Grade 12 Biology: Diseases
This worksheet covers various aspects of human diseases, including infectious agents, immune responses, and disease prevention.
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Grade 12 Biology: Diseases
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Read each question carefully and provide your best answer. For multiple-choice questions, circle the letter corresponding to the correct answer.
1. Which of the following is NOT a characteristic of a virus?
Contains genetic material (DNA or RNA)
Can reproduce independently
Has a protein coat (capsid)
Requires a host cell to replicate
2. The primary role of B lymphocytes in the immune response is to:
Phagocytose pathogens
Produce antibodies
Directly kill infected cells
Present antigens to T cells
3. A disease that is constantly present in a population at a low level is called an disease.
4. The process by which a weakened or inactive form of a pathogen is introduced into the body to stimulate an immune response is known as .
5. is a type of immunity acquired by receiving antibodies from another source, such as a mother to her child through breast milk.
6. Antibiotics are effective against viral infections.
True
False
7. Distinguish between innate and adaptive immunity. Provide an example of each.
8. Describe two ways in which infectious diseases can be transmitted.
9. Label the main components of the human immune system shown in the diagram below.
A:
B:
C:
D:
Match the disease with its causative agent.
10. Influenza
a. Protozoan
11. Malaria
b. Bacterium
12. Tuberculosis
c. Virus