Eyes and Light
What must enter an eye for an animal to be able to see an object?
Light
What organ processes information received by the senses and makes decisions?
Brain
Which animal from the list do you think would have large pupils: cat, blue jay, or human?
Cat
Explain why eyes alone are not enough for survival; include the roles of the brain and body in your answer
Eyes only detect information (light/images). The brain must process that information to understand the situation and decide what to do. Then the brain sends messages to the body (muscles, fins, limbs) so the animal can move, hide, or act to survive.
What would happen if you have no bones?
You would be a pile on the floor, you wouldn't be able to move
In the eye model that we created, which part represented the regina, where the image forms?
Index card
After the brain makes a decision, what carries messages from the brain to muscles?
Nerves
Name one animal from the document that has smaller-looking pupils.
Blue jay or human or coyote)
A clear object that changes the direction of light as it passes through it
Lens
Why can't muscles move without bones?
Bones attach to muscles with tendons, which are what makes our muscles move.
Write the correct order light travels in a real eye: retina/pupil/cornea lens → ?
Which part that receives the light?
cornea lens/pupil/retina
retina
Put these steps in order for picking up a penny:
brain decides to pick up penny,
Nerves send a message to the brain
image enters eye,
brain sends message to nerves of arm and hand.
Image enters eye → nerves send message to brain → brain decides to pick up the penny → brain sends message via nerves to hand
Larger pupils always mean an animal is a predator. Explain briefly.
False. Pupils help let in more light (good for low light), not only for hunting; other factors affect pupil size
If a fish sees a shark and the brain tells it to swim away, which body part does the brain send signals to?
Fins
Animals that are mostly active at night are called ____________
nocturnal
If a fish was swimming in the ocean and saw a shark, what path would the light travel?
From the sun → to the shark → to the fish’s eye
A sleeping cat starts purring. Describe one way a human’s nervous system could respond.
Hear the purr with ears → brain processes “cat purring” → choose to pet cat or ignore; brain sends signals to arm/hand to pet
Why might owls have large pupils compared to blue jays?
Owls are active at night or in low light and need large pupils to let in more light so they can see better in the dark.
After light reaches the retina, what is the next step that leads to a movement response?
The retina sends information to the brain (via nerves); the brain processes and sends signals to muscles.
The hard parts inside many animals that help give their bodies shape
bone
If rocks block the path of light between a fish and a shark, explain why the fish cannot see the shark (use light/obstruction terms).
The rocks prevent light reflecting from the shark from reaching the fish’s eye, so no image reaches the retina.
Explain how eyes, brain, and fins (or limbs) must work together to help an animal survive when it sees danger. Use the sequence of sensing, processing, and responding.
Light from the danger enters the eyes (sensing) → eyes send signals via nerves to the brain (processing) → brain decides and sends signals to fins/limbs to swim/run away or hide
"Predators have large pupils because the main function of pupils is to help animals search for prey to survive” Explain why this is true or false.
Not all predators have large pupils and some non-predators may have large pupils for other reasons like low-light activity.
Describe one example (1–2 sentences) of how sensing, processing, and responding help a mouse survive when a cat purrs nearby.
The mouse might hear the cat purring or see it; its brain processes this as a nearby predator and sends signals to its legs to hide or run, helping it survive.
The part of the body that carries signals from the brain to the muscles
Motor Nerves