Question
Question: Cut surfaces of fruit and vegetables often become dark because...
Cut surfaces of fruit and vegetables often become dark because
A
Dirty knife makes it dark
B
Oxidation of tannic acid in the presence of trace of iron from the knife makes it dark
C
Dust of the air makes it dark
D
None of the above
Answer
Oxidation of tannic acid in the presence of trace of iron from the knife makes it dark