Question 18
Top-soil contains the following

(a) Humus and living organisms only
(b) Humus and soil particles only
(c) Humus, living organisms and plants
(d) Humus, living organisms and soil particles.

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Solution

(d) Humus, living organisms, and soil particles.

The topmost layer of the soil that contains humus and living organisms in addition to the soil particles. Topsoil is a thin layer and contains soil's nutrients.

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Similar questions

Match the items in Column I with those in Column II:

	Column I		Column II
(i)	A home for living organisms	(a)	Large particles
(ii)	Upper layer of the soil	(b)	All kinds of soil
(iii)	Sandy soil	(c)	Dark in colour
(iv)	Middle layer of the soil	(d)	Small particles and packed tight
(v)	Clayey soil	(e)	Lesser amount of humus

Quality of soil is decided by the amount of humus and microscopic organisms present in it.

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