Question 13
Microorganisms act upon the dead plants to produce

(i) sand
(ii) mushrooms
(iii) humus
(iv) wood

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Solution

The answer is (iii) humus.

Humus is a dark-brown or black organic substance. It is formed by the decomposition of dead and decayed plant or animal matter by the microorganisms present in the soil. Humus provides nutrients for plants and increases the ability of soil to retain water.

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Micro-organisms act upon the dead plants to produce

(i) sand

(ii) mushrooms

(iii) humus

(iv) wood

Q. Microorganisms in a forest act upon dead plants to produce
(a) sand.
(b) mushrooms.
(c) humus.
(d) wood.

Q. Microorganism act upon a dead plant to produce

Question 4

Read the following statements with reference to soil.

(i) Weathering is a very fast process of soil formation,
(ii) Percolation of water is faster in sandy soils.
(iii) Loamy soil contains only sand and clay.
(iv) Topsoil contains the maximum amount of humus.

Choose the correct statements from the above
(a) (ii) and (iv)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (i) and (ii)

Q. Use the information given in column A to identify the organisms in column B.

\begin{matrix} Column A & Column B Prokaryote & (i) MBIIUOZHR Protist & (i i) MMPAAREIUC Chitinous cell wall & (i i i) OHSMRUOM Sporangium & (i v) NRFE \end{matrix}

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Question 13 Microorganisms act upon the dead plants to produce (i) sand (ii) mushrooms (iii) humus (iv) wood

The answer is (iii) humus. Humus is a dark-brown or black organic substance. It is formed by the decomposition of dead and decayed plant or animal matter by the microorganisms present in the soil. Humus provides nutrients for plants and increases the ability of soil to retain water.

Question 13
Microorganisms act upon the dead plants to produce

(i) sand
(ii) mushrooms
(iii) humus
(iv) wood

The answer is (iii) humus.

Humus is a dark-brown or black organic substance. It is formed by the decomposition of dead and decayed plant or animal matter by the microorganisms present in the soil. Humus provides nutrients for plants and increases the ability of soil to retain water.