IB Biology HL 1.3.11 Photolysis of water Question Bank

Practise IB Biology HL 1.3.11 by applying photolysis of water 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]

During photosynthesis plants use water in the conversion of light energy to chemical energy.

Explain how water is used in photosynthesis.

ii

а

water is split/broken «up»/lysed/undergoes photolysis

For mpa, reject "water is cut in half".

For mpa, accept photolysis only if the context shows that water is being split.

For mpc, do not accept just chlorophyll.

For mpe, reject pumping of protons into the thylakoid as photolysis produces them inside the thylakoid.

3 max

b

producing/providing electrons

c

replaces electrons lost by Photosystem II / PSII / P680 / chlorophyll a

d

allows electrons «to continue» to pass along the electron transport chain

e

provides protons/ $\mathrm{H}^{+}$ «inside thylakoid» to help generate a «proton» gradient/maintain high concentration inside thylakoid

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C1.3.11 (HL)—Photolysis of water question 1