Question

Match the columns

	I		II
1.	Fovea	a.	Provides opening for entry of light
2.	Iris	b.	Transduces RBG fight
3.	Pupil	c.	Transmits information to CNS
4.	Lens	d.	Controls amount of light entering
5.	Optic nerve	e.	Focus light on retina

A. 1 – b, 2 – d, 3 – a, 4 – e, 5 – c
B. 1 – a, 2 – b, 3 – d, 4 – e, 5 – b
C. 1 – c, 2 – a, 3 – d, 4 – c, 5 – b
D. 1 – e, 2 – a, 3 – d, 4 – c, 5 – c
E. 1 – d, 2 – a, 3 – e, 4 – b, 5 - c

Answer 1

Hint: The eye is a specialized sense organ that is capable of receiving visual images, which are then carried to the brain as electro-chemical impulses. It has a lot of components to it which helps in visualizing objects.

Complete Answer:
- Fovea: In the eye, a tiny pit located in the macula of the retina provides the clearest vision of all. The fovea is the central cavity of macula lutea, which is a yellow-pigmented spot in the eye present laterally to the blind spot. Fovea has the maximum visual resolution because it contains only cones. Cones are photoreceptor cells linked with color vision and daylight vision and give the sharpest image. The fovea is sensitive to the wavelengths of red, green, and blue lights. Detection of these colors by fovea is explained by RBG fight or RBG theory where RBG means red, green, and blue.

- Iris: Iris is a ring of tissue lying within the eye. It determines the color of the eye. It helps to regulate the amount of light entering the eye. When a bright light is present, the iris closes the pupil to let in less light. And when there is low light, the iris opens up the pupil to let in more light.

- Pupil: It is present in the center. It appears dark because the light passing into the eye is not reflected to a great extent. The main function is to control the amount of light entering the eye, and hence the light reflex.

- Lens: It is a crystalline structure, biconvex in shape that helps to focus the light rays to the back of the eye (retina). The cells in the retina absorb and convert this light into electrochemical impulses that are transferred along the optic nerve and then to the brain.
Optic nerve- It is located in the back of the eye, and is also called the second cranial nerve or cranial nerve II. The optic nerve transfers the visual information from the retina to the vision centers of the brain through electrical impulses.

Hence, the correct option is A, “1−b, 2−d, 3−a, 4−e, 5−c”.

Note: The structures and functions of the eyes are complex. Each eye constantly adjusts the amount of light entering, focuses on objects near and far, and produces continuous images that are, then, transmitted to the brain.