photreceptor cells animals

Question 1

BEES structure

Answer 1

• compound eyes
• 1o’s of single eyes (lense) called ommatidia, with lense pointing in all direction

-have a cluster of photoreceptors surrounded by support cells and separated by pigment cells

LOCATION OF NUERONES
-at the end of ommatidia, at the back of eye linking to optic nerve

Question 2

BEES ability to perceive colour

Answer 2

• trichromatic vision (yellow, blue, green)
• can see UV radiation, but not red
• type of image: mosaic image of visual field
• similarity detects light
• difference: has many ommatidia and can detect colour (can be more efficient detecting movement than mammals.

Question 3

FLATWORMS

Answer 3

• photorecptors in the ocelli (light sensitive cup)
  type: eyecup
  image: if formed is unclear and not inverted, gives info about light intensity and direction
  difference: fewer photoreceptor cells than insect or mammal and has poor visual accuity

Question 4

MAMMAL

Answer 4

VERTEBRATE EYE
type of photoreceptor: lense
type of image: image on retina is inverted and diminished
-similarity: detects light
-difference higher resolving power and greater visual accuity

Question 5

desribe and analyse use of colour for communication in animals

Answer 5

birds -communicate by colour to signal breeding times, courtship, to signal threats

-colour extensively used in birds for sexual dimorphism and used in camouflage and mimicry.