IB Biology HL 3.1.18 Placenta role Question Bank
Practise IB Biology HL 3.1.18 by applying placenta role concepts to exam-style questions.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- identify the relevant biological structure, process or evidence
- apply the correct biological mechanism to the question
- evaluate the result using data, adaptation or ecological reasoning
D3.1.18 (HL)—Placenta role question 1
[Maximum number: 8]
Explain how the structure and functions of the placenta maintain pregnancy.
a. transport facilitated by proximity of mother and embryo blood vessel;
b. chorionic villi increase surface area for exchange;
c. oxygen and food reach embryo;
d. carbon dioxide and waste matter carried from embryo to mother;
e. immune system of mother protects embryo;
f. barrier function as bloods do not mix;
g. endocrine function as it secretes hormones;
h. human chorionic gonadotropin/HCG prevents degeneration of corpus luteum;
i. production of estrogen maintains endometrium; j. estrogen increases mammary gland growth; k. progesterone maintains endometrium;
1. progesterone prevents uterine contractions;
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