Functions of the Eye and Vision

The video tutorial explains the role of receptor cells in sense organs, focusing on the eye as an example. It details the eye's structure, including the sclera, choroid, and retina, and describes how light is detected and processed by rods and cones. The tutorial also covers the front structures of the eye, such as the cornea, pupil, iris, and lens, and explains the mechanisms of iris reflex and light focusing, including accommodation and the roles of ciliary muscles and suspensory ligaments.

What is the primary function of receptor cells in sense organs?

• To generate heat

• To produce light

• To detect stimuli

• To create sound

Which layer of the eye is responsible for preventing internal reflection of light?

• Cornea

• Choroid

• Retina

• Sclera

What is the role of the retina in the eye?

• To change the shape of the lens

• To focus light

• To control the size of the pupil

• To detect light

Which part of the eye is transparent and helps in bending light?

• Cornea

• Lens

• Pupil

• Iris

What is the function of the iris in the eye?

• To supply blood to the eye

• To focus light

• To control the size of the pupil

• To detect light

How does the eye adjust to bright light conditions?

• By dilating the pupil

• By contracting the circular muscles

• By relaxing the radial muscles

• By thickening the lens

What happens to the pupil in dim light?

• It dilates

• It remains unchanged

• It becomes opaque

• It constricts

What is the term used for changing the shape of the lens to focus light?

• Refraction

• Accommodation

• Reflection

• Diffraction

How does the lens change when focusing on a nearby object?

• It becomes transparent

• It becomes opaque

• It becomes fatter

• It becomes thinner

What role do ciliary muscles play in focusing light?

• They change the thickness of the lens

• They supply blood to the eye

• They control the size of the pupil

• They detect light