Consider the following statements regarding the transmission of Tuberculosis (TB): 1. It is caused by bacteria. 2. It is transmitted through water. 3. The patient should be kept in complete isolation. Which of the statements given above is/are correct?

The correct option is (c). Explanation Tuberculosis (TB) is a highly infectious disease that primarily affects the lungs. Understanding its causative agent and mode of transmission is essential for disease control and prevention. Statement-wise Analysis: - Statement 1 is Correct: Tuberculosis is caused by a bacterium known as Mycobacterium tuberculosis. It is not a viral or fungal infection. - Statement 2 is Incorrect: TB is an airborne disease, not a waterborne disease. It spreads through the air when a person with active TB of the lungs or throat coughs, sneezes, or talks, releasing droplet nuclei. Waterborne diseases typically include Cholera and Typhoid. - Statement 3 is Correct: Since TB is transmitted via air droplets, isolating the patient is a critical measure to prevent the spread of the bacteria to healthy individuals, especially in the early, highly infectious stages of the disease. Key Takeaway: Tuberculosis is an airborne bacterial disease caused by Mycobacterium tuberculosis, requiring respiratory isolation to prevent transmission.

NCERT Class 8 Science — Chapter 2: Microorganisms : friend and foe

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Consider the following statements regarding the transmission of Tuberculosis (TB):

It is caused by bacteria.
It is transmitted through water.
The patient should be kept in complete isolation.

Which of the statements given above is/are correct?

Official previous-year question

Verified 1 Aug 2026.

Options

A1 and 2 only
B2 only
C1 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is (c).

Explanation

Tuberculosis (TB) is a highly infectious disease that primarily affects the lungs. Understanding its causative agent and mode of transmission is essential for disease control and prevention.

Statement-wise Analysis:

Statement 1 is Correct: Tuberculosis is caused by a bacterium known as Mycobacterium tuberculosis. It is not a viral or fungal infection.
Statement 2 is Incorrect: TB is an airborne disease, not a waterborne disease. It spreads through the air when a person with active TB of the lungs or throat coughs, sneezes, or talks, releasing droplet nuclei. Waterborne diseases typically include Cholera and Typhoid.
Statement 3 is Correct: Since TB is transmitted via air droplets, isolating the patient is a critical measure to prevent the spread of the bacteria to healthy individuals, especially in the early, highly infectious stages of the disease.

Key Takeaway: Tuberculosis is an airborne bacterial disease caused by Mycobacterium tuberculosis, requiring respiratory isolation to prevent transmission.

Your note

More from Chapter 2: Microorganisms : friend and foe

With reference to microorganisms, consider the following statements: 1. They are classified into four major groups: bacteria, fungi, protozoa, and algae. 2. They can survive only in moderate climates and die in ice-cold or hot spring environments. 3. Some microorganisms are unicellular, while others are multicellular. Which of the statements given above is/are correct?

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Which one of the following characteristics distinguishes viruses from other microorganisms?

easy

Consider the following statements regarding the habitat of microorganisms: 1. They are found in air, water, and soil but not inside the bodies of animals. 2. They can exist freely as well as grow on other organisms. 3. They are capable of surviving in deserts and marshy lands. Which of the statements given above is/are correct?

medium

Which one of the following human diseases is caused by a protozoan pathogen?

easy

Consider the following pairs of microorganisms and their classification: 1. Aspergillus : Algae 2. Paramecium : Protozoa 3. Penicillium : Fungi 4. Spirogyra : Bacteria How many of the above pairs are correctly matched?

hard

Keep practising Chapter 2: Microorganisms : friend and foe

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The correct option is (c).

Explanation

Tuberculosis (TB) is a highly infectious disease that primarily affects the lungs. Understanding its causative agent and mode of transmission is essential for disease control and prevention.

Statement-wise Analysis:

Statement 1 is Correct: Tuberculosis is caused by a bacterium known as Mycobacterium tuberculosis. It is not a viral or fungal infection.
Statement 2 is Incorrect: TB is an airborne disease, not a waterborne disease. It spreads through the air when a person with active TB of the lungs or throat coughs, sneezes, or talks, releasing droplet nuclei. Waterborne diseases typically include Cholera and Typhoid.
Statement 3 is Correct: Since TB is transmitted via air droplets, isolating the patient is a critical measure to prevent the spread of the bacteria to healthy individuals, especially in the early, highly infectious stages of the disease.

Key Takeaway: Tuberculosis is an airborne bacterial disease caused by Mycobacterium tuberculosis, requiring respiratory isolation to prevent transmission.