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C1.3.13 (HL)—NADP reduction

NADP is reduced in the light-dependent reactions when electrons from Photosystem I are accepted to form reduced NADP, connecting the mechanism to observable photosynthesis evidence.

Syllabus
First assessment 2025
Objective
C1.3.13
Level
HL

Exam analysis

Chance of appearing4%of analysed past papers
Latest appearanceMay 2025
Most common paperPaper1
Typical marks1

Recent exam appearances

May 2025Paper1A ["HL"] · TZ27[ 1 ]C1.3.13 (HL)—NADP reduction
May 2021Paper1 ["HL"] · TZ132[ 1 ]C1.3.13 (HL)—NADP reduction
May 2018Paper1 ["HL"] · TZ215[ 1 ]C1.3.13 (HL)—NADP reduction
May 2017Paper1 ["HL"] · TZ215[ 1 ]C1.3.13 (HL)—NADP reduction
Practice this objective

Coverage 2017–2025 · Updated 15 Jul 2026

Concept essentials

  • Photosystem I supplies electrons used to reduce NADP.
  • NADP, not NAD or FAD, is the photosynthetic electron acceptor.
  • Reduced NADP carries reducing power to the Calvin cycle.
  • NADP reduction belongs to the light-dependent reaction sequence.
ConceptIB Biology HL