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Which of the options describe the movement of water through a plant and why? A- The Casparian Strip forces water to enter the cytoplasm before it can enter the xylem, B-water can move across the route by the apoplast pathway because of plasmodesmata between cells, C- water is drawn up by the xylem because of adhesion between water molecules, D- water move by osmosis from a low water potential to a high water potential. This question is from a level biology OCR A

Question

Which of the options describe the movement of water through a plant and why? A- The Casparian Strip forces water to enter the cytoplasm before it can enter the xylem, B-water can move across the route by the apoplast pathway because of plasmodesmata between cells, C- water is drawn up by the xylem because of adhesion between water molecules, D- water move by osmosis from a low water potential to a high water potential. This question is from a level biology OCR A

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Solution

The correct options that describe the movement of water through a plant are A and C.

A - The Casparian Strip is a band of cell wall material deposited in the radial and transverse walls of the endodermis, and is chemically different from the rest of the cell wall - the cell wall being made of lignin and suberin. It blocks the passive flow of materials into the xylem, forcing water and solutes to cross the plasma membrane, where they can be selectively taken up by the plant. This ensures that only beneficial substances are taken up by the plant.

C - Water is drawn up by the xylem due to a combination of adhesion and cohesion. Adhesion is the attraction of water molecules to the walls of the xylem vessels, while cohesion is the attraction between water molecules themselves. Together, they facilitate the movement of water up the plant against gravity in a process known as capillary action.

Option B is incorrect because the apoplast pathway involves the movement of water through the cell walls and intercellular spaces, not through plasmodesmata. Plasmodesmata are small channels that directly link the cytoplasm of neighboring plant cells to each other, permitting the transport of certain molecules.

Option D is also incorrect because osmosis is the movement of water from an area of high water potential to an area of low water potential, not the other way around.

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