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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.
Name some traditional Indian foods made of wheat, rice and Bengal gram (or their products) which involve use of microbes.
Which of the following is white button mushroom?
(A) Agaricus bisporus
(B) Pleurotus Florida
(C) Volvariella volvacea
(D) Candida species
Give the biological name of the following:
The microbe used to produce Swiss cheese.
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.
Which of the following pair is correctly matched for the product produced by them?
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?
Lactic acid is formed by the process of:
Milk is converted to curd by:
A small amount of curd added to the milk to initiate the curdling is called
Match the columns.
| Product | Microbe | ||
| A | Curd | 1 | Yeast |
| B | Bread | 2 | Propionibacterium |
| C | Swiss Cheese | 3 | LAB |
| D | Statins | 4 | Monascus purpureus |
The vitamin whose content increases following the conversion of milk into curd by lactic acid bacteria is ______.
What is the source organism for ECORI, restriction endonuclease?
Which species of Penicillium produces Roquefort cheese?
Name a microbe used for the production of Swiss cheese.
Which type of food would have lactic acid bacteria? Discuss their useful application.
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:
