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Movement of Water in Plants

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Question

According to carbonic acid exchange theory of mineral salt absorption by roots, which of the following is incorrect?

A

C O_{2}

released by the respiration of roots combines with soil

H_{2} O

to form

H_{2} C O_{3}

.

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B

H_{2} C O_{3}

.dissociates into

H^{+}

and HCO^-_3$ ions in soil solution.

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C

H^{+}

ions may be exchanged for cations adsorbed on clay particles.

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D

Cations thus released into soil solution are adsorbed on roots cells in exchange for anions.

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Solution

The correct option is D Cations thus released into soil solution are adsorbed on roots cells in exchange for anions.
Carbonic acid echange theory: According to this theory, the CO $_{2}$ released during respiration of root cells combine with water to form carbonic acid (H $_{2}$ CO $_{3}$ ). Carbonic acid dissociates into H $^{+}$ and an an anion HCO $_{3}^{-}$ in soil solution. These H $^{+}$ ions may be exchanges for cations adsorbed on clay particles.
The cations thus released into the soil solution from the clay particles, may be adsorbed on root cells in exchange for H $^{+}$ or as ion pairs with bicarbonate. Thus, soil solution plays an important role in carbonic acid exchange theory.
So, the correct answer is 'Cations thus released into soil solution are adsorbed on root cells in exchange for anions.'

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Similar questions

Q. Choose the right sequential phenomena among the following during the delivery of

O_{2}

from blood tissue.
P : Absorption of

C O_{2}

by the blood.
Q : Reaction of absorbed

C O_{2}

H_{2} O

H_{2} C O_{3}

within RBC and its conversion into

H^{+}

H C O_{3}^{-}

ions in the presence of carbonic anhydrase enzyme.
R : Reaction of absorbed

C O_{2}

H_{2} O

in plasma to form

H_{2} C O_{3}

and its conversion into

H^{+}

H C O_{3}^{-}

ions in the presence of carbonic anhydrase enzyme.
S : Combination of

H^{+}

with heme portion of

H b O_{2}

O_{2}

.
T : Combination of

H C O_{3}^{-}

with heme portion

H b O_{2}

to form reduced hemoglobin and release of

O_{2}

.

Q. Short answer type questions.
Describe the carbonic acid exchange theory for absorption of mineral salts by plants

Choose the right sequential phenomena among the following during the delivery of

O_{2}

from blood to tissue.

P: Absorption of

C O_{2}

Q: Reaction of absorbed

C O_{2}

H_{2} O

H_{2} C O_{3}

within RBC and its conversion into

H^{+}

H C O_{3}^{-}

R: Reaction of absorbed

C O_{2}

H_{2} O

in plasma to form

H_{2} C O_{3}

and its conversion into

H^{+}

H C O_{3}^{-}

S: Combination of

H^{+}

with heme portion of

H b O_{2}

O_{2}

T: Combination of

H C O_{3}^{-}

with heme portion of

H b O_{2}

to form reduced hemoglobin and release of

O_{2}

Absorption of minerals by the epidermal cells of root and root hair causes the water to enter from surrounding soil into roots. It further reaches the root xylem. Thus, due to a continuous uptake of water by root cells, a water pressure is created in the root xylem. This pressure is called as________

Q. The theory of transfer of ions from soil to root without passing into solution was given by

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