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Chapter 8 of 18
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Useful and Harmful Microbes

Maharashtra Board · Class 9 · Science

Flashcards for Useful and Harmful Microbes — Maharashtra Board Class 9 Science. Quick Q&A cards covering key concepts, definitions, and formulas.

45 questions22 flashcards5 concepts

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22 Flashcards
Card 1Introduction to Microbes

What are microbes? State their main characteristics.

Answer

Microbes are microscopic organisms that cannot be seen with naked eyes. Their main characteristics are: 1) They are very small in size, 2) They are present everywhere around us, 3) They can be useful

Card 2Useful Microorganisms - Lactobacilli

What are Lactobacilli? Describe their shape and nature.

Answer

Lactobacilli are beneficial bacteria that are rod-shaped and rectangular. They are anaerobic bacteria, meaning they can produce energy without oxygen. They appear blue when stained with methylene blue

Card 3Useful Microorganisms - Lactobacilli

Explain the process of fermentation by lactobacilli in milk.

Answer

Lactobacilli convert lactose (milk sugar) into lactic acid through fermentation. This process decreases the pH of milk, causing coagulation of milk proteins. The proteins separate from other milk cons

Card 4Useful Microorganisms - Lactobacilli

List five important uses of Lactobacilli.

Answer

1) Production of milk products like yogurt, buttermilk, cheese, shrikhand, 2) Large-scale production of pickles, cider, and cocoa, 3) Treatment of abdominal discomfort when combined with other useful

Card 5Useful Microorganisms - Lactobacilli

What are probiotic foods? How do they benefit our health?

Answer

Probiotic foods are products containing useful microbes like lactobacilli. They benefit our health by: 1) Killing harmful bacteria like Clostridium in the alimentary canal, 2) Improving our immunity,

Card 6Useful Microorganisms - Rhizobium

What is Rhizobium? Where is it found and what type of relationship does it form?

Answer

Rhizobium is a symbiotic bacteria found in root nodules of leguminous plants. It forms a mutually beneficial relationship called symbiosis with these plants. The bacteria appear as pinkish rod-shaped

Card 7Useful Microorganisms - Rhizobium

Explain the symbiotic relationship between Rhizobium and leguminous plants.

Answer

In this symbiotic relationship: Rhizobium provides nitrates, nitrites, and amino acids to the plant from atmospheric nitrogen fixation. In exchange, the plant provides carbohydrates (energy) to the ba

Card 8Useful Microorganisms - Rhizobium

What is rhizobial inoculation and what are its benefits?

Answer

Rhizobial inoculation is the process of coating seeds with rhizobial solution or powder before sowing. Benefits include: 1) Reducing use of chemical fertilizers, 2) Decreasing expenses on fertilizers,

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What are the important topics in Useful and Harmful Microbes for Maharashtra Board Class 9 Science?
Useful and Harmful Microbes covers several key topics that are frequently asked in Maharashtra Board Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
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