25. NCERT Exemplar VII

3 m.

1. Choose the correct sequences.

$CO_2$ in atmosphere → decomposers → organic carbon in animals → organic carbon in plants
$CO_2$ in atmosphere → organic carbon in plants → organic carbon in animals → inorganic carbon in soil
Inorganic carbonates in water → organic carbon in plants → organic carbon in animals → scavengers
Organic carbon in animals → decomposers → $CO_2$ in atmosphere→ organic carbon in plants

2. Major source of mineral in soil is the

3. Total earth’s surface covered by water is

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