Q BankQuestion BankDocsDocuments

B2.3.10 (HL)—Gamete adaptations

Gametes are specialized reproductive cells whose structures support fertilization, including sperm motility and oocyte protection, stored resources, and recognition layers.

Syllabus
First assessment 2025
Objective
B2.3.10
Level
HL

Exam analysis

Chance of appearing3%of analysed past papers
Latest appearanceNovember 2021
Most common paperPaper1
Typical marks1–5

Common command terms

  • Identify
  • Draw

Scoring notes

Common mistake
Placing most sperm mitochondria in the head or tail instead of the mid-piece.

Recent exam appearances

November 2021Paper1 ["HL"] · TZ040[ 1 ]B2.3.10 (HL)—Gamete adaptations
November 2015Paper2 ["HL"] · TZ05(a)[ 5 ]B2.3.10 (HL)—Gamete adaptations
May 2014Paper1 ["HL"] · TZ239[ 1 ]B2.3.10 (HL)—Gamete adaptations
Practice this objective

Coverage 2014–2021 · Updated 15 Jul 2026

Concept essentials

  • Sperm mitochondria are concentrated in the mid-piece to support ATP production.
  • The sperm flagellum enables motility toward the oocyte.
  • The mature egg has abundant cytoplasm and protective external layers.
  • The zona pellucida and cortical granules are important oocyte-associated structures.
ConceptIB Biology HL