Question

A high acid flavor (sour) in milk is caused by ________

(a) Growth of bacteria in the milk

(b) Exposure of cows to acid rain

(c) Drinking hard water

(d) Absorption of acid from corn silage

I had been asked this question in a national level competition.

Origin of the question is Milk Quality Farm in division Quality parameters of Dairy Engineering

Answer 1

Correct answer is (a) Growth of bacteria in the milk

To elaborate: Micro organisms if present in milk leads to sour off flavor in milk. Bacteria are most responsible for sour off flavor in milk.