Question

the tubes below show the result of an iodine test. which statement is true?
a
b
tube b has glucose
tube a has starch
tube b has starch
tube a has glucose

Explanation:

Iodine test is used to detect starch. When iodine reacts with starch, it turns blue - black. Tube B shows a blue - black color, indicating the presence of starch. Glucose is not detected by the iodine test. Tube A does not show the blue - black color, so it does not have starch.

Answer:

Tube B has starch.