The eye

What is the main subject shown in the images under the title 'The eye'?

• The eye

• The ear

• The nose

• The mouth

How many different eyes are shown in the image titled 'The eye'?

• Six

• Two

• Four

• Eight

Fill in the blank: Sense organs are groups of ________ cells responding to specific stimuli such as light, sound, touch, temperature, and chemicals.

• receptor

• muscle

• nerve

• blood

Identify the structures of the eye, limited to cornea, iris, pupil, lens, retina, optic nerve and blind spot. Which of the following is NOT a structure of the eye?

• Cornea

• Iris

• Heart

• Retina

Describe the function of the cornea. Fill in the blank: The cornea ________ light.

• refracts

• absorbs

• reflects

• blocks

Describe the function of the iris. Fill in the blank: The iris controls how much ________ enters the pupil.

• light

• sound

• air

• water

Describe the function of the lens. Fill in the blank: The lens focuses light onto the ________.

• retina

• cornea

• iris

• pupil

Describe the function of the retina. Fill in the blank: The retina contains ________ receptors, some sensitive to light of different colours.

• light

• sound

• pressure

• temperature

Describe the function of the optic nerve. Fill in the blank: The optic nerve carries impulses to the ________.

• brain

• lungs

• stomach

• muscles

Explain the pupil reflex in terms of light intensity and pupil diameter only. What happens to the pupil diameter in bright light?

• Increases

• Decreases

• Stays the same

• Disappears