The eyeIB MYP Biology: Mind map

Exam questions on The eye

1. Amara walks from a bright street in Lagos into a dimly lit cinema. For a few moments she can see very little, then her vision gradually improves. When she leaves after the film, the bright sunlight is uncomfortable at first.
   Explain how Amara's pupils respond when she leaves the cinema, and why this response is useful.2 marks
2. Kenji is reading a message on his phone, held close to his face. He then looks up to read a road sign on the other side of the street.
   Explain how the eye changes so that Kenji can focus on his phone.2 marks
3. A class investigates the pupil reflex. One student sits in a room where the light intensity can be changed. After one minute of adjusting to each light level, a partner holds a ruler beside the student's eye and estimates the pupil diameter. The results were: 7.5 mm at 10 lux, 5.0 mm at 100 lux, 3.0 mm at 1000 lux and 2.0 mm at 10 000 lux.
   Describe the trend in the results and use the data to support your answer.3 marks