Igcse 2010 REVISION photosynthesis

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photosynthesis
IGCSE Revision


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  • 1st answer is wrong. Green plants take in Carbon Dioxide and send out Oxygen
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  • nice one thanks for sharing...:)
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Igcse 2010 REVISION photosynthesis

  1. 1. Photosynthesis Mainly based on the exercises from http://www.biology-resources.com/biology-questions.html IGCSE Revision Questions http://biodeluna.wordpress.com
  2. 2. <ul><li>To start with: </li></ul><ul><li>The Photosynthesis Song from Simple Science on Vimeo . </li></ul><ul><li>Found at </li></ul><ul><li>http://www.clickbiology.com/onlyphotosynthesis-song/ </li></ul>
  3. 3. <ul><li>Which of these statements is most accurate? </li></ul><ul><li>In bright sunlight a green plant will be </li></ul><ul><li>photosynthesising only </li></ul><ul><li>respiring only </li></ul><ul><li>photosynthesising and respiring </li></ul><ul><li>taking in oxygen and giving out CO2 </li></ul>
  4. 4. <ul><li>Which of these statements is most accurate? </li></ul><ul><li>In bright sunlight a green plant will be </li></ul><ul><li>photosynthesising only </li></ul><ul><li>respiring only </li></ul><ul><li>photosynthesising and respiring </li></ul><ul><li>taking in oxygen and giving out CO2 </li></ul>
  5. 5. Equation which summarises the process of photosynthesis
  6. 6. 6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2 glucose Photosynthesis (from the Greek φώτο- [photo-] , &quot;light,&quot; and σύνθεσις [synthesis] , &quot;putting together&quot;, &quot;composition&quot;) is a process that converts carbon dioxide into organic compounds , especially sugars , using the energy from sunlight http://en.wikipedia.org/wiki/Photosynthesis
  7. 7. A leaf is detached from a tree and tested with iodine. The leaf turns dark blue. <ul><li>What does this result tell you? </li></ul><ul><li>(b) Why is this result not sufficient evidence to confirm that photosynthesis had taken place in the leaf? </li></ul>http://the-herb-store.com/catalog/index.php?cPath=21_27
  8. 8. A leaf is detached from a tree and tested with iodine. The leaf turns dark blue. <ul><li>What does this result tell you? </li></ul><ul><li>Why is this result not sufficient evidence to confirm that photosynthesis had taken place in the leaf? </li></ul>http://the-herb-store.com/catalog/index.php?cPath=21_27 Starch is present .
  9. 9. A leaf is detached from a tree and tested with iodine. The leaf turns dark blue. <ul><li>What does this result tell you? </li></ul><ul><li>Why is this result not sufficient evidence to confirm that photosynthesis had taken place in the leaf? </li></ul>http://the-herb-store.com/catalog/index.php?cPath=21_27 Starch is present . Unless the leaf is known to have been free from starch at the beginning of the experiment you cannot conclude that photosynthesis has occurred. The starch might be permanently present in this leaf. Also, in the absence of an experimental design (with a control ), there is no telling where the starch has come from. It might have been produced from sucrose which was transported to the leaf from another part of the plant.
  10. 10. What 4 things might affect the rate of photosynthesis ? http://www.s-cool.co.uk/gcse/biology/photosynthesis/test-its/photosynthesis-exam-testit.html
  11. 11. What 4 things might affect the rate of photosynthesis ? <ul><li>water </li></ul><ul><li>carbon dioxide </li></ul><ul><li>sunlight </li></ul><ul><li>temperature </li></ul>http://www.s-cool.co.uk/gcse/biology/photosynthesis/test-its/photosynthesis-exam-testit.html
  12. 12. Name the regions A to D. http://www.s-cool.co.uk/gcse/biology/photosynthesis/test-its/photosynthesis-exam-testit.html
  13. 13. Name the regions A to D. <ul><li>A is a Palisade Cell </li></ul><ul><li>B is a Guard Cell </li></ul><ul><li>C is a Stoma </li></ul><ul><li>D is Air Space </li></ul>http://www.s-cool.co.uk/gcse/biology/photosynthesis/test-its/photosynthesis-exam-testit.html
  14. 14. <ul><li>What additional substances does a plant need to make amino acids and proteins from glucose? </li></ul><ul><li>Where do these substances come from? </li></ul>
  15. 15. <ul><li>What additional substances does a plant need to make amino acids and proteins from glucose? </li></ul><ul><li>Where do these substances come from? </li></ul>To make amino acids and proteins from glucose, a plant needs a supply of nitrate (for nitrogen ) and sulphate (for sulphur ).
  16. 16. <ul><li>What additional substances does a plant need to make amino acids and proteins from glucose? </li></ul><ul><li>Where do these substances come from? </li></ul>To make amino acids and proteins from glucose, a plant needs a supply of nitrate (for nitrogen ) and sulphate (for sulphur ). These substances come from the soil.
  17. 17. Which of these processes increase the concentration of carbon dioxide in the atmosphere? <ul><li>(a) Respiration </li></ul><ul><li>(b) Photosynthesis </li></ul><ul><li>(c) Combustion </li></ul><ul><li>(d) Decay </li></ul>
  18. 18. Which of these processes increase the concentration of carbon dioxide in the atmosphere? <ul><li>(a) Respiration </li></ul><ul><li>(b) Photosynthesis </li></ul><ul><li>(c) Combustion </li></ul><ul><li>(d) Decay </li></ul>
  19. 19. Why do plants store some of the sugar they make as starch? http://www.s-cool.co.uk/gcse/biology/photosynthesis/test-its/photosynthesis-exam-testit.html
  20. 20. Why do plants store some of the sugar they make as starch? <ul><li>Plants could use starch or glucose. Starch is insoluble, while glucose is soluble. </li></ul><ul><li>This means that if starch is used, less water is required to keep its food stored. </li></ul>http://www.s-cool.co.uk/gcse/biology/photosynthesis/test-its/photosynthesis-exam-testit.html
  21. 21. What gases will be taken in and given out by a green plant <ul><li>(a) in darkness, </li></ul><ul><li>(b) in bright sunlight? </li></ul>furnitureclinic.co.uk
  22. 22. What gases will be taken in and given out by a green plant <ul><li>(a) in darkness, </li></ul><ul><li>(b) in bright sunlight? </li></ul>furnitureclinic.co.uk taking in oxygen and giving out carbon dioxide.
  23. 23. What gases will be taken in and given out by a green plant <ul><li>(a) in darkness, </li></ul><ul><li>(b) in bright sunlight? </li></ul>furnitureclinic.co.uk taking in oxygen and giving out carbon dioxide. taking in carbon dioxide giving out oxygen Water vapour will also be escaping from the leaf; more so in sunlight.
  24. 24. The process of aerobic respiration requires <ul><li>A food source, oxygen, enzymes, a blood supply </li></ul><ul><li>A food source, carbon dioxide, enzymes </li></ul><ul><li>Oxygen, enzymes, sunlight </li></ul><ul><li>A food source, oxygen, enzymes </li></ul>
  25. 25. The process of aerobic respiration requires <ul><li>A food source, oxygen, enzymes, a blood supply </li></ul><ul><li>A food source, carbon dioxide, enzymes </li></ul><ul><li>Oxygen, enzymes, sunlight </li></ul><ul><li>A food source, oxygen, enzymes </li></ul>
  26. 26. Fill in the missing words... <ul><li>Water moves from the soil into the roots by ___(i)___ and then flows steadily up the ___(ii)___ . As water is lost from the leaf by ___(iii)___ more water is drawn up through the ___(iv)___ to replace it. The roots have root ___(v)___ to increase their ___(vi)___ and so allows more water to be absorbed. </li></ul>http://www.s-cool.co.uk/gcse/biology/plant-growth/test-its/plant-growth-exam-testit.html
  27. 27. Fill in the missing words... <ul><li>Water moves from the soil into the roots by ___(i)___ and then flows steadily up the ___(ii)___ . As water is lost from the leaf by ___(iii)___ more water is drawn up through the ___(iv)___ to replace it. The roots have root ___(v)___ to increase their ___(vi)___ and so allows more water to be absorbed. </li></ul>http://www.s-cool.co.uk/gcse/biology/plant-growth/test-its/plant-growth-exam-testit.html <ul><li>osmosis; </li></ul><ul><li>(ii) xylem; </li></ul><ul><li>(iii) transpiration; </li></ul><ul><li>(iv) xylem; </li></ul><ul><li>(v) hairs; </li></ul><ul><li>(vi) surface area . </li></ul>
  28. 28. http://es.dreamstime.com/foto-de-archivo-smiley-del-emoticon-image11812570

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