A person is finding it difficult to read a book up close but can see distant objects clearly.
(i) Describe the eye defect this person could have. (ii) Suggest how this eye defect can be corrected.
Write down the role of the iris in the eye.
Macular degeneration is an eye condition affecting central vision that can be treated using stem cells. The stem cells are harvested from the patient's own tissues rather than from a donor.
Suggest why using the patient's own stem cells is preferred in terms of the body's immune system response.
39 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.