GCSE OCR 20th Century Science: Unit 4: Ideas in Context: To cull or not to cull? / Cleaning up the Marshall Islands / Call to ban food colourings

An easy revision guide for the GCSE Science Unit 4 Ideas Exam (June 2010). It analysis of the articles "To cull or not to cull?", "Cleaning up the Marshall Islands", "Call to ban food colourings" and some key terms. Enjoy and Good Luck.

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  • Created by: Ciaran
  • Created on: 27-05-10 18:20

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GCSE
By Ciaran O'Connell




[SCIENCE IDEAS PAPER CORE]
B2 ­ To cull or not to cull?, P3 ­ Cleaning up the Marshall Islands, C3 ­ Call to ban food
colourings

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Contents
B2: To cull or not to cull?
Key Terms
What you need to know
P3: Cleaning up the Marshall Islands
Key Terms
What you need to know
C3: Call to ban food colourings
Key Terms
What you need to know

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B2: To cull or not to cull?
Key Terms

Tuberculosis (TB) ­ A potentially fatal contagious disease that can affect almost any part of
the body but is mainly an infection of the lungs. It is caused by a bacterial microorganism.

Antibiotics ­ Bacteria and fungi can be killed by…

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What you need to know

1. Explain what TB is how it is caused

Tuberculosis is a disease caused by a bacterium.



2. Explain how TB is controlled in humans in the UK. And how this mechanism works in
our bodies to prevent us from getting TB

The discovery of…

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7. Why do you think the scientists asked to investigate the question `Do badgers spread
TB in cattle?'

I think scientists asked to investigate this because the results would provide a clearer understanding
of whether or not the badgers spread TB in cattle. And by obtaining an answer to this…

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12. Did the study answer the question `Do badgers spread TB to cattle?' Explain your
answer

The results did not definitely prove that badgers spread TB to cattle. In fact, the incidence of Tb in
cattle increased in areas where badgers were culled.



13. How did the scientists interpret the…

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Is the An opinion An A fact An
quote `an opinion opinion
opinion'
or `a fact'?




Analysis of The culling of This is a This is true, and I disagree
badgers is cruel theory which this can be proven with this
quote for ethical attempts to by the results of…

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Person Jane Ranjit Peter Stella

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P3: Cleaning up the Marshall Islands
Key Terms

Nuclear Weapons ­



Fission ­ A fission reaction takes place in the nucleus of the atom and different elements
are formed. A neutron is absorbed by a large and unstable uranium nucleus. This splits the
nucleus into two, roughly equal-sized, smaller nuclei…

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contain surplus energy. It emits this as gamma radiation, a very high frequency
electromagnetic radiation.



Ionising radiation ­ High-energy radiation capable of producing ionisation in substances
through which it passes, including alpha, beta and gamma.



Alpha radiation ( ) ­ Has a strong ionising power however is absorbed by a…

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