If we test this nutrient for starch and glucose does it becomes positive

1. For starch: To test for starch, you typically use iodine solution. If starch is present, the solution will turn from yellowish-brown to a blue-black color, indicating a positive result.
2. For glucose: To test for glucose (a reducing sugar), you typically use Benedict's solution and heat the sample. If glucose is present, the solution will change color from blue through green, yellow, orange, to a brick-red precipitate, indicating a positive result.

Therefore, the tests will only be positive if the nutrient you are testing contains starch or glucose, respectively.