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प्रश्न
Among the given options, which one is not correct for the use of large amounts of fertilisers and pesticides?
पर्याय
They are eco-friendly
They turn the fields barren after some time
They adversely affect the useful component from the soil
They destroy the soil fertility
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उत्तर
They are eco-friendly
Explanation:
Fertilisers and pesticides are not eco¬friendly, in fact, they are considered as a source of air, water and soil pollution. Excessive use of fertilisers can turn the soil acidic or alkaline and affects the fertility of the soil. Prolonged use of fertilisers can destroy soil fertility by killing the microorganisms that form humus. The soil may become unable to sustain plant life and ultimately become barren.
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संबंधित प्रश्न
State the importance of water cycle in nature.
Match the statements in column A with that in column B.
| Column A | Column B |
| (a) deliquescent substance | (1) sodium bicarbonate |
| (b) hygroscopic substance | (2) magnesium chloride |
| (c) efflorestance substance | (3) conc. sulphuric acid |
| (d) substance causing temporary hardness | (4) washing soda |
State the importance of the solubility of CO2 and O2 in water.
Explain why rivers and lakes do not freeze easily.
Select the correct answer of the following statement:
A drying agent placed in desiccator.
Give a balanced equation for the following conversion:
Magnesium bicarbonate in temporary hard water to magnesium carbonate by boiling.
Give a reason for the following:
A crusty ‘boiler scale’ is formed in boilers, when hard water is used.
Name or state the following:
A deliquescent salt of a trivalent metal.
________ of water is in oceans and seas.
Write a few slogans of your own on the topic “Save Water”
