2026/2027 Alberta Biology 30: The Eye & Ear Questions and Answers (Rated A+)

2026/2027 Alberta Biology 30: The Eye & Ear Questions and Answers (Rated A+) What kind of receptor is the eye? - Answer photoreceptor What are the three layers of the eye? - Answer sclera, choroid, retina What is the function of the sclera? - Answer outer white layer; protects & provides shape What is the function of the cornea? - Answer transparent covering; protects eyes; bends light towards the pupil FIRST What is the function of the choroid? - Answer middle layer; contains blood vessels; supplies eye with nutrients & oxygen; dark pigment prevents reflection of light What is the function of the iris? - Answer muscular, colorful part; regulates the amount of light entering pupil What is the function of the lens? - Answer focuses image on retina What are the two types of photoreceptor cells? What is the difference? - Answer rods = vision in dim light; discriminate between shades of grey; see shapes and movement cones = color vision, sharp detail, activated by bright light What is the fovea centralis? - Answer highly sensitive part of retina; concentrated with cones; responsible for detailed vision