IB Biology HL 2.3.11 Water potential in plant tissue Question Bank

Practise IB Biology HL 2.3.11 by applying water potential in plant tissue concepts to exam-style questions.

Exam points

identify the relevant biological structure, process or evidence
apply the correct biological mechanism to the question
evaluate the result using data, adaptation or ecological reasoning

[Maximum number: 3]

(a) Explain how the pressure potential and solute potential change inside a plant root cell when it is placed into a solution that is more hypotonic than the cell's cytoplasm.

Explain how the pressure potential and solute potential change inside a plant root cell when it is placed into a solution that is more hypotonic than the cell's cytoplasm.

a. (when cell is placed in a hypotonic solution) surrounding/outside (of the root hair cell) is more dilute / has higher water potential

OR

water will enter the root hair cell

OR

water moves from high water potential to low water potential;

b. (positive) pressure potential will increase / become more positive;

c. (negative) solute/osmotic potential will increase / become less negative;

d. water potential inside the cell will increase / become less negative;

e. $\Psi_{w}=\Psi_{s}+\Psi_{p}$ ;

f. when cell's water potential equals that of the solution, (net) water movement stops;

For e. allow word equation:

$\Psi_{w}=$ water potential

$\Psi_{s}=$ solute potential

$\Psi_{p}=$ pressure potential

3

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D2.3.11 (HL)—Water potential in plant tissue question 1