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Soil Profile

Which of the ...

Question

Which of the following situations - 'A' or 'B' - is advantageous for absorption of water and minerals? Why?

Situation 'A': Growth and branching of roots in the C-horizon.

Situation 'B': Growth and branching of roots in A and B horizons.

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Solution

Situation ‘B’ is advantageous over situation ‘A’. Since in situation B, growth and branching of the roots takes place in A and B horizon

A and B horizon

C horizon

A soil is porous. Thus, its water absorbing capacity is better

C-horizon is made up of broken bedrocks thus the soil is non-porous

A and B horizons are rich in nutrients, organic matter, and humus.

It does not contain any organic matter for plant growth

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Question 9

Which of the following situations – ‘A’ or ‘B’ – is advantageous for absorption of water and minerals? Why?
Situation ‘A’ : Growth and branching of roots in the C-horizon.
Situation ‘B’ : Growth and branching of roots in A and B horizons.

Availability of water and minerals in the soil for maximum absorption by roots is in the –

(a) B-horizon
(b) C-horizon
(c) A-horizon
(d) surface of soil

Match the following and choose the correct option:

i. A - horizon a. Small lumps of rocks

ii. B - horizon b. Hard layer which is difficult to dig

iii. C - horizon c. Dark in colour and rich in humus

iv. R -horizon d. Less humus and more minerals, compact

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.

Q. At low temperature water absorption decreases due to
(I) An increase in the viscosity of water and protoplasm.
(II) A decrease in the permeability of cell membranes.
(III) A decrease in the metabolic activities of root cells.
(IV) A check in the growth and elongation of roots.

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