How much time is required by spores of Clostridium botulinum to be killed by moist heat at 1200C?

The x-axis shows the temperature and the y-axis shows the killing time. This is with respect to spores in a suspension. Curve a = 100,000 spores/ml and b= 1,000 spores/ml. Above curve a is the region of spores killed and below the region b is the region of spores survived. Which of the following do we comprehend from the above?

A

Greater the spore concentration, more heat resistant the suspension

B

Spores of a given strain, all have the same heat resistance

C

Spores of the same strain have many spores of low heat resistance

D

Spores of the same strain have very few spores of high heat resistance

Which of the following is true about clostridium botulinum?

A

It is at a pH of 4.5

B

Foods containing this require good heat treatment

C

One millionth of a gram of toxin produced also will kill man

D

All of the mentioned

For Clostridium botulinum type A toxin, 1 MLD for a mouse is ____________

A

2.5 X 10-5 µg

B

4 X 10-5 µg

C

6 X 10-2 µg

D

5 µg

Where is Clostridium botulinum most commonly found?

A

Improperly processed canned food

B

Improperly processed frozen food

C

Improperly processed boiled food

D

Improperly processed dried food

Which of the following microorganisms are responsible for causing food poisoning?
1. Clostridium botulinum
2. Trichinella spiralis
3. Ascaris lumbricoides
4. Staphylococus aureus
Select the correct answer

A

1 and 2

B

2 and 4

C

1 and 4

D

3 and 4

For Clostridium botulinum the z value is

A

10

B

45

C

90

D

100

The F value for Clostridium botulinum is

A

8D

B

10D

C

12D

D

5D

Which of the following is not true about Clostridium Botulinum?

A

Improperly canned food is contaminated by this bacteria

B

Honey is contaminated by this bacteria

C

This bacteria attacks children who do not have a normal immune system

D

Low acid vegetables are affected by this bacteria

Which of the following microorganisms cause food borne intoxication?
1. Staphylococcus aureus
2. E coli
3. Clostridium botulinum
4. Listeria monocytogenes
5. Salmonella
Select the correct answer

A

1 and 2

B

1 and 3

C

3 and 4

D

4 and 5

Statement 1: Spores heated in soil directly are more heat resistant than ones which are mixed with sterile soils and then heated. Statement 2: Thermophilic bacteria which form spores in artificial media are more heat resistant than those formed on machinery in canning plants.

A

True, False

B

True, True

C

False, False

D

False, True

How much time is required by spores of Clostridium botulinum to be killed by moist heat at 1200C?

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