect even very minute amount of light , so they are important for night vision.

so option a is correct.

fovea centralis have high density of cons so they have max visiual aquity. So option b is correct .

Both rods and cones are sensitive to light. The difference between them is that the rods allow us to see in very dim light but don't permit detection of color, while the cones let us see color but they don't work in dim light. When it gets dark the cones lose their ability to respond to light

so option c is also correct.

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