Class 8ScienceMicroorganisms: Friend and Foe
Food Preservation
Microorganisms spoil food by growing in it. Methods to preserve: 1) Salt โ draws out water (dehydrates microbes). 2) Sugar โ in jams and jellies. 3) Oil and vinegar โ prevent oxygen. 4) Pasteurization โ heat to 70ยฐC for 15s (Louis Pasteur). 5) Refrigeration โ slows microbial growth. 6) Preservatives โ sodium benzoate.
10 examples
Concept check 1
For Class 8 Science, explain or solve a food preservation question from the chapter "Microorganisms: Friend and Foe". Focus on concept check and show the working clearly.
Definition to application 2
For Class 8 Science, explain or solve a food preservation question from the chapter "Microorganisms: Friend and Foe". Focus on definition to application and show the working clearly.
Formula warm-up 3
For Class 8 Science, explain or solve a food preservation question from the chapter "Microorganisms: Friend and Foe". Focus on formula warm-up and show the working clearly.
Reasoning practice 4
For Class 8 Science, explain or solve a food preservation question from the chapter "Microorganisms: Friend and Foe". Focus on reasoning practice and show the working clearly.
Board-style short answer 5
For Class 8 Science, explain or solve a food preservation question from the chapter "Microorganisms: Friend and Foe". Focus on board-style short answer and show the working clearly.
Mistake correction 6
For Class 8 Science, explain or solve a food preservation question from the chapter "Microorganisms: Friend and Foe". Focus on mistake correction and show the working clearly.
Visual interpretation 7
For Class 8 Science, explain or solve a food preservation question from the chapter "Microorganisms: Friend and Foe". Focus on visual interpretation and show the working clearly.
Applied word problem 8
For Class 8 Science, explain or solve a food preservation question from the chapter "Microorganisms: Friend and Foe". Focus on applied word problem and show the working clearly.
Revision challenge 9
For Class 8 Science, explain or solve a food preservation question from the chapter "Microorganisms: Friend and Foe". Focus on revision challenge and show the working clearly.
Exam recap 10
For Class 8 Science, explain or solve a food preservation question from the chapter "Microorganisms: Friend and Foe". Focus on exam recap and show the working clearly.