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प्रश्न
Which type of food would have lactic acid bacteria? Discuss their useful application.
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उत्तर
The most common food item is curd, and yoghurt contains Lactic Acid Bacteria (LAB) of Lactobacillus species. Curd is formed by adding a small amount of curd to the milk, which acts as a starter. Microbes present in the starter multiply at suitable temperatures and convert milk into curd. Acids released by LAB during the growth coagulate and partially digest milk protein, casein thus increases the digestibility of milk protein.
Application of LAB
- Improves the nutritional quality of milk by increasing vitamin B12.
- Checks disease-causing microbes in the stomach.
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संबंधित प्रश्न
Give examples to prove that microbes release gases during metabolism.
In which food would you find lactic acid bacteria? Mention some of their useful applications.
Find out the role of microbes in the following:
Single cell protein (SCP)
Give the biological name of the following:
The microbe used to produce Swiss cheese.
Give the biological name of the following:
A symbiotic nitrogen-fixing bacterium found in root nodules.
Answer the following question:
Name the group of bacteria involved in setting milk into curd. Explain the process they carry in doing so. Write another beneficial role of such bacteria.
Name the microbes that help the production of the following product commercially:
Citric acid
Which of the following microorganism is used for production of citric acid in industries?
Which of the following pair is correctly matched for the product produced by them?
List the advantages of biogas plants in rural areas.
Concentrations of which vitamin increases, while the milk is converted into curd by the process of fermentation:
Lactic acid is formed by the process of:
Match the columns.
| Product | Microbe | ||
| A | Curd | 1 | Yeast |
| B | Bread | 2 | Propionibacterium |
| C | Swiss Cheese | 3 | LAB |
| D | Statins | 4 | Monascus purpureus |
Big holes in Swiss cheese are made by ______.
Why does ‘Swiss cheese’ have big holes?
What is the source organism for ECORI, restriction endonuclease?
Home-made fruit juices are turbid, while the bottled ,fruit juices purchased from the market are clear. Give a reason for this difference.
Read the passage given below carefully and answer the questions that follow:
|
The bacterium Bacillus thuringiensis serovar israelensis (Bti) is commercially prepared in various formulations such as liquid, water dispersible granules, powders, and pellets. It is used as a larvicide all over the world due to its ability to produce a toxic protein that primarily targets the larvae of mosquitoes. In Sweden, Bti has been applied on a large scale in the form of commercially available granular formulation Vecto Bac G (Valent BioScience, USA). The applications have taken place in the lower Dalalven River Area to control mass outbreaks of the floodplain mosquito Aedes sticticus. |
- Why does the toxic protein kill the insects but not the bacterium?
- Can the formulation Vecto Bac G be used to eliminate the species of mosquito referred to above? Why?
