NEET BIOLOGY

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BIOLOGICAL CLASSIFICATION

KINGDOM MONERA

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Pay attention to the following methods of sterilization (1) heating in the oven at 170-180 o C for 2 hours (2) heating in the boiler at 100 o C for 1 hour 3 times (3) heating in the autoclave for 15 minutes (4) Pasteurization (5) Ozonization Sterilization of milk and ordinary mineral water can be carried out by means of ____
A
1 and 3
B
1 and 5
C
2 and 3
D
3 and 4
E
4 and 5
Explanation: 

Detailed explanation-1: -Hot air ovens use extremely high temperatures over several hours to destroy microorganisms and bacterial spores. The ovens use conduction to sterilize items by heating the outside surfaces of the item, which then absorbs the heat and moves it towards the center of the item.

Detailed explanation-2: -Types of moist heat sterilization include autoclaving, pasteurization, boiling, and tyndallization (intermittent sterilization). Autoclaving is the most effective method of moist heat sterilization since it destroys micro-organisms and their spores. It also utilizes equipment called an autoclave.

Detailed explanation-3: -In sterilisation, moist heat can be used: (c) At a temperature above 100°C (in saturated steam under increased pressure) which ensures the complete sterilisation and killing of the most highly resistant spores.

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