Q6 of 287 Page 344

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

Detritivores

Paedogenesis is decomposition by bacteria and fungi during which organic material is broken leading to humification and mineraliation. Earthworm is a detritivore that consumes organic matter and add excretory nitrogen to soil.


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4

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

 5

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

 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


 2

Match the contents of column I, II, and III.

Column I

Column II

Column III

((a) Mercuty

(b) Paedogenesis

(c) Abiotic

(d) Carbon dioxide

(e) Food

(i) Air & water

(ii) Water pollution

(iii) Resource

(iv)

Photosynthesis

(v) Sun, water & wind

I. Living

organism

II. Shell

(animals)

III. Energy

IV. Minamata

V. Soil