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C1.7.2 The Earth’s Atmosphere
Using Exam pro items to support successful outcomes
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• Learners will be able to test their progress against learning outcomes using questions from past AQA GCSE examinations
Foundation Tier ( C1 Jun 12 , 2.)
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Mark scheme- Foundation
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Q Answer Extra Information Mark (a) A- core
B- mantleC- crust
111
(b) Any 2 from:•Carbon dioxide dissolves / absorbs in water / oceans•Plants/ algae photosynthesise / absorb/ use carbon dioxide
•Marine organisms use ( dissolved) carbon dioxide to form their shells / skeletonsOr limestone was formed from shells / skeletons of marine organisms
allow reacts with water
Accept remains in plants / algae / marine organisms contain locked up carbon dioxide / carbon in the form of fossil fuelsDo not accept plants use carbon dioxide for respirationAccept carbon dioxide becomes locked up in sedimentary rocks / carbonates / limestone
Precipitation or formation of insoluble carbonates
2
Total 5
Higher Tier ( C1 Jun 12 , 4.)
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Use the information on the last two slides to answer these questions
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Mark scheme- Higher
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Q Answer Extra Information Mark
(a) Any 2 from:•Carbon dioxide dissolves in water / oceans•Marine organisms use ( dissolved) carbon dioxide to form their shells / skeletonsOr limestone was formed from the shells / skeleton of marine organisms•Plants ;/ algae photosynthesise / absorb / use carbon dioxide
Accept carbon dioxide becomes locked up in sedimentary rocks / carbonates/ limestoneOrPrecipitation or formation of insoluble carbonatesAccept remains of plants / algae / marine organisms contain locked up carbon dioxide / carbon in the form of fossil fuelsDo not accept plants use carbon dioxide for respiration
2
(b)(i) Because these gases / molecules contain the elements / atoms in amino acidsOr the gases / they contain carbon, hydrogen and nitrogen
Ignore oxygen
1
Mark scheme- Higher
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Q Answer Extra Information Mark
(b)(ii)
Any 2 from•Nobody knows what was in the Earth's early atmosphere
•There may not have been ( continuous) lightning•Miller and Urey selected only the gases needed to produce amino acids
Ignore small scale / timescaleIgnore references to water / oceans or other theories
Accept these gases / hydrogen / methane/ ammonia may not have been in the Earth's early atmosphereAccept carbon dioxide / nitrogen may have been in the Earth's early atmosphereAccept reference to Venus’ present atmosphere
2
Total 5