WB TET · Mathematics and Science (Paper II)
Bacteria, viruses, fungi — useful and harmful.
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Q1 · Microorganisms · EASY
Yeast is used in baking bread because it releases a gas during fermentation that makes the dough rise. Which gas is released by yeast during this process?
Q2 · Microorganisms · MEDIUM
A doctor prescribes antibiotics to a patient suffering from a throat infection caused by bacteria. Why are antibiotics NOT effective against viral infections like the common cold?
Q3 · Microorganisms · MEDIUM
Lactobacillus bacteria are added to warm milk to prepare curd (dahi). During this process, what change does Lactobacillus bring about in milk that converts it into curd?
Q4 · Microorganisms · HARD
A student observes that food kept in a refrigerator stays fresh longer than food kept outside. She learns that low temperature slows down the growth of microorganisms. If a certain type of bacteria doubles its population every 30 minutes at room temperature (30°C), but doubles every 3 hours at refrigerator temperature (4°C), how many times more bacteria will be present after 6 hours at room temperature compared to refrigerator temperature, starting with the same initial number?
Q5 · Microorganisms · EASY
Which of the following microorganisms is commonly used in the production of curd from milk?