Worksheet Chapter 4: Human Health

1. Fill in the blank: Microorganisms that cause infectious diseases are generally known as ________.

2. Explain TWO vector control measures to curb the spread of Dengue fever in residential neighborhoods.

3. A village experiences a sudden outbreak of Cholera. (a) Identify the transmission medium and primary vector involved. (b) Suggest TWO immediate public health steps to contain the outbreak.

4. Which of the following diseases is transmitted by the Aedes mosquito vector?

5. True or False: Passive immunity provides instant protection but lasts for a shorter duration compared to active immunity.

6. Briefly describe how phagocytosis works in the second line of body defence.

7. True or False: Injections of antiserum contain dead pathogens used to stimulate the body's lymphocytes to synthesize antibodies.

8. Compare and contrast Natural Active Immunity and Artificial Passive Immunity in terms of: (a) Source of antibodies, (b) Speed of protection, and (c) Duration of protection.

9. State TWO differences between infectious diseases and non-infectious diseases.

10. A person receives a vaccine injection for Hepatitis B. (a) Name the type of immunity acquired. (b) Explain why a second booster shot is often required.