Question

Which of the following is used to test the presence of starch?
A. Cheek peel
B. Onion
C. Potato
D. None of the above

Answer 1

Hint: Starch is the organic substance that is produced by the plants it is granular and is white. A chemical test iodine is used to determine the presence of starch with the help of a potato.

Complete answer: Starch can be differentiated by other carbohydrates by using the iodine solution test. The chemical test for starch is done by adding the iodine solution and the change in colour to blue or black results in the presence of starch. The simple iodine tests can be done with the potato by cutting it in small pieces and then adding the iodine solution and leaving it undisturbed for some minutes and its colour of the potato will change into black-blue which shows the presence of starch. The iodine which is the liquid that is used for the test is used to detect the presence of carbohydrates and thus the presence of the starch. Starch is produced within the green leaves of plants, they act as reserve food materials in the plants. Food such as corn, wheat, rice, potatoes, etc. contains starch. In humans, starch is broken down into sugar molecules and supplies energy.
Hence, the correct answer is option C.

Note: In plant tissue it diffuses from one cell to another and nourishes it. The disintegration of the starch is done by the help of various enzymes and water which converts the starch into the monomer glucose units.