The organic matter in humus is made of
a.
dead worms
c.
roots
b.
stems
d.
all of the above

The correct answer is option (d).

Explanation:

Humus is component of the soil formed from the decomposition of dead plants (leaves, flower, roots. stems etc)and animal matter by the action of micro-organism. This makes the soil nutrient rich and fertile for plants.

Hence, the correct answer is (d).

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