MCQ
Which of the following are prokaryotes?
- AProtozoa and blue-green algae.
- BBlue-green algae and fungi.
- CProtozoa and bacteria.
- ✓Blue-green algae and bacteria.
Organisms which do not have true nucleus are called prokaryotes. Bacteria and blue green algae are examples of prokaryotes.
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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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