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Ch. 37 - Soil and Plant Nutrition
All textbooksCampbell 12th EditionCh. 37 - Soil and Plant NutritionProblem 10
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Chapter 37, Problem 10

DRAW IT Draw a simple sketch of cation exchange, showing a root hair, a soil particle with anions, and a hydrogen ion displacing a mineral cation.

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Hello everyone. And in today's video we have the following problem. What happens to the ph of soil after a cat ion exchange? And this is referring to plants? And so let's be quickly reminded what a cat ion exchange is before we jump into solving this problem. So, according to the graphic that we have here, a cat ion exchange is a process that occurs in the roots of plants, where cat ions or nutrients inside of the plants are attracted to court excels and then they are expelled outside into the soil from the roots. So what's going to happen because of this is that the hydrogen ion concentration of the soil is going to increase. So let's be quickly reminded also of the effect of the hydrogen iron concentration into the ph And we have that the ph of any medium is equal to the negative log of the hydrogen ion concentration. So now this is very strange to visualize. So let's create an easier way that we can relate the two values we have that the hydrogen ion concentration of any medium is inversely related to the ph of that medium. So what this means is as this hydrogen ion concentration increases the ph of that medium is going to decrease. As we can see here, the hydrogen iron in the soil increases from this car ion exchange from the expulsion of these hydrogen ions from the roots. And so what's going to happen to the ph is that it's going to decrease, which correlates with answer choice A and that is our final answer. A decrease in the ph of the soil will take place from an increase in the presence of the hydrogen ion concentration, making that soil more aesthetic. So thank you very much for sticking around until the end of this video. I really hope it helped you.
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Textbook Question

The greatest difference in health between two groups of plants of the same species, one group with mycorrhizae and one group without mycorrhizae, would be in an environment a. where nitrogen-fixing bacteria are abundant. b. that has soil with poor drainage. c. that has hot summers and cold winters. d. in which the soil is relatively deficient in mineral nutrients.

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Textbook Question

Two groups of tomatoes were grown under laboratory conditions, one with humus added to the soil and one a control without humus. The leaves of the plants grown without humus were yellowish (less green) compared with those of the plants grown in humus-enriched soil. The best explanation is that a. the healthy plants used the food in the decomposing leaves of the humus for energy to make chlorophyll. b. the humus made the soil more loosely packed, so water penetrated more easily to the roots. c. the humus contained minerals such as magnesium and iron needed for the synthesis of chlorophyll. d. the heat released by the decomposing leaves of the humus caused more rapid growth and chlorophyll synthesis.

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Textbook Question

The specific relationship between a legume and its mutualistic Rhizobium strain probably depends on a. each legume having a chemical dialogue with a fungus. b. each Rhizobium strain having a form of nitrogenase that works only in the appropriate legume host. c. each legume being found where the soil has only the Rhizobium specific to that legume. d. specific recognition between chemical signals and signal receptors of the Rhizobium strain and legume species.

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