आयोडीन के घोल की कुछ बूंदों के साथ किसी पदार्थ का रंग नीला-काला हो जाना उस पदार्थ में ______ की उपस्थिति को दर्शाता है।

Match the Nutrients in Column I with their corresponding Deficiency Disorders in Column II: Column I (A) Iron (B) Vitamin B1 (C) Vitamin C (D) Iodine Column II (I) Beriberi (II) Scurvy (III) Goitre (IV) Anaemia

Given below are the steps to test the presence of proteins in a food item. These steps are not in the correct sequence: (A) Take a small quantity of food item in a test tube, add 10 drops of water to it and shake it. (B) Make a paste or powder of the food to be tested. (C) Add 10 drops of caustic soda solution to the test tube and shake well. (D) Add 2 drops of copper sulphate solution to it. The correct sequence of these steps is: