Evolution of the Eye

Question 1

Features of the eye and order of evolution

Answer 1

• “pits” -> photoreceptive cell -> iris -> lens -> eyes
• lens is needed to accommodate light and provide a sharper image (curvature allows for direction of light to be detected, rather than in a flat membrane system)

Question 2

Box jellyfish

Answer 2

• eyes are clustered in diff. positions
• help detect positioning relative to the canopy above, based on presence of shadows

Question 3

Pupil shape in animals

Answer 3

• vertical: for shorter “ambush” predators
• horizontal: prey can scan terrain