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Class 12 Human Health and Disease worksheet
CBSE Biology. Pathogens and how they spread, the Plasmodium life cycle, immunity, antibody counts, cancer, drugs. Every sheet has 20 questions in three sections and an answer key, and the numbers change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
Typhoid fever is confirmed by the:
- Western blot
- Mantoux test
- ELISA test
- Widal test
Answer
(d) Widal test
- 2.
Which disease is caused by the protozoan Plasmodium (P. vivax, P. malariae, P. falciparum)?
- Malaria
- AIDS
- Chikungunya
- Ringworm
Answer
(a) Malaria
- 3.
Malaria usually spreads through:
- sexual contact, transfusion of infected blood, shared needles, or from mother to child
- contaminated food and water
- the bite of an infected female Anopheles mosquito
- droplets from an infected person, or sharing glasses and utensils
Answer
(c) the bite of an infected female Anopheles mosquito
Section B · short answer
- 4.
What is meant by health?
Answer
Health is a state of complete physical, mental and social well-being, not merely the absence of disease.
- 5.
Name the pathogen of filariasis (elephantiasis) and of pneumonia, and say how each spreads.
Answer
filariasis (elephantiasis): the filarial worms Wuchereria bancrofti and W. malayi, through the bite of an infected female Culex mosquito; pneumonia: the bacteria Streptococcus pneumoniae and Haemophilus influenzae, through droplets from an infected person, or sharing glasses and utensils
Section C · long answer
- 6.
Describe the life cycle of Plasmodium.
Answer
Sporozoites enter the human with the bite of an infected female Anopheles. They multiply asexually in liver cells and then in red blood cells, which burst and release haemozoin, causing chill and high fever every 3–4 days. Some parasites form gametocytes in the red blood cells. A female Anopheles takes these up with blood; fertilisation and development occur in its gut, and the sporozoites formed move to its salivary glands, ready to infect the next human.
Fresh sheets for your child
In the app, every Human Health and Disease sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
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