Chapter 9: Forests: Our Lifeline

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Forests: Our Lifeline


Micro-organisms act upon the dead plants to produce:

(i) sand

(ii) mushrooms

(iii) humus

(iv) wood


The dark-coloured substance formed by the action of micro-organisms on dead plants and animal tissues is called humus. Humus is rich in nutrients. Humus mix with the soil in the forest and the nutrients present in it are used for the growth of plants. 

Hence, the correct answer is (iii) humus.

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