Human Health and Disease Practice Questions

Class 12 · Biology · 2975 free MCQs with instant results and detailed explanations.

2975

Total

921

Easy

1469

Medium

585

Hard

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Topics in Human Health and Disease

Drugs and Alcohol Abuse 578

Cancer 608

AIDS 584

Immunity 608

Common Diseases 597

Sample Questions from Human Health and Disease

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Easy

What is the primary mode of transmission for HIV?

A. Airborne

B. Vector-borne

C. Sexual contact

D. Contaminated water

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Correct Answer: C

HIV is primarily transmitted through sexual contact, not through air, vectors, or water.

Easy

Which of the following is a common symptom of diabetes?

A. Fever

B. Increased thirst

C. Nausea

D. Joint pain

Show Answer & Explanation

Correct Answer: B

Increased thirst is a common symptom of diabetes due to high blood sugar levels.

Easy

Which of the following diseases is characterized by a decrease in the number of red blood cells?

A. Anemia

B. Leukemia

C. Asthma

D. Hepatitis

Show Answer & Explanation

Correct Answer: A

Anemia is defined by a decrease in red blood cells, while leukemia involves white blood cells.

Medium

Which of the following is NOT a viral disease?

A. HIV

B. Hepatitis B

C. Tuberculosis

D. Influenza

Show Answer & Explanation

Correct Answer: C

Tuberculosis is caused by bacteria, not viruses, making it the correct choice.

Medium

What is the primary mode of transmission for the malaria parasite?

A. Airborne

B. Vector-borne

C. Contaminated water

D. Direct contact

Show Answer & Explanation

Correct Answer: B

Malaria is transmitted through the bite of infected female Anopheles mosquitoes, making it vector-borne.

Medium

Which type of immunity is developed after vaccination?

A. Innate immunity

B. Adaptive immunity

C. Passive immunity

D. Natural immunity

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Correct Answer: B

Vaccination stimulates the body's adaptive immune response, creating long-lasting immunity.

Medium

Which bacterium is primarily responsible for causing tuberculosis?

A. Streptococcus pneumoniae

B. Mycobacterium tuberculosis

C. Escherichia coli

D. Salmonella enterica

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Correct Answer: B

Mycobacterium tuberculosis is the causative agent of tuberculosis, a serious infectious disease.

Hard

Which of the following is a characteristic of autoimmune diseases?

A. Attack on self-antigens

B. Caused by viral infections

C. Always hereditary

D. Limited to adults

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Correct Answer: A

Autoimmune diseases occur when the immune system mistakenly attacks the body's own cells, recognizing them as foreign.

Hard

What is the primary pathogen responsible for causing malaria?

A. Plasmodium falciparum

B. Anopheles gambiae

C. Leishmania donovani

D. Entamoeba histolytica

Show Answer & Explanation

Correct Answer: A

Malaria is primarily caused by the Plasmodium parasite, with Plasmodium falciparum being the most severe form.

Q10

Hard

Which symptom is NOT typically associated with tuberculosis?

A. Chronic cough

B. Night sweats

C. High blood pressure

D. Weight loss

Show Answer & Explanation

Correct Answer: C

High blood pressure is not a typical symptom of tuberculosis, which is more commonly associated with cough, fever, and weight loss.

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Human Health and Disease — Class 12 Biology Practice Questions Online

This page contains 2975 practice MCQs for the chapter Human Health and Disease in Class 12 Biology. The questions are organized by difficulty — 921 easy, 1469 medium, 585 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 5 topics, giving you comprehensive coverage of the entire chapter.