Q5 of 287 Page 344

..............makes soil porous and allows water and air to peneterate deep underground.

humus

Humus is organic due to large content of organic carbon. It retains moisture in the soil and loosens the soil thus allowing water and air to penetrate deep underground thus increasing the soil organisms which provide nutrients to the plant.


More from this chapter

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3

Surface temperature of moon varies from – 190° to ..............

 4

CFCs are carbon compounds having both ............... and chlorine.

 6

Earthworms are .................which are involved in paedogenesis.

 1

Match the contents of the column I and column II.











Column I



Column II



(a) Carbon dioxide


(b) Nitrogen fixation


(c) CFCs (chloroflurocarbons)


(d) Decomposers


(e) Oxides of nitrogen and


Sulphur



(a)Bacteria


(b) ODS (ozone depletion


Substances)


(iii) GHG (green house gas)


(iv) Fossil fuels


(v) Mineralization