Multiple choice

Which of the following statements is TRUE?

  1. Mucus is a germ killing secretion.

  2. Saliva is a germ trapping secretion.

  3. Vaccine induces antigen production.

  4. Strong heat and boiling also act as disinfectants.

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Strong heat and boiling also destroy the germs and may be called as physical disinfectants.