MCQ
Fossil fuels are obtained from:
- ARemains of non-living materials
- BDead remains of birds only
- CDead remains of insects only
- ✓Dead remains of living organisms
Fossil fuels are obtained from the remains of living organisms (plants and animals) buried under the earth millions of years ago. Note: coal, petroleum and natural gas are fossil fuels.
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Manures
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Fertilisers
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$(i)$
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They are not soluble in water. So they are not easily absorbed by the roots of the plants.
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They are soluble in water and are absorbed by the plants easily.
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$(ii)$
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These are inorganic substances.
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These are organic substances.
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$(iii)$
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Excessive use does not harm the soil texture, they provide humus to the soil.
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Excessive use can change the chemical composition of the soil and also pollutes water.
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$(iv)$
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They restore the soil texture and help in water retention.
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They may damage the soil texture.
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$(v)$
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These are nutrient specific.
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These are not nutrient specific.
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Column $A$
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Column $B$
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$(I)$
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Laminaria
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$[A]$
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Protozoa
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$(II)$
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Paramecium
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$[B]$
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Bacteria
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$(III)$
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Penicillium
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$[C]$
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Algae
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$(IV)$
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Streptococcus
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$[D]$
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Fungi
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