Question

Micro-organisms act upon the dead plants to produce
(i) sand (ii) mushrooms (iii) humus (iv) wood

Answer 1

Micro-organisms act upon the dead plants to produce iii) humus. Various microorganisms like algae, amoeba, etc break down various dead plants and animals , and produce many things including humus.

It is a way of nature to break down substances so that they dont pollute the land. The humus or other substances which they produce can be used later for various things.

Answer 2

Answer:

Micro-organisms act upon the dead plants to produce.

(i) Sand

(ii) Mushrooms

(iii) Humus

(iv) Wood

Answer: (iii) Humus