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Ch. 35 - Water and Sugar Transport in Plants
All textbooksFreeman 8th EditionCh. 35 - Water and Sugar Transport in PlantsProblem 11
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Chapter 34, Problem 11

Atmospheric CO2 has been increasing rapidly since the late 1800s, largely due to human activities. Recall that CO2 enters leaves through stomata and can then be used for photosynthesis. However, transpiration occurs as a result of water evaporating through stomata. How have plants responded to elevated CO2 levels? Which of these structural features can help to limit water loss in plants that occupy dry habitats? a. abundant companion cells and sieve-tube elements b. stomata that are located in pits on the undersides of their leaves, or narrow, needlelike leaves c. extensive networks of xylem and phloem d. stomata that are located on the top surface of leaves, or broad leaves

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Hello everyone and welcome to today's video. So all of the following features help plants conserve water except remember that we're looking for the incorrect or the feature that does not help plants conserve water begin by answer choice. The reduction in the number of leaves. Remember that lives is where photosynthesis takes place. And for the sin disease requires water. So if we have less leaves, we're going to be performing less photosynthesis but we're also going to be using less water or conserving water. This is not the exception that we're looking for. So we're going to cancel it out. Then we have the presence of particles around leaves and stems. These chronicles are these waxy layers and these waxy layers. Their main function is to prevent water loss or to conserve water. So these are definitely going to help plants conserve water and they're not the exception that we're looking for. Then we have the suckling stems. These are specific type of stems are able to store more water. These are usually present in plants that are living in very dry environment. So these are going to hold the plants conserve more water and we're going to cancel this out. And then we have see a large number of sta mara on the upper side of leaves. I want you to remember that these Tamara are present in gas exchange. So the gasses come out and enter the plant through this Tamara. If we have this gas exchange occurring and H20 or water is present as a gas. If we have too many Samara, then the water or the geishas water is going to be able to escape the plant via DS Tamara. So this would not really help the plant conserve water, and it is going to be the exception that we're looking for. So we'll highlight it. That is the final answer to the question, and I really hope this video helped, too.
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Your friend claims that phloem always carries sugars down a plant. What, if anything, is wrong with that statement?

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Consider a tree that is 50 m tall and is transpiring roughly 90 liters of water each day. Approximately how many calories will the tree use to transpire this quantity of water?

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Textbook Question

Atmospheric CO2 has been increasing rapidly since the late 1800s, largely due to human activities. Recall that CO2 enters leaves through stomata and can then be used for photosynthesis. However, transpiration occurs as a result of water evaporating through stomata. How have plants responded to elevated CO2 levels? What impact, if any, do you predict elevated CO2 levels will have on the number of stomata in leaves, and on the transpiration rate?

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Textbook Question

Atmospheric CO2 has been increasing rapidly since the late 1800s, largely due to human activities. Recall that CO2 enters leaves through stomata and can then be used for photosynthesis. However, transpiration occurs as a result of water evaporating through stomata. How have plants responded to elevated CO2 levels? The amount of water that evaporates from stomata over a period of time is referred to as stomatal conductance, which is determined largely by the number of stomata in a given area of leaf surface. Researchers obtained specimens from preserved collections and measured stomatal conductance in leaves from oak trees and pine trees that grew at various times under different CO2 levels. The data are shown in the following graph. In general, is the maximum stomatal conductance rate in plants more or less than it was a century ago?

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Textbook Question

Atmospheric CO2 has been increasing rapidly since the late 1800s, largely due to human activities. Recall that CO2 enters leaves through stomata and can then be used for photosynthesis. However, transpiration occurs as a result of water evaporating through stomata. How have plants responded to elevated CO2 levels? One prediction of global climate change is that there will be an increase in periods of drought in some regions. Given the data just presented, will plants be more or less likely to survive periods of drought as they are exposed to rising CO2 levels?

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