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प्रश्न
Comment on the following:
Denitrifying bacteria are a blessing as well as a curse to farmers.
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उत्तर
Denitrifying bacteria are a boon to farmers because they curb the excess supply of nitrates to plants. Excessive nitrates can even harm the ecosystem as a whole because some wild plants like cultivated crops can thrive on nitrogen. The growth of these plants is favored in nitrogen-saturated environments which can upset the ecosystem. Denitrifying bacteria are a curse to farmers because they breakdown soil nitrates to release free nitrogen gas into the atmosphere, thereby reducing the levels of nitrogenous compounds in the soil.
संबंधित प्रश्न
Name any one variety of edible mushrooms.
Tick (✓) mark the correct statement/statements.
(a) All mushrooms are poisonous.
(b) All toadstools are poisonous.
(c) Some toadstools are poisonous.
(d) Some mushrooms are edible.
If you leave a piece of moist bread covered under a small bell jar at a warm place, mould grows on it in a few days. Answer the following with reference to this observation:
How did the mould get inside the bell-jar?
If you leave a piece of moist bread covered under a small bell jar at a warm place, mould grows on it in a few days. Answer the following with reference to this observation:
What would happen if the bread was not covered by the bell-jar?
If you leave a piece of moist bread covered under a small bell jar at a warm place, mould grows on it in a few days. Answer the following with reference to this observation:
What would happen if moist bread was placed in a refrigerator?
Explain briefly:
Yeast is used in bakeries and breweries.
Give the name of the
mould that causes lung mycosis.
How are fungi important as food?
Name two plant diseases caused by fungi. Also, mention the causal agents.
Read the following statements and select the correct option.
Statement I: Nostoc is a chemosynthetic autotroph.
Statement II: Nostoc can fix atmospheric nitrogen in heterocysts.
