BIOLOGY
CLASSIFICATION OF CARBOHYDRATES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
presence of starch
|
|
|
absence of starch
|
|
|
presence of reducing sugar
|
|
|
absence of non-reducing sugar
|
Detailed explanation-1: -In unripe bananas, staining with Lugol’s iodine solution turns the starch and amyloplasts a deep purple colour (figure 3).
Detailed explanation-2: -Using an iodine solution, you can test for the presence of starch. When starch is present, the iodine changes from brown to blue-black or purple.
Detailed explanation-3: -Result and Interpretation of Iodine Test The appearance of blue-black or purple color represents a positive test, indicating the presence of starch. If there is no change in color, the result is negative and indicates the absence of starch.
Detailed explanation-4: -Result and Interpretation of Iodine Test Based on the observation in the color change of the samples, the following may be concluded as the iodine test for starch results: The appearance of blue-black color indicates the presence of the starch in the sample, i.e., a positive iodine test (Figure 3).