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Horizon

The darkest l...

Question

The darkest layer of soil is:

A

Top soil

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B

Bedrock

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C

B - horizon

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D

C - horizon

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Solution

The correct option is A Top soil
Dead plants and animals are degraded in soil by decomposing bacteria and fungi. The material formed after this decomposition activity is called humus. Humus is very rich in nutrients and is black in color. Topsoil is the darkest as it is rich in humus.

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Similar questions

Why top soil is dark in color in comparison to other horizons?

Q.  With respect to soil profile consider the following statements:

1.Horizon A is the top most layer and is mostly made up of decayed organic matter.
2.Horizon B is the Zone of transition between Horizon A and Horizon C.
3.Horizon C is composed of loose parent material and demarcates the final stage in soil formation.

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What is horizon? Name the three horizons of the soil. [3 MARKS]

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Q. Given figure represents the organic soil profiile, showing different layers/horizons of soil.
Which of the folllowing statements regarding the soil profile are not true?
(i)maximum roots oof plants are found n horiizon A.
(ii) Maximum nutrients are present in horizon B.
(iii) Horizon B contains party weathered rocks
(iv) Horizon C contains roots of the pllants and mineral salts.

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