Water Potential in Mature Cells Quiz
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Questions and Answers

What is the function of the tonoplast in a cell?

  • Provides structural support to the plasma membrane
  • Helps in cell division by forming the cell plate
  • Synthesizes proteins for cell growth
  • Regulates the movement of water and solutes in and out of the vacuole (correct)

Placing water under tension in a plant cell would have what effect on the water potential?

  • Increases the water potential
  • Reduces the water potential (correct)
  • Increases free energy
  • Has no effect on water potential

What is the main function of the cytoplasm in a cell?

  • Contains organelles like mitochondria and ribosomes (correct)
  • Stores water and nutrients for the cell
  • Acts as a barrier to protect the nucleus
  • Regulates cell growth and division

How does adding solutes to a solution affect the water potential?

<p>Decreases free energy and increases water potential (C)</p> Signup and view all the answers

Which part of a plant cell acts as a selective barrier regulating the movement of substances into and out of the cell?

<p>Tonoplast (A)</p> Signup and view all the answers

Placing a flaccid cell in a weak sucrose solution would most likely result in what movement of water?

<p>No movement of water into or out of the cell (C)</p> Signup and view all the answers

What is the relationship between hydrostatic pressure, solute potential, and water potential in a plant cell?

<p>Hydrostatic pressure is positive, solute potential is negative, and water potential is the sum of the two (C)</p> Signup and view all the answers

How does wilting affect turgor pressure in plant cells?

<p>Turgor pressure decreases as cells dry out and lose access to water (D)</p> Signup and view all the answers

What causes the process of plasmolysis in plant cells?

<p>Severe dehydration or wilting (A)</p> Signup and view all the answers

How does the disequilibrium in water potential affect cell volume?

<p>It drives water entry into the cell, increasing cell volume by stretching the wall (B)</p> Signup and view all the answers

What role does turgor pressure play in cell wall expansion?

<p>Turgor pressure creates a stress that loosens the cell wall for expansion (B)</p> Signup and view all the answers

What process must occur to fully restore turgor pressure in a plant cell after expansion?

<p>Increasing solute intake into the cell (A)</p> Signup and view all the answers

What is the term for the pressure exerted by water inside the vacuole of a plant cell?

<p>Turgor pressure (A)</p> Signup and view all the answers

Which component of a plant cell is primarily responsible for maintaining turgor pressure?

<p>Tonoplast (D)</p> Signup and view all the answers

In plant cells, what is the primary function of the tonoplast?

<p>Controlling water balance in the vacuole (A)</p> Signup and view all the answers

Which structure in a plant cell is directly involved in the uptake and storage of water?

<p>Vacuole (D)</p> Signup and view all the answers

Among the listed components, which one acts as a selective barrier regulating the movement of substances in and out of a plant cell?

<p>Plasma membrane (B)</p> Signup and view all the answers

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