HEATED CANNED FOODS QUIZ

Flat sour spoilage of acid foods is caused by

B. pepo

B. stearothermophillus

B. coagulans

both (a) and (b)

TRUE ANSWER : ?
YOUR ANSWER : ?

The most important kind of chemical spoilage of canned foods is the hydrogen swell which is favored by

imperfection in the tinning and lacquering

increasing temperature of storage

increasing acidities of foods

all of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following species can cause bitterness, acidity and curdling in canned milk, cream and evaporated milk?

Saccharomyces

Bacillus

Clostridium

both (a) and (b)

TRUE ANSWER : ?
YOUR ANSWER : ?

The presence of viable non-spore forming bacteria in heat process canned foods indicates leakage of the container. Which of the following is responsible for the spoilage of leaky cans?

Plant equipment

High sugar content

Cooling water

Highly acidic medium

TRUE ANSWER : ?
YOUR ANSWER : ?

High acid foods with a pH < 3.7 undergo spoilage by

B. coagulans

Saccharolytic anaerobe

both (a) and (b)

do not undergo spoilage by microorganisms

TRUE ANSWER : ?
YOUR ANSWER : ?

Canned meat and fish exhibit spoilage by

Saccharomyces

Clostridium species

Bacillus species

both (a) and (b)

TRUE ANSWER : ?
YOUR ANSWER : ?

Acid foods with a pH between 4.5 and 3.7 usually are spoiled by

none of these

both (a) and (b)

B. coagulans

Saccharolytic anaerobe

TRUE ANSWER : ?
YOUR ANSWER : ?

The canned acid foods such as pineapple, tomatoes and pears have been found spoiled by C. pasteurianum. Such spoilage is more likely when the pH of the food is

>5.3

>4.5

<4.5

<5.3

TRUE ANSWER : ?
YOUR ANSWER : ?

The putrifactive anaerobes grow best in the

any of these

medium acid canned foods

low acid canned foods

high acid canned foods

TRUE ANSWER : ?
YOUR ANSWER : ?

The butyric acid type of fermentation in acid or medium acid foods, with swelling of the container by the carbon dioxide and hydrogen gas is caused by

both (a) and (b)

C. sporogenes

C. pasteurianum

C. butyricum

TRUE ANSWER : ?
YOUR ANSWER : ?

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