GCSE Biology – Testing for starch in plants

Last updated: 01/07/2020
OCR Gateway GCSE Science – Combined science foundation Photosynthesis GCSE Biology – Testing for starch in plants

Learning Objectives

-I can explain investigations into how and why a plant is destarched
-I can explain investigations into testing for starch

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  1. Current
  2. Review
  3. Answered

  1. What must be done to a plant before carrying out a photosynthesis practical?

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  2. Where is a plant placed to destarch?

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  3. When destarching a plant, how long is it kept in the dark?

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  4. What is starch made from?

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  5. How can you test to see if a plant has been fully destarched?

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  6. What will a plant test positive for if it has photosynthesised?

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  7. When testing for starch, what should a plant be placed in initially?

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  8. What type of water should the plant be placed in initially?

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  9. Why is the plant placed in boiling water?

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  10. How long should the plant be left in water for?

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  11. After placing the plant in water, what should the plant be added to?

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  12. What type of ethanol should be used?

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  13. What is removed when the plant is placed in ethanol?

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  14. After the leaf is placed into ethanol, what should it be dipped in?

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  15. Finally, what should be added to the leaf to test for starch?

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  16. What is the positive test for starch?

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  17. What is the negative test for starch?

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  18. What colour is the iodine before testing positive for starch?

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