- Hormone: Estrogen.
- Source organ: Ovaries (specifically, developing follicles).
- Function: Estrogen plays a crucial role in rebuilding and thickening the endometrium (uterine lining) after menstruation, thereby preparing the uterus for possible embryo implantation.
Match List I with List II:

Choose the correct answer from the options given below:
(a) Why do the symptoms of malaria not appear in a person immediately after being bitten by an infected female Anopheles? Give one reason. Explain when and how do the symptoms of the disease would appear.