A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains (a) complex proteins (b) simple proteins (c) fats starch

Answer is (d) starch

Explanation

Starch is made up of two components Amylose and Amylo pectin. When we add iodine to starch containg waqter Amylose reacts with iodine to form a blue colour complex. Here solution gives blue-black colour on adding Iodine which confirms the presence of starch in the rice water.