An iodine test was performed using a variegated leaf of money plant. Some parts of the leaf showed positive result. Which colour was shown by these parts?
(a) Grey-black
(b) Blue- brown
(c) Blue-black
(d) Brown- black
The correct answer is (c) Blue - Black because we know that if iodine solution is put on a substance then, it will change into blue - black and leaves contain starch.