IB Biology HL C1.3.11 Hl Photolysis of Water Questions

Practise IB Biology HL 1.3.11 by applying photolysis of water concepts to exam questions.

Exam points

Explain how PSII uses light energy to split water, supplying replacement electrons and hydrogen ions while releasing oxygen.
Relate photolysis products to electron replacement, proton accumulation and oxygen evolution in the light-dependent reactions.

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Study C1.3.11 (HL)—Photolysis of water conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

[Maximum number: 3]

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

Explain how water is used in photosynthesis.

a

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

producing/providing electrons

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

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

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

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IB Biology HL C1.3.11 Hl Photolysis of Water Questions question 1