ICAR-AIEEA-JRF Practice Quiz

Question 1

Which component of water potential is primarily responsible for the upward movement of water in xylem during transpiration under normal conditions?

Accepted Answer

Negative pressure potential created by transpiration pull

Question 2

A plant cell has solute potential (Ψs) = -0.8 MPa and pressure potential (Ψp) = +0.3 MPa. Its water potential is:

Accepted Answer

-0.5 MPa

Question 3

In a pressure chamber (pressure bomb) experiment, the balancing pressure required to force xylem sap back to the cut surface of a transpiring twig primarily estimates:

Accepted Answer

Magnitude of xylem tension before excision

Question 4

Which of the following best explains cavitation in xylem vessels?

Accepted Answer

Formation of air bubbles that break the continuous water column under high tension

Question 5

A fully turgid plant cell is transferred from pure water to a sucrose solution whose water potential is equal to the cell sap water potential at incipient plasmolysis. What will happen to the cell after equilibrium is reached?

Accepted Answer

It will become flaccid with zero pressure potential

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