Q. Which of the following is true about lethal mutation?

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Q. Which of the following methods is possible to kill bacteria?

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Q. Which of the following is true about death time curve method to sterilize canned food?

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Q. Statement 1: Heat resistance of an organism is designated by the ‘c’ value.
Statement 2: The ‘z’ value stands for the number of degrees centigrade required for the thermal death time curve to traverse one logarithmic cycle.

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Q. There is an existing relationship between the heat resistance of a vegetative cell and that of the spore formed thereafter.

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Q. Between the following factors, which of the following have maximum effect on highly heat resistant spores?

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Q. Statement 1: The physical environment in which a spore is grown has minimal affect on its heat resistance.
Statement 2: Freezing weakens spores.

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Q. 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.

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Q. Artificial media weakens cultures of organisms.

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Q. For a culture to be kept alive for a long time, the medium permitting limited growth is favourable than one which has enriched conditions.

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Q. Which of the following falls in the low acidic group?

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Q. Which of the following is true about clostridium botulinum?

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Q. Which of the following is true about corn?

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Q. Which of the following organisms have a high resisting effect at high temperatures?

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Q. Which of the following is true about clostridrium botulinum?

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Q. Which of the following spore forming bacteria may lead to overcooked and degraded canned food?

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Q. Thermophilic flat sour spoilage is due to _____

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Q. Statement 1: Thermophilic flat sour spoilage generally doesn’t take place at home.
Statement 2: Thermophilic flat sour spoilage has one difficulty that there is only formation of acids and no gas leaks.

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Q. Niti and Reeti go shopping. Niti picks up a pickle bottle which is slightly bulged. Reeti immediately asks her to keep it back saying that he bulging means it is spoiled. What could be the reason for the bulging?

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Q. Niti brings home two packets. One is a pickle bottle and the other a tomato soup packet. After opening the packet, reading the expiry date and smelling them she realizes that they’re both spoiled. Which of these two would she anyway haven’t known (other than the expiry date) to be spoiled without opening?

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