Unit Test C: Eyes and Light

Photoreceptor cells are specialized cells that can detect light. What do you think the prefix "photo-" means?

• light

• pictures

• idk

• 

The retina is at the back of the eye, and it detects light. What are the three primary colours of light that it can detect?

• red blue green

• red blue yellow

• red green yellow

• blue green yellow

When you mix red and green light, what colour will the eye detect?

• brown

• yellow

• cyan

• magenta

Plants absorb light to make food in a process called photosynthesis. Which colour of light do most leaves reflect instead of absorbing?

• red

• yellow

• green

• purple

Which three primary colours do the pixels in our screens mix to create every colour we can see?

• black white red

• red green blue

• cyan magenta yellow

• red blue yellow

What is the reason why the aperture in a camera and the pupil in an eye can both change sizes?

• to make a picture

• to look cool

• idk

• to control how much light can pass through

Which eyeball is seeing clearly, and won't need glasses?

• 
• 
• 

Which eyeball is near-sighted, and will need glasses to see things that are far away?

• 
• 
• 

Which eyeball is far-sighted, and will need reading glasses?

• 
• 
• 

The optic nerve's function is...

• making people nervous

• stopping your eyeballs from falling out of your head

• it has no function

• to carry signals from the eye to the brain