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प्रश्न
Bacteria cannot be seen with the naked eyes, but these can be seen with the help of a microscope. If you have to carry a sample from your home to your biology laboratory to demonstrate the presence of microbes with the help of a microscope, which sample would you carry and why?
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उत्तर
If you have to carry a sample from your home to the biology laboratory to demonstrate the presence of microbes under a microscope, the best sample to carry would be curd.
- Curd contains lactic acid bacteria (LAB), such as Lactobacillus, which are abundant and easy to observe under a microscope.
- It is safe to handle.
- The microbes in curd are actively involved in fermentation and are easy to culture or view under a microscope due to their high population.
- Curd microbes are economically useful and familiar examples of bacterial activity.
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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.
Name some traditional Indian foods made of wheat, rice and Bengal gram (or their products) which involve use of microbes.
Answer the following question:
Why does 'Swiss Cheese' develop large holes?
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?
How is milk converted into curd? Explain the process of curd formation.
Write short notes on the following:
Brewer's yeast
List the advantages of biogas plants in rural areas.
Which of the following pair is correctly matched for the product produced by them?
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:
Why does ‘Swiss cheese’ have big holes?
What is the source organism for ECORI, restriction endonuclease?
Name a microbe used for the production of Swiss cheese.
Which type of food would have lactic acid bacteria? Discuss their useful application.
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?
Which of the following microbes is NOT involved in the preparation of household products?
- Aspergillus niger
- Lactobacillus
- Trichoderma polysporum
- Saccharomyces cerevisiae
- Propionibacterium sharmanii
Choose the correct answer from the options given below:
