Question
What happens when a child is vaccinated against tuberculosis?
Answer/Explanation
Ans
B
Question
The body has defenses to protect itself from diseases.
What is a mechanical barrier to diseases?
A hairs in the nose
B plasma
C stomach acid
D white blood cells
Answer/Explanation
Ans
A
Question
The antibodies that give immunity to a disease can be acquired in the following different ways.
1 feeding on breast milk
2 infection by disease
3 vaccination
Which give active immunity?
A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3
Answer/Explanation
Ans: C
Question
What is a correct statement about lymphocytes?
A Lymphocytes engulf pathogens.
B Lymphocyte numbers can be reduced when a person is infected with HIV.
C Lymphocytes produce antigens.
D Lymphocytes transport oxygen to different parts of the body.
Answer/Explanation
Ans: B