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1 markIrritability and Response

CSEC Biology · May/June 2009 · Paper 2 · Question 2(b)

The rods and cones are specialised cells of the retina which are stimulated by light. What biological term describes such cells?

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  1. 2(a)Label the parts numbered 1 to 6 on the diagram in Figure 2.[6 marks]
  2. 2(c)Severe lack of Vitamin A can result in the cornea of the eye becoming dry and thickened. Explain how this condition would affect a person's ability to see.[2 marks]
  3. 2(d)(i)Identify the eye defects and the lenses in Figure 3 that can be used to correct the defects. Diagram C Eye defect: Corrective lens: Diagram D Eye defect:…[4 marks]
  4. 2(d)(ii)Sometimes contact lenses are used to correct eye defects. Suggest TWO precautions one should take when using contact lenses.[2 marks]

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