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C1.3.16 (HL)—Triose phosphate synthesis

Triose phosphate forms when glycerate phosphate is reduced using ATP and reduced NADP during the light-independent reactions, connecting the mechanism to observable photosynthesis evidence.

Syllabus
First assessment 2025
Objective
C1.3.16
Level
HL

Exam analysis

Chance of appearing2%of analysed past papers
Latest appearanceNovember 2022
Most common paperPaper1
Typical marks1

Recent exam appearances

November 2022Paper1 ["HL"] · TZ031[ 1 ]C1.3.16 (HL)—Triose phosphate synthesis
May 2018Paper1 ["HL"] · TZ131[ 1 ]C1.3.16 (HL)—Triose phosphate synthesis
Practice this objective

Coverage 2018–2022 · Updated 15 Jul 2026

Concept essentials

  • Glycerate 3-phosphate is reduced to triose phosphate in the Calvin cycle.
  • ATP supplies energy for triose phosphate synthesis.
  • Reduced NADP supplies reducing power for the reduction step.
  • Triose phosphate can contribute to carbohydrate synthesis or RuBP regeneration.
ConceptIB Biology HL