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 is called the topsoil.

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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.

Q. Identify the layer in the soil profile that is rich in humus and also act as a shelter to various living organisms.

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

Q. Assertion :Humus makes the soil fertile. Reason: Humus is rich in organic matter.

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

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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.

(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 is called the topsoil.

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.

(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 is called the topsoil.