ANSWER IN BRIEF
1. What do you mean by food preservation? Why we have to
preserve food?
2. What do you mean by Pasteurisation?
3. What you mean by Nitrogen fixation? State two ways in
which Nitrogen can be fixed in nature.
4. Make a flow chart to explain the food preservation
techniques
5. Draw a neat labelled Diagram of nitrogen cycle
Answers
Explanation:
1.Food preservation prevents the growth of microorganisms (such as yeasts), or other microorganisms (although some methods work by introducing benign bacteria or fungi to the food), as well as slowing the oxidation of fats that cause rancidity.i
2.Pasteurization is a process in which water and certain packaged and non-packaged foods (such as milk and fruit juice) are treated with mild heat, usually to less than 100 °C (212 °F), to eliminate pathogens and extend shelf life. Spoilage enzymes are also inactivated during pasteurization.
3. Nitrogen fixation is the process by which nitrogen is taken from its stable gas form (N2) in air and changes into other nitrogen compounds (such as ammonia, nitrate and nitrogen dioxide) useful for other chemical processes. It is an important part of the nitrogen cycle.
ways of fixing nitrogen in nature are:
first, by lightning; finally, by bacteria living in the soil.
Answer: 1. Food preservation is a method of preserving food. It prevents the growth of microorganisms and slows oxidation of fats that cause rancidity. Why we preserve food? Well, we know that food is one of the most essential things we need in life. Food can spoil easily if we don't preserve it in the right way. So, food preservation is very important.
2. Food pasteurization is a process in which we heat liquids or food to kill pathogenic bacteria.
3. Nitrogen fixation is a process where nitrogen is taken from its stable gas form in air and turns into other nitrogen compounds. Examples include nitrogen fixing symbioses in root nodules of legumes, nodules of Rhizobium(part of a clover root system).
Explanation:
Hope this helps.