Which of the following hormone is not secreted by placenta ?

The correct answer is Option (3) → Relaxin

Option (1) Estrogens — Secreted by the placenta. The placenta acts as an endocrine tissue and makes estrogens.

Option (2) Progestogens — Secreted by the placenta. They keep the endometrium for the growing foetus.

Option (3) Relaxin — Not secreted by the placenta. Relaxin appears late in pregnancy but comes from the ovary.

Option (4) Human chorionic gonadotropin — Secreted by the placenta. hCG maintains the pregnancy in its early weeks.

Note: A similar question was also asked in CUET (UG) 2025 on 03-06-2025 (Slot 2).

NCERT Extract:
Pregnancy and Embryonic Development – “… The placenta facilitate the supply of oxygen and nutrients to the embryo and also removal of carbon dioxide and excretory/waste materials produced by the embryo. The placenta is connected to the embryo through an umbilical cord which helps in the transport of substances to and from the embryo. Placenta also acts as an endocrine tissue and produces several hormones like human chorionic gonadotropin (hCG), human placental lactogen (hPL), estrogens, progestogens, etc. In the later phase of pregnancy, a hormone called relaxin is also secreted by the ovary.”