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2 marksIrritability and Response

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

Diagrams C and D in Figure 3 show two common eye defects, while Diagrams 7, 8 and 9 show three types of lenses that can be used to correct eye defects.

Sometimes contact lenses are used to correct eye defects. Suggest TWO precautions one should take when using contact lenses.

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Other parts of this question

  1. 2(a)Label the parts numbered 1 to 6 on the diagram in Figure 2.[6 marks]
  2. 2(b)The rods and cones are specialised cells of the retina which are stimulated by light. What biological term describes such cells?[1 mark]
  3. 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]
  4. 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]

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