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NEET · Biology · Class 12

Human Health and Disease — NEET Biology MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

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10/14/6easy / medium / hard
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Sample questions from this chapter

A person is physically fit but socially isolated and severely distressed. Why does this not meet the biological definition of health?
  1. Health includes physical, mental and social well-being ✓
  2. Health is simply absence of infection
  3. Physical fitness overrides psychological state
  4. Social function is unrelated to physiology
Answer: A. Health is a complete state, not merely a disease-free body. Genetic factors, infection and lifestyle all interact with mental and social circumstances.
Why not B: Absence of infectious disease is only one component of well-being.
Why not C: Mental state can influence neural, endocrine and immune function.
Why not D: Social conditions affect behaviour, stress, care and overall health outcomes.
Virus-infected cells release proteins that make nearby uninfected cells more resistant to viral spread. Which innate barrier acted?
  1. Physical barrier of skin
  2. Physiological barrier of stomach acid
  3. Cytokine barrier formed by interferons ✓
  4. Humoral memory from IgG
Answer: C. Interferons signal an antiviral state in neighbouring cells, limiting replication and spread. They are cytokine barriers distinct from antibodies.
Why not A: The virus is already within tissue, beyond the external skin barrier.
Why not B: Gastric acidity acts against swallowed microbes.
Why not D: Interferon action is innate and non-antibody-mediated.
A mosquito bites a malaria patient and later transmits infection to another person. Which parasite sequence is essential?
  1. Human blood stages enter mosquito, develop into salivary-gland sporozoites, then enter the next human liver ✓
  2. Human liver releases adult worms into mosquito lymphatics
  3. Mosquito injects haemozoin, which becomes Plasmodium in RBCs
  4. Sporozoites remain in the mosquito gut, while a different blood-stage form enters saliva
Answer: A. The two-host cycle alternates sexual development in Anopheles with liver and RBC multiplication in humans. Breaking either host transition interrupts transmission.
Why not B: Plasmodium is a protozoan and does not form adult filarial worms.
Why not C: Haemozoin is a toxic parasite product, not the infectious organism.
Why not D: Sporozoites themselves migrate to salivary glands and are the stage injected during the next bite.

These are 3 of the 30 questions in the test. Take the full chapter test →

Read the chapter first

Every NCERT question in this chapter is solved, free: NCERT solutions — Human Health and Disease →

Other NEET Biology chapters

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Questions

How many NEET questions are there on Human Health and Disease?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 12 chapter.

Is this NEET Biology chapter test free?

Yes. Every chapter test is free with no login. The only paid thing on the site is the full-length 90-question Biology mock and its all-India rank.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.