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4 marksSense Organs and Coordination

CSEC Integrated Science · May/June 2011 · Paper 2 · Question 3(a)(iii)

A carpenter left tools outdoors in the sun. On returning, the wooden hammer handle felt warm while the metal nail felt hot.

Explain how the nervous system causes the carpenter to automatically drop the hot nail upon picking it up.

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Other parts of this question

  1. 3(a)(i)Suggest how heat energy is transferred from the sun to the tools.[2 marks]
  2. 3(a)(ii)Explain why the wooden handle of the hammer and the nail reached different temperatures.[2 marks]
  3. 3(a)(iv)Name the process by which heat is transferred from the hot nail to the carpenter's hand.[1 mark]
  4. 3(a)(v)Explain how wearing a glove made of thick cloth prevents the carpenter's hand from being burned by a hot nail.[1 mark]
  5. 3(b)(i)Define what is meant by convection in relation to heat transfer.[1 mark]
  6. 3(b)(ii)Indicate the most likely direction of airflow by drawing arrows at positions A and B on Figure 4.[1 mark]
  7. 3(b)(iii)Explain why the air circulates in the direction indicated in Figure 4.[3 marks]

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