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Grade 12 Revision

Grade 12 Revision. Last minute hints: Choose your essays carefully. Don’t switch midway through one. 2 laws of thermo:. 1 – energy lost as heat energy 2 – transformations lead to loss of useable energy on the way (need sun to keep adding useable energy). feedback. + ve ice

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Grade 12 Revision

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  1. Grade 12 Revision Last minute hints: Choose your essays carefully. Don’t switch midway through one.

  2. 2 laws of thermo: 1 – energy lost as heat energy 2 – transformations lead to loss of useable energy on the way (need sun to keep adding useable energy)

  3. feedback +ve ice -ve clouds

  4. keys Dichotomous – physical characteristics Yes No answers ( no size) (No things you can’t see)

  5. Simpsons • Remember to do n(n-1)

  6. Lincoln • Capture mark release capture • Set free (ethics) Unmark/untag if possible n1 – caught n2 – recaptured m – marked N total population

  7. Systems diagrams • Boxes arrows • Width/size proportional • No pictures/drawings

  8. Tree system • Learn it no drawing of trees

  9. NPP = GPP – R • NSP = GSP – R (GSP is foot eaten plus faecal loss)

  10. Log scale No. of individuals % lifespan

  11. Transects • Diversity change along env. Gradient • Belt • Line • Quadrat • Random numbers

  12. SY What is there at the end - what was there at the beginning Individuals Kg of biomass If you take more than this it is UNSUSTAINABLE

  13. What are the main causes for mass extinctions? (3) The main causes for mass extinctions are… don’t waste time Volcanic eruptions caused… Meteorites… Humans…

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