The reagent used to test the presence of starch in leaves is

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Q: 59 (SSC/NA)
The reagent used to test the presence of starch in leaves is

question_subject: 

Science

question_exam: 

SSC

stats: 

0,4,2,1,4,0,1

keywords: 

{'starch': [1, 0, 0, 0], 'reagent': [1, 0, 0, 0], 'iodine solution': [1, 0, 0, 0], 'leaves': [0, 0, 1, 3], 'solution': [2, 0, 7, 14]}

The correct answer is option 2, Iodine solution. Iodine solution is commonly used to test for the presence of starch in leaves. When iodine solution is added to a leaf, it reacts with any starch present in the leaf and forms a blue-black color. This is due to the formation of a compound between the iodine and the starch molecules, which results in this distinct color change.

Option 1, Fehling`s solution, is used to test for the presence of reducing sugars, not starch. Option 3, Million`s reagent, is used to test for the presence of proteins. Option 4, Benedict`s solution, is also used to test for the presence of reducing sugars, not starch.

Therefore, option 2 is the correct answer as iodine solution is specifically used to test for the presence of starch in leaves.