ICSE Class X Biology 2013 Solved Papers

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The figure given below represents an experiment to demonstrate a particular aspect of photosynthesis. The alphabet ' A ' represents a certain condition inside the flask.
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Question : 30
Total: 90
In what manner do the leaves 1 and 2 differ at the end of the starch test?
Solution:  
Leaf 1 does not turned blue black while leaf 2 turned blue black at the end of starch test.
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