2016 PSYCHOLOGY KEY TOPIC TESTTSSM 2016Page 7 of 9SECTION B- Short-answer questionsQuestion 1a.Describe the role of the following eye structures:i.Retina________________________________________________________________________________________________________________________________________________ii.Iris________________________________________________________________________________________________________________________________________________iii.pupil________________________________________________________________________________________________________________________________________________1 + 1 + 1= 3 marksb.Describe the function of the following visual structures.i.Cones________________________________________________________________________________________________________________________________________________ii.Rods________________________________________________________________________________________________________________________________________________