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Production of Food and its Management — BIOLOGY STD 8 — Question

ICSE BoardEnglish MediumSTD 8BIOLOGYProduction of Food and its Management3 Marks
Question
How are manures different from fertilizers ?
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Answer

manures :
A natural substance obtained by the decomposition of plants and animals.
Prepared in fields
Provides a lot of humus to the soil
Less rich in nutrients. šo required in large quantities.
Nõ pollution is caused.
Fertilizers :
These are chemical fertilizers.
Prepared in factories.
Does not contain any humus.
Rich in specific nutrients, šo required in very small quantities.
Causes water pollution.

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