An adult can see distant road signs clearly but close print is blurred. Convex spectacles make the print clear. A second adult sees print sharply but cannot distinguish red from green, so files are identified by patterns as well as colours.
Which statement explains why these approaches are suitable?
Convex spectacles reduce refraction so light from close print focuses on the retina; patterns make the faulty cone cells produce normal impulses.
Convex spectacles allow more light through the pupil so close print is brighter; patterns move the coloured images onto the fovea.
Convex spectacles shorten the eyeball so the retina is nearer the lens; patterns enable the brain to replace impulses not sent by cones.
Convex spectacles add refraction so light from close print focuses on the retina; patterns convey information without relying on colour signals that faulty cone cells do not produce.
135 exam-style questions on OCR GCSE Biology 3.1 Coordination and control – the nervous system, covering 3.1.1 Structure of the nervous system, 3.1.2 Coordinated response, 3.1.3 The reflex arc, 3.1.4 Structure of the eye, 3.1.5 Defects of the eye, 3.1.6 Structure and function of the brain, 3.1.7 Difficulties of investigating brain function, and 3.1.8 Limitations in treating nervous system damage. Each one has a worked solution and a mark scheme showing where the marks go.