Chapter 1 Flashcards
(17 cards)
What type of information does light provide?
(vehicles)
The direction of vehicles and the time of day
Light is essentially composed of near _______ that travel as ___
Near weightless particles that travel as waves
How can we use the wavelength of a light paricle to describe it?
Blue = ?
Red = ?
Blue = shorter wavelength= more energy of the photon
Red= longer wavelength = less energy of the photon
Animals reflect different amounts of light based on _____
How much energy they absorb
Why is grass green?
It reflects green light and absorbs all other colors
The reason for light interaction is the presence of?
Of light absorbing pigment in cells
What makes carrots orange?
Beta caratine
We have light receptors in the ____ of our eyes. After absorbing light, signal is sent by the ____ nerve to the brain where it can be interpreted.
Retina
Optic nerve
What are opsins? Where are they located? and what is their function (3)?
What: proteins
Where: in the retina (membrane of your eye)
Function: -absorbs light
- proteins change shape + send signal to the brain
What are colorblind individuals missing?
One or more opsin genes
What does the Chlamydomonas cell’s eye spot allow it to do?
It allows the cells to move in response to light
Planaria:
1) What does its eye do?
2) What does the shape of the eye allow?
1) It detects light and sends signals to its cerebral ganglion
2) It allows both intensity and direction of the light to be assesed
Deer Fly:
1) What does it do?
2) What is this type of eye good at detecting?
3) What is this type of eye NOT good at detecting?
1) Connects many individual eyes to the nervous system
2) Good at detecting movement
3) NOT good at seeing fine detail
Octopus:
1) what type of lens does it have?
2) What are some disadvantages of this eye?
1) has a single lens eye
2) No color vision, and only a simple brain to interpret the input
Which type of eye is very similar to the human eye?
The Octopus
Tarsier:
1) eyes are ___ x more sensitive to light then the human eye
2) What is the trade off? They can’t … (3)
1) 100 times
2) they can see 100x better in the dark
They can’t see color
They can’t see well during the day
Mecian Cave Fish:
What are the two types?
How long did this process take?
1) Lives above ground - has eyes
2) Lives in dark caves - lost the gene for eye development because it was not needed
Took about 10 000 years
