Economic Importance of Bacteria and Fungi
ICSE · Class 9 · Biology
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Which of the following is the shape of bacilli bacteria?
Penicillin, the first antibiotic, was discovered from which organism?
Which bacteria is responsible for nitrogen fixation in leguminous plants?
Pasteurization is used to preserve which food item?
Sample Questions
Which of the following are useful roles of bacteria in medicine? (Select all correct answers)
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Production of antibiotics, Preparation of vaccines, Making serums
Bacteria are useful in medicine for producing antibiotics (like streptomycin), preparing vaccines (killed or weakened bacteria), and making serums containing antitoxins. Causing diseases and food spoilage are harmful roles.
Yeast is used in bread making because it produces:
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Carbon dioxide gas
Yeast ferments sugar in the dough and produces carbon dioxide gas, which makes the dough rise and gives bread its spongy texture.
Which of the following methods can preserve food by preventing bacterial growth? (Select all correct answers)
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Refrigeration, Salting, Dehydration
Cold temperatures (refrigeration), salt, and removal of water (dehydration) all prevent bacterial growth. Adding water would actually help bacteria grow.
The most common edible mushroom cultivated worldwide is:
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Agaricus bisporus
Agaricus bisporus, also known as white button mushroom, is the most common edible mushroom cultivated and eaten worldwide.
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