What important role does the Casparian strip play in the movement of water through plants?
a. Forces water to move through the cytoplasm of living endodermal cells as it makes its way from the soil to the xylem
b. Causes cells to shrink, thereby increasing pressure within cells
c. Loads sugars into xylem, thereby causing water to enter the xylem by osmosis
d. Acts as a filter that prevents salts, heavy metals, and other pollutants from entering root hairs

Question

What important role does the Casparian strip play in the movement of water through plants?

a. Forces water to move through the cytoplasm of living endodermal cells as it makes its way from the soil to the xylem

b. Causes cells to shrink, thereby increasing pressure within cells

c. Loads sugars into xylem, thereby causing water to enter the xylem by osmosis

d. Acts as a filter that prevents salts, heavy metals, and other pollutants from entering root hairs

Accepted Answer

Welcome back. Let's look at our next question. It says blank forced water to move through the cytoplasm of living endo dermal cells as it makes its way from the soil to the asylum. Well, let's focus in on this phrase. Move through the cytoplasm And let's recall from our content video. Now there's two ways that things flow. Things flow through plant tissue. There is a pop plastic flow which you can we can recall means flow outside the cell walls of the plant. And things can also move by sim plastic flow when they move through the cytoplasm of the cells. So we can see that we're talking about sim plastic flow here because we're saying, what is it that forces water to move through the cytoplasm So restricts apple plastic flow outside the cell walls. Well, in that case we're looking at the choice C cas Berrien strips and the cast korean strips are sort of this band, a band like thickening that forms an impervious barrier. I should say, water impervious barrier between the cortex and the steely, steely being the center of a plant root or stem. Remember that's the and it's the inner layer of the cortex is the endo dermis. So the experience trip is a band like thickening in the center of that, the root end Hermes, it's impervious to water and this allows it to prevent apple plastic flow to the stealing it forces the water and inorganic salts coming from the soil to travel by sim plastic flow through the cytoplasm. So we're looking at the Gasparri in strips. Let's just look at our other answer choices to understand why they're not correct choice A says plasma does Mata while the plasma does Mata are the little little channels, the little pores between plant cells. And that's what allows sim plastic flow. So that's the openings between cells that allows flow through the side of possum. So that's part of some plastic flow. But that isn't what forces water coming in the route to flow by the same plastic flow. So choice. It is not our answer choice. B. R vacuum. Als Vac U Als are those fluid filled vessels in inside are fluid filled organelles inside plant cells. They're very large and they maintain the pressure of the plant cell. But that's not what we're looking for here. And choice. The Asylum vessels. While the xylem vessels are where these water and and inorganic salts are going. But it's not what forces the water to move through the cytoplasm. So, that's not an answer. So, again, what forces water to move through the cytoplasm as it makes its way from soil to the asylum. That's the Casper Aryan strips choice. See they're impervious to water. So water can't get through to that apple plastic flow. It has to go through the cytoplasm by sim plastic flow. See you in the next video

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Key Concepts

Casparian Strip

Endodermis

Water Movement in Plants