Vidaara.orgClass 12 · Mathematics
CodeVID-M12-WS
Human Health and Disease — Practice Worksheet
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Choose the correct option (A, B, C or D) for each question.
- The answer key is at the end — try the paper first!
Section A — Multiple Choice (1 mark each)
16 × 1 = 16 marks
1.
Health is best defined as:
- A.Only the absence of disease
- B.Complete physical, mental and social well-being
- C.Being rich
- D.Eating a lot
2.
Diseases spread from person to person by germs are:
- A.Non-infectious
- B.Infectious
- C.Genetic
- D.Deficiency
3.
Tuberculosis and typhoid are caused by:
- A.Bacteria
- B.Viruses
- C.Worms
- D.Fungi
4.
Which disease is caused by a virus?
- A.Malaria
- B.Cholera
- C.Dengue
- D.Ringworm
5.
Malaria is spread by the:
- A.Housefly
- B.Female Anopheles mosquito
- C.Cockroach
- D.Rat
6.
Immunity present from birth and non-specific is:
- A.Innate immunity
- B.Acquired immunity
- C.Passive immunity
- D.No immunity
7.
Proteins that bind specific antigens are:
- A.Hormones
- B.Antibodies
- C.Enzymes
- D.Vitamins
8.
A vaccine contains a weakened or killed germ that triggers:
- A.Disease
- B.Antibodies and memory cells
- C.More germs
- D.Digestion
9.
Which disease has been completely eradicated by vaccination?
- A.Smallpox
- B.Malaria
- C.AIDS
- D.Cancer
10.
Giving ready-made antibodies (e.g. anti-venom) provides:
- A.Active immunity
- B.Passive immunity
- C.Innate immunity
- D.No immunity
11.
AIDS is caused by:
- A.A bacterium
- B.The HIV virus
- C.A protozoan
- D.A worm
12.
HIV does NOT spread through:
- A.Unprotected sex
- B.Shared needles
- C.Casual contact like a handshake
- D.Infected blood
13.
Uncontrolled division of cells forming a mass is a:
- A.Tumour
- B.Vaccine
- C.Antibody
- D.Vector
14.
Cancer-causing agents are called:
- A.Antigens
- B.Carcinogens
- C.Antibodies
- D.Vaccines
15.
A good way to prevent drug abuse is to:
- A.Give in to peer pressure
- B.Avoid peer pressure and seek support
- C.Hide problems
- D.Stop studying
16.
Chikungunya, like dengue, is a viral disease spread by:
- A.Mosquitoes
- B.Houseflies
- C.Rats
- D.Cattle
Section B — Challenge / Olympiad (2 marks each)
6 × 2 = 12 marks
17.
Draining stagnant water and using mosquito nets fights malaria mainly by:
- A.Controlling the vector (mosquito)
- B.Killing Plasmodium directly in soil
- C.Boosting antibodies
- D.Making a vaccine
18.
A second infection by the same germ is often milder because acquired immunity has:
- A.Memory cells that respond faster
- B.No effect
- C.More germs
- D.Removed the skin
19.
Vaccination protects a whole community partly through herd immunity, which means:
- A.When most people are immune, the germ spreads less to everyone
- B.Animals get vaccinated
- C.No one needs vaccines
- D.The germ grows faster
20.
AIDS makes a person prone to many other infections because HIV:
- A.Destroys immune cells that fight infection
- B.Strengthens immunity
- C.Adds antibodies
- D.Makes vaccines
21.
Quitting tobacco reduces cancer risk because tobacco smoke contains:
- A.Carcinogens that damage cells
- B.Antibodies
- C.Vaccines
- D.Vitamins
22.
Early detection (screening) improves cancer survival mainly because it allows treatment before the tumour:
- A.Spreads (metastasises) to other organs
- B.Becomes an antibody
- C.Turns into a vaccine
- D.Disappears on its own
Answer Key
Section A — Multiple Choice (1 mark each)
- (B) Complete physical, mental and social well-being
- (B) Infectious
- (A) Bacteria
- (C) Dengue
- (B) Female Anopheles mosquito
- (A) Innate immunity
- (B) Antibodies
- (B) Antibodies and memory cells
- (A) Smallpox
- (B) Passive immunity
- (B) The HIV virus
- (C) Casual contact like a handshake
- (A) Tumour
- (B) Carcinogens
- (B) Avoid peer pressure and seek support
- (A) Mosquitoes
Section B — Challenge / Olympiad (2 marks each)
- (A) Controlling the vector (mosquito)
- (A) Memory cells that respond faster
- (A) When most people are immune, the germ spreads less to everyone
- (A) Destroys immune cells that fight infection
- (A) Carcinogens that damage cells
- (A) Spreads (metastasises) to other organs
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