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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Which of the following processes contributes to the uptake of mineral ions by plant roots?

a. chlorosis

b. osmosis

c. cation exchange

d. anion leaching

e. growth of root hairs

Summary Introduction

Introduction:

Plant nutrients are absorbed from the soil in the form of ions. The soil provides nitrogen, potassium, phosphorous, magnesium, calcium, sulfur, etc. in a relatively large amount known as macronutrients. The soil also provides manganese, iron, boron, copper, molybdenum, zinc, cobalt, chlorine, and others. These nutrients must be present in the appropriate ratios and quantities.

Explanation

Justification/explanation for the correct answer:

Option (c) states that the process of “cation exchange” is the method by which the roots acquire cations from the soil. Roots acquire the cations through a cation exchange mechanism, wherein a cation (often a proton) replaces a cation from the soil. The protons are formed from two major sources. The one major source is when respiring roots liberate carbon dioxide, which gets dissolved within the soil solution, producing carbonic acid. The other major source is subsequent chemical reactions ionize the carbonic acid to generate proton and bicarbonate ions. It is a crucial part of the uptake of mineral ions by plant roots. Hence, option (c) is correct.

Explanation for the incorrect answer:

Option (a) states that the word “chlorosis” represents the condition wherein the plant generates insufficient chlorophyll. Since chlorophyll accounts for the green color of the leaves, the chlorotic leaves are yellow or yellowish white in color. It is not related to the uptake of mineral ions by plant roots. So, it is an incorrect option.

Option (b) states that the word “osmosis” represents the spontaneous movement of the molecules of solvent, from the area of the higher solute level to the area of lower solute level through a semipermeable membrane. It takes place to normalize the solutes concentration on two sides of the membrane. It is not related to the uptake of mineral ions by plant roots...

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