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.

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Solution

Situation 'B' is advantageous for absorption of water and minerals. This is because A horizon is the top layer of soil and is rich in minerals and humus. It is called topsoil. The plant roots grow in topsoil. The roots of some of the trees are, however, able to reach B horizon (subsoil). The subsoil is rich in soluble minerals.

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

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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.

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.