- A Forming a physical barrier directly over the narrow cervical opening
- B Chemically immobilising or killing sperm on contact
- C Altering cervical mucus consistency mainly to trap and slow down sperm
- D Lowering testosterone levels in males gradually over an extended period
Correct answer: B. Chemically immobilising or killing sperm on contact
Explanation: Spermicides contain chemicals like nonoxynol-9 that chemically immobilise or kill sperm by disrupting their cell membranes. They are most effective when used in combination with barrier methods like diaphragms.
Concept context
Understand reproductive health, family planning, contraception methods, STIs, population control, and assisted reproductive technologies.