Prepare for NEET Biology Transport in Plants with MCQs & PYQs on NEET.GUIDE. Access free practice, previous year questions, and expert guidance to understand xylem, phloem, and movement of water.
A plant cell with a water potential of -0.65 MPa is placed in a solution with a water potential of -0.30 MPa. Assuming the cell wall is rigid and fully permeable, and the cell membrane is selectively permeable, what will be the pressure potential of the cell at equilibrium?
-0.95 MPa
-0.35 MPa
+0.35 MPa
+0.95 MPa
Two identical plant cells are placed in separate solutions. Cell A is placed in a 1M sucrose solution, and Cell B is placed in a 1M NaCl solution. Which cell will experience greater plasmolysis, assuming ideal conditions and complete dissociation of NaCl?
Cell A
Cell B
Both cells will plasmolyze equally
Neither cell will plasmolyze
A researcher observes that a particular plant cell placed in a solution exhibits incipient plasmolysis. If the solute potential of the cell is -1.2 MPa, what is the MOST likely water potential of the surrounding solution?
-1.2 MPa
-1.0 MPa
-1.4 MPa
-0.8 MPa
Certain integral membrane proteins facilitate the diffusion of molecules across the membrane without directly binding to the transported molecule. These proteins create a continuous aqueous pathway through the lipid bilayer. Which of the following is the BEST example of such facilitated diffusion?
GLUT transporters moving glucose
Sodium-potassium pump maintaining ion gradients
Aquaporins transporting water
Chloride channels gated by voltage
A mutation in an aquaporin gene results in a non-functional protein. Which of the following cellular processes would be MOST directly affected?
Glucose uptake by muscle cells
Sodium transport across nerve cell membranes
Water reabsorption in the kidneys
Calcium storage in the sarcoplasmic reticulum
A plant cell is placed in a solution with a water potential of -0.8 MPa. The cell's initial solute potential is -1.2 MPa and its pressure potential is 0.4 MPa. After equilibration, which of the following statements about the cell's state is MOST accurate?
The cell will be turgid, with a pressure potential greater than 0.4 MPa.
The cell will be flaccid, with a pressure potential of zero.
The cell will be plasmolyzed, with a pressure potential of zero.
The cell will experience incipient plasmolysis, with a pressure potential slightly above zero.
Imagine a plant cell undergoing plasmolysis. If the external solution's water potential is further decreased, which of the following is the MOST likely consequence?
Deplasmolysis and return to a turgid state.
Incipient plasmolysis with the cell membrane just touching the cell wall.
No further change in the cell's state.
Increased plasmolysis with further shrinkage of the protoplast.
A plant cell with a water potential of -0.6 MPa is placed in a solution. After a period of time, the cell reaches equilibrium and is found to be plasmolyzed. Which of the following values could represent the water potential of the solution?
-0.4 MPa
-0.6 MPa
-0.8 MPa
-0.2 MPa
Which of the following factors DOES NOT significantly affect the rate of imbibition?
Temperature
Affinity of the imbibant for the liquid
Surface area of the imbibant
External hydrostatic pressure
Seeds of certain desert plants exhibit delayed germination due to the presence of inhibitors. How does imbibition contribute to overcoming this dormancy?
Imbibition increases the seed's internal temperature, denaturing the inhibitors.
Imbibition activates enzymes within the seed that break down the inhibitors.
Imbibition allows water to enter the seed and leach out the inhibitors, promoting germination.
Imbibition increases the seed's turgor pressure, rupturing the seed coat and releasing the inhibitors.
