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.
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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 …
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…
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…
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 …
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, …
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 …
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…
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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