Starch is produced as a result of photosynthesis in a plant - Junior Cycle Science - Question c - 2015
Question c
Starch is produced as a result of photosynthesis in a plant.
The diagram shows one of the steps involved in testing a leaf for the presence of starch.
The purpose of... show full transcript
Worked Solution & Example Answer:Starch is produced as a result of photosynthesis in a plant - Junior Cycle Science - Question c - 2015
Step 1
Why is it necessary to remove the chlorophyll from the leaf?
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Answer
It is necessary to remove chlorophyll from the leaf so as to see the color change. Chlorophyll can mask the presence of starch, making it difficult to observe any color change from the starch test.
Step 2
Name liquid X.
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Liquid X is alcohol.
Step 3
Give a detailed description of the next steps that the student would take when testing the leaf for the presence of starch.
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Answer
Remove the leaf from liquid X (alcohol).
Dip the leaf in boiling water or place it in a water bath to soften it.
Add iodine solution to the leaf.
Place the treated leaf on a white surface (such as a tile or clock glass).
Observe the color change which will indicate the presence of starch: if starch is present, the iodine will turn blue, black, or purple.
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