D3.1.16 (HL)—Blastocyst and implantation
A blastocyst is an early embryo that has developed into a hollow ball of cells before implantation in the uterine lining.
- Syllabus
- First assessment 2025
- Objective
- D3.1.16
- Level
- HL
Exam analysis
Chance of appearing1%of analysed past papers
Latest appearanceMay 2012
Most common paperPaper1
Typical marks1
Common command terms
- Identify
Recent exam appearances
May 2012Paper1 ["HL"] · TZ140[ 1 ]D3.1.16 (HL)—Blastocyst and implantation
Practice this objective
Coverage 2012–2012 · Updated 16 Jul 2026
Concept essentials
- A blastocyst is an embryo, not an unfertilized egg.
- The blastocyst is a hollow ball of cells.
- Blastocyst formation occurs before implantation in the uterus.